GB2136224A - Vehicle electrical system - Google Patents

Vehicle electrical system Download PDF

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Publication number
GB2136224A
GB2136224A GB08305722A GB8305722A GB2136224A GB 2136224 A GB2136224 A GB 2136224A GB 08305722 A GB08305722 A GB 08305722A GB 8305722 A GB8305722 A GB 8305722A GB 2136224 A GB2136224 A GB 2136224A
Authority
GB
United Kingdom
Prior art keywords
battery
engine
loads
electrical system
vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB08305722A
Other versions
GB8305722D0 (en
Inventor
Hugh Russell White
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Motor Co
Original Assignee
Ford Motor Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ford Motor Co filed Critical Ford Motor Co
Priority to GB08305722A priority Critical patent/GB2136224A/en
Publication of GB8305722D0 publication Critical patent/GB8305722D0/en
Publication of GB2136224A publication Critical patent/GB2136224A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/10—Safety devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • H02J7/1423—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle with multiple batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N11/00—Starting of engines by means of electric motors
    • F02N11/08—Circuits or control means specially adapted for starting of engines
    • F02N11/0862—Circuits or control means specially adapted for starting of engines characterised by the electrical power supply means, e.g. battery
    • F02N11/0866—Circuits or control means specially adapted for starting of engines characterised by the electrical power supply means, e.g. battery comprising several power sources, e.g. battery and capacitor or two batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/46—The network being an on-board power network, i.e. within a vehicle for ICE-powered road vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Charge By Means Of Generators (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

In order to ensure engine starting even after a vehicle has been left for extended periods with electrical loads energised, a vehicle electrical system has two batteries, one (2) dedicated to a first set of loads (3) including those which may be switched on when the engine is not running, and the other (5) connected to the engine starting system (6). A device (4) prevents discharge of the other battery (5) through the first set of loads (3) while permitting the battery (5) to be charged by the generator (1) when the engine is running. The device (4) may be a rectifier or a switch operated by the engine. <IMAGE>

Description

SPECIFICATION Vehicle electrical system This invention relates to an electrical system for vehicles having an internal combustion engine.
The conventional motor car suffers from the disadvantage that it cannot start itself if it is left for long periods with electrical equipment such as headlights switched on. In such circumstances the battery is discharged and is no longer able to supply sufficient current to drive the starter motor and energise the ignition system.
According to the present invention, there is provided an electrical system for a vehicle having an internal combustion engine comprising a first set of loads including all vehicle electrical devices required to be operable when an engine run switch is in an "off" position; a second set of loads including all electrical devices required to start the engine; a first battery arranged for supplying the first set of loads; a second battery arranged for supplying the second set of loads; a common engine driven generator for supplying both sets of loads when the engine is running and for charging both batteries; and means for preventing discharge of the second battery through any load of the first set, at least when the engine running switch is in the "off" position.
Even if a vehicle having an electrical system embodying the invention is left for long periods with lights or other devices switched on, the second battery will retain its charge ready for starting the engine.
A number of subsidiary advantages are also obtained from the two battery concept of the invention. The first battery can be located remote from the engine compartment thereby easing packaging problems in the engine compartment.
The retaining bracket for the two smaller batteries can be more readily designed to meet battery retention standards. The batteries can have different discharge performance and different reserve capacity each appropriate to its primary function.
The invention will now be described with reference to the accompanying drawing in which the single figure is a schematic circuit diagram of a vehicle electrical system embodying the invention.
In the circuit diagram, two sets of vehicle electrical loads are represented by blocks 3 and 6.
The first set of loads 3 includes such electrical devices as dre required to be operated when the engine is stationary and the engine run switch is in its "off" position. These are particularly the vehicle parking lights, radio and clock. Other loads which are not required to be operated when the engine is switched off and not necessary for starting the engine may also be included in the first set of loads.
The second set of electrical loads 6 includes all devices necessary for starting the engine, that is to say the starter motor and ignition system and, optionally, other devices not required to be operated when the engine run switch is in its off position.
A first battery 2 with a high reserve capacity and a relatively low discharge performance is connected in circuit with the first set of loads 3 and a separate second battery 5 with a high discharge performance and a relatively low reserve capacity is connected in circuit with the second set of loads 6.
A device 4 prevents discharge of the second battery 5 through the first set of loads 3 but permits charging of the second battery 5 by an engine driven generator 1.
The discharge preventing device 4 may be a rectifier to present a low resistance to current passing from the generator 1 to the battery 5 but a high resistance in the opposite direction.
Alternative the device 4 may be a switch arranged to be mechanically or electrically operated by the engine run switch so that it is off which the engine run switch is off but on which the engine run switch is on. With this alternative arrangement the two sets of loads with their associated batteries may be transposed.
1. An electrical system for a vehicle having an internal combustion engine comprising: a) a first set of loads including all vehicle electrical devices required to be operable when an engine run switch is in an "off" position; b) a second set of loads including all electrical devices required to start the engine; c) a first battery arranged for supplying the first set of loads; d) a second battery arranged for supplying the second set of loads; e) a common engine driven generator for supplying both sets of loads when the engine is running and for charging both batteries; and f) means for preventing discharge of the second battery through any load of the first set, at least when the engine running switch is in the "off" position.
2. A vehicle electrical system as claimed in Claim 1, in which the generator is connected directly to the first battery and the discharge preventing means is a rectifier connected between the generator and the second battery and presenting a low re'sistance to charging of the second battery by the generator but a high resistance to discharge of the second battery through any load of the first set at any time.
3. A vehicle electrical system as claimed in Claim 1, in which the generator is connected directly to the second battery and the first battery is connected to the generator by the discharge preventing means.
4. A vehicle electrical system as claimed in Claim 3, in which the discharge preventing means id a switching device open when the engine is running.
5. A vehicle electrical system as claimed in any one of the preceding claims, in which the first battery is located remote from the second battery and remote from the engine compartment of the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Vehicle electrical system This invention relates to an electrical system for vehicles having an internal combustion engine. The conventional motor car suffers from the disadvantage that it cannot start itself if it is left for long periods with electrical equipment such as headlights switched on. In such circumstances the battery is discharged and is no longer able to supply sufficient current to drive the starter motor and energise the ignition system. According to the present invention, there is provided an electrical system for a vehicle having an internal combustion engine comprising a first set of loads including all vehicle electrical devices required to be operable when an engine run switch is in an "off" position; a second set of loads including all electrical devices required to start the engine; a first battery arranged for supplying the first set of loads; a second battery arranged for supplying the second set of loads; a common engine driven generator for supplying both sets of loads when the engine is running and for charging both batteries; and means for preventing discharge of the second battery through any load of the first set, at least when the engine running switch is in the "off" position. Even if a vehicle having an electrical system embodying the invention is left for long periods with lights or other devices switched on, the second battery will retain its charge ready for starting the engine. A number of subsidiary advantages are also obtained from the two battery concept of the invention. The first battery can be located remote from the engine compartment thereby easing packaging problems in the engine compartment. The retaining bracket for the two smaller batteries can be more readily designed to meet battery retention standards. The batteries can have different discharge performance and different reserve capacity each appropriate to its primary function. The invention will now be described with reference to the accompanying drawing in which the single figure is a schematic circuit diagram of a vehicle electrical system embodying the invention. In the circuit diagram, two sets of vehicle electrical loads are represented by blocks 3 and 6. The first set of loads 3 includes such electrical devices as dre required to be operated when the engine is stationary and the engine run switch is in its "off" position. These are particularly the vehicle parking lights, radio and clock. Other loads which are not required to be operated when the engine is switched off and not necessary for starting the engine may also be included in the first set of loads. The second set of electrical loads 6 includes all devices necessary for starting the engine, that is to say the starter motor and ignition system and, optionally, other devices not required to be operated when the engine run switch is in its off position. A first battery 2 with a high reserve capacity and a relatively low discharge performance is connected in circuit with the first set of loads 3 and a separate second battery 5 with a high discharge performance and a relatively low reserve capacity is connected in circuit with the second set of loads 6. A device 4 prevents discharge of the second battery 5 through the first set of loads 3 but permits charging of the second battery 5 by an engine driven generator 1. The discharge preventing device 4 may be a rectifier to present a low resistance to current passing from the generator 1 to the battery 5 but a high resistance in the opposite direction. Alternative the device 4 may be a switch arranged to be mechanically or electrically operated by the engine run switch so that it is off which the engine run switch is off but on which the engine run switch is on. With this alternative arrangement the two sets of loads with their associated batteries may be transposed. CLAIMS
1. An electrical system for a vehicle having an internal combustion engine comprising: a) a first set of loads including all vehicle electrical devices required to be operable when an engine run switch is in an "off" position; b) a second set of loads including all electrical devices required to start the engine; c) a first battery arranged for supplying the first set of loads; d) a second battery arranged for supplying the second set of loads; e) a common engine driven generator for supplying both sets of loads when the engine is running and for charging both batteries; and f) means for preventing discharge of the second battery through any load of the first set, at least when the engine running switch is in the "off" position.
2. A vehicle electrical system as claimed in Claim 1, in which the generator is connected directly to the first battery and the discharge preventing means is a rectifier connected between the generator and the second battery and presenting a low re'sistance to charging of the second battery by the generator but a high resistance to discharge of the second battery through any load of the first set at any time.
3. A vehicle electrical system as claimed in Claim 1, in which the generator is connected directly to the second battery and the first battery is connected to the generator by the discharge preventing means.
4. A vehicle electrical system as claimed in Claim 3, in which the discharge preventing means id a switching device open when the engine is running.
5. A vehicle electrical system as claimed in any one of the preceding claims, in which the first battery is located remote from the second battery and remote from the engine compartment of the vehicle.
6. A vehicle electrical system as claimed in any one of the preceding claims, in which the first battery has a lower discharge capacity than the second battery.
7. A vehicle electrical system as claimed in any one of the preceding claims, in which the first battery has a higher reserve capacity than the second battery.
8. A vehicle electrical system substantiaily as hereinbefore described with reference to and as shown in the accompanying drawing.
GB08305722A 1983-03-02 1983-03-02 Vehicle electrical system Withdrawn GB2136224A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08305722A GB2136224A (en) 1983-03-02 1983-03-02 Vehicle electrical system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08305722A GB2136224A (en) 1983-03-02 1983-03-02 Vehicle electrical system

Publications (2)

Publication Number Publication Date
GB8305722D0 GB8305722D0 (en) 1983-04-07
GB2136224A true GB2136224A (en) 1984-09-12

Family

ID=10538849

Family Applications (1)

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GB08305722A Withdrawn GB2136224A (en) 1983-03-02 1983-03-02 Vehicle electrical system

Country Status (1)

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GB (1) GB2136224A (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174558A (en) * 1985-03-28 1986-11-05 Sutton & Gates Power supply for a boat or caravan
EP0361824A2 (en) * 1988-09-26 1990-04-04 Nec Corporation Battery charger for vehicle-mounted equipment using engine operation as start timing determination
GB2245413A (en) * 1990-06-04 1992-01-02 Japan Storage Battery Co Ltd Main battery including a spare battery for use in emergency.
EP0464694A2 (en) * 1990-06-28 1992-01-08 Nippondenso Co., Ltd. Power source unit for an automotive vehicle
DE4219398A1 (en) * 1992-06-13 1993-12-16 Claas Ohg Buffered power supply for on-board electronics
GB2268342A (en) * 1991-10-15 1994-01-05 Gordon Kent Lambert Dual battery vehicle electrical system
FR2729901A1 (en) * 1995-01-30 1996-08-02 Valeo Equip Electr Moteur Energy management unit for motor vehicle with multiple energy storage
FR2739733A1 (en) * 1995-10-06 1997-04-11 Peugeot Dual battery electric supply device for motor vehicle with internal combustion engine
FR2750660A1 (en) * 1996-07-05 1998-01-09 Renault SYSTEM FOR MANAGING THE ENERGY GENERATED BY A HIGH POWER ALTERNATOR ON BOARD A VEHICLE
WO1998001669A1 (en) * 1996-07-03 1998-01-15 Renault System for managing electric energy and alternator for motor vehicle
WO1998019890A1 (en) * 1996-11-07 1998-05-14 Robert Bosch Gmbh Control unit for the power supply system on-board
EP0984543A2 (en) * 1998-09-02 2000-03-08 Scania CV Aktiebolag (publ) Electrical system for motor vehicles
US6313546B1 (en) * 1999-04-16 2001-11-06 Mitsubishi Denki Kabushiki Kaisha Power supply assembly for a vehicle
US6321707B1 (en) * 1998-11-12 2001-11-27 James Dunn Multifunction auxiliary vehicle power and starter system
WO2003023934A2 (en) * 2001-09-07 2003-03-20 Koeberl Heimo Switching arrangement for back-up accumulator and control device for a battery
WO2003056683A1 (en) * 2001-12-27 2003-07-10 Lear Automotive (Eeds) Spain, S.L. Circuit and method of controlling vehicle battery charges
DE4421540B4 (en) * 1993-06-25 2006-03-23 Denso Corp., Kariya Starter device for vehicles
GB2471930A (en) * 2009-07-15 2011-01-19 Int Truck Intellectual Prop Co Motor vehicle having plural batteries

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB979969A (en) * 1962-08-29 1965-01-06 Stone J & Co Ltd Improvements relating to battery installations for vehicles or aircraft
GB1115840A (en) * 1965-12-28 1968-05-29 Accumulateurs Fixes Improvements in or relating to electric power supplies for internal combustion engines equipped with electric starters
GB1436406A (en) * 1973-05-16 1976-05-19 Maremont Corp Dual battery electrical system for internal combsustion engine
GB1465693A (en) * 1973-05-11 1977-02-23 Cav Ltd Road vehicle electrical systems
GB2001489A (en) * 1977-07-20 1979-01-31 Simmet Snc Power supply system for loads on motor vehicles
GB1579496A (en) * 1976-10-26 1980-11-19 Bosch Gmbh Robert Power supply arangement for providing power for a two-voltage dc system particularly in a motor vehicle
GB1591946A (en) * 1976-11-06 1981-07-01 Bosch Gmbh Robert Power supplies for motor vehicles
EP0031225A1 (en) * 1979-12-21 1981-07-01 LUCAS INDUSTRIES public limited company Battery charging system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB979969A (en) * 1962-08-29 1965-01-06 Stone J & Co Ltd Improvements relating to battery installations for vehicles or aircraft
GB1115840A (en) * 1965-12-28 1968-05-29 Accumulateurs Fixes Improvements in or relating to electric power supplies for internal combustion engines equipped with electric starters
GB1465693A (en) * 1973-05-11 1977-02-23 Cav Ltd Road vehicle electrical systems
GB1436406A (en) * 1973-05-16 1976-05-19 Maremont Corp Dual battery electrical system for internal combsustion engine
GB1579496A (en) * 1976-10-26 1980-11-19 Bosch Gmbh Robert Power supply arangement for providing power for a two-voltage dc system particularly in a motor vehicle
GB1591946A (en) * 1976-11-06 1981-07-01 Bosch Gmbh Robert Power supplies for motor vehicles
GB2001489A (en) * 1977-07-20 1979-01-31 Simmet Snc Power supply system for loads on motor vehicles
EP0031225A1 (en) * 1979-12-21 1981-07-01 LUCAS INDUSTRIES public limited company Battery charging system

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174558A (en) * 1985-03-28 1986-11-05 Sutton & Gates Power supply for a boat or caravan
EP0361824A2 (en) * 1988-09-26 1990-04-04 Nec Corporation Battery charger for vehicle-mounted equipment using engine operation as start timing determination
EP0361824A3 (en) * 1988-09-26 1991-01-16 Nec Corporation Battery charger for vehicle-mounted equipment using engine operation as start timing determination
GB2245413B (en) * 1990-06-04 1994-08-03 Japan Storage Battery Co Ltd Electric storage battery arrangement
US5154985A (en) * 1990-06-04 1992-10-13 Japan Storage Battery Co., Ltd. Battery with a spare battery
GB2245413A (en) * 1990-06-04 1992-01-02 Japan Storage Battery Co Ltd Main battery including a spare battery for use in emergency.
EP0464694A2 (en) * 1990-06-28 1992-01-08 Nippondenso Co., Ltd. Power source unit for an automotive vehicle
EP0464694A3 (en) * 1990-06-28 1993-03-31 Nippondenso Co., Ltd. Power source unit for an automotive vehicle
GB2268342A (en) * 1991-10-15 1994-01-05 Gordon Kent Lambert Dual battery vehicle electrical system
DE4219398A1 (en) * 1992-06-13 1993-12-16 Claas Ohg Buffered power supply for on-board electronics
DE4421540B4 (en) * 1993-06-25 2006-03-23 Denso Corp., Kariya Starter device for vehicles
FR2729901A1 (en) * 1995-01-30 1996-08-02 Valeo Equip Electr Moteur Energy management unit for motor vehicle with multiple energy storage
FR2739733A1 (en) * 1995-10-06 1997-04-11 Peugeot Dual battery electric supply device for motor vehicle with internal combustion engine
WO1998001669A1 (en) * 1996-07-03 1998-01-15 Renault System for managing electric energy and alternator for motor vehicle
FR2750660A1 (en) * 1996-07-05 1998-01-09 Renault SYSTEM FOR MANAGING THE ENERGY GENERATED BY A HIGH POWER ALTERNATOR ON BOARD A VEHICLE
WO1998019890A1 (en) * 1996-11-07 1998-05-14 Robert Bosch Gmbh Control unit for the power supply system on-board
EP0984543A2 (en) * 1998-09-02 2000-03-08 Scania CV Aktiebolag (publ) Electrical system for motor vehicles
EP0984543A3 (en) * 1998-09-02 2004-01-21 Scania CV Aktiebolag (publ) Electrical system for motor vehicles
US6321707B1 (en) * 1998-11-12 2001-11-27 James Dunn Multifunction auxiliary vehicle power and starter system
US6313546B1 (en) * 1999-04-16 2001-11-06 Mitsubishi Denki Kabushiki Kaisha Power supply assembly for a vehicle
WO2003023934A2 (en) * 2001-09-07 2003-03-20 Koeberl Heimo Switching arrangement for back-up accumulator and control device for a battery
WO2003023934A3 (en) * 2001-09-07 2003-12-11 Heimo Koeberl Switching arrangement for back-up accumulator and control device for a battery
WO2003056683A1 (en) * 2001-12-27 2003-07-10 Lear Automotive (Eeds) Spain, S.L. Circuit and method of controlling vehicle battery charges
GB2471930A (en) * 2009-07-15 2011-01-19 Int Truck Intellectual Prop Co Motor vehicle having plural batteries

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)