GB2343428A - Vehicle traction control - Google Patents

Vehicle traction control Download PDF

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Publication number
GB2343428A
GB2343428A GB9924308A GB9924308A GB2343428A GB 2343428 A GB2343428 A GB 2343428A GB 9924308 A GB9924308 A GB 9924308A GB 9924308 A GB9924308 A GB 9924308A GB 2343428 A GB2343428 A GB 2343428A
Authority
GB
United Kingdom
Prior art keywords
torque
motor
vehicle
power train
control
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.)
Ceased
Application number
GB9924308A
Other versions
GB9924308D0 (en
Inventor
Carl Charles Bourne
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.)
MG Rover Group Ltd
Original Assignee
MG Rover Group Ltd
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 MG Rover Group Ltd filed Critical MG Rover Group Ltd
Publication of GB9924308D0 publication Critical patent/GB9924308D0/en
Publication of GB2343428A publication Critical patent/GB2343428A/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K28/00—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions
    • B60K28/10—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle 
    • B60K28/16—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle  responsive to, or preventing, skidding of wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/42—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by the architecture of the hybrid electric vehicle
    • B60K6/48—Parallel type
    • B60K6/485—Motor-assist type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/50—Architecture of the driveline characterised by arrangement or kind of transmission units
    • B60K6/52—Driving a plurality of drive axles, e.g. four-wheel drive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
    • B60L50/15—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with additional electric power supply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
    • 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
    • Y02T10/62—Hybrid 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
    • Y02T10/72—Electric energy management in electromobility

Abstract

A vehicle power train includes an internal combustion engine 10 and an electric motor 12 operating in parallel. The torque output from the motor 12 is controlled so as to vary in time as a series of pulses which are synchronised with the pulses in torque from the engine 10. The total torque output of the power train can thereby be controlled so as to be smooth or spiked depending on the surface over which the vehicle is travelling. This can improve traction.

Description

Vehicle Traction Control The present invention relates to the improvement of traction in vehicles, and is particularly suitable for electric or hybrid vehicles.
Accordingly the present invention provides a vehicle having a ground engaging wheel and a power train for providing driving torque to the wheel, the power train including an electric motor and control means arranged to control variations in drive torque from the motor so as to produce a pulsed torque output and the pulsed torque output comprising a plurality of torque pulses of a torque response shape and at respective time intervals from one another as determined by the controller to facilitate traction of the vehicle through the wheel upon a surface suitable for that type of surface as determined by the controller through appropriate sensing means.
Preferably the power train further comprises a combustion engine arranged to provide torque to the wheels in parallel with the electric motor, wherein the control means is arranged to control the timing of variations in torque from the motor so as to be in a predetermined temporal relationship with pulses in torque from the engine.
Preferably the vehicle further comprises surface monitoring means arranged to continuously monitor the nature of the surface over which the vehicle is travelling, wherein the control means is arranged to control the torque pulses from the motor dependent on the current nature of said surface.
Preferred embodiments of the present invention will now be described by way of example only with reference to the accompanying drawings in which : Figure 1 is a schematic representation of a vehicle according to the invention ; Figures 2 to 5 are graphs showing the output torque from parts of the power train of the vehicle of Figure 1.
Referring to Figure 1, a hybrid vehicle comprises an internal combustion engine 10, which is a diesel compression ignition type engine, and an electrical motor 12 providing driving torque in parallel to the vehicle's wheels 14 via a transmission 16. The motor 12 is controlled by a control unit 18 and the fuelling and ignition of the engine 10 is controlled by an engine management unit 20. The motor control unit 18 receives information from the engine management unit 20 about the timing of ignition and the position of the engine crankshaft so that the motor control unit can determine the timing and shape of the torque output spikes from the engine 10. This enables it to control the nature and timing of variations in motor output torque so that the total output torque of the power train can be controlled.
Figure 2 shows the variation in time of the torque T output by the diesel engine. As can be seen, the torque is produced as a series of sharp pulses or spikes each of which is produced by the ignition of fuel in one of the cylinders of the engine.
Figure 3 shows variation in time of the torque T output by a DC electric motor when operated conventionally. Basically for a constant current the torque varies in a smooth and regular manner about a mean output torque Tm.
Conventionally hybrid power train control consists of controlling the absolute values and the ratios of the respective drive torque from the motor and from the engine. The torque curves, as shown in Figures 2 and 3, are simply superimposed on top of each other.
According to the invention the motor control unit 18 is arranged to control the output torque of the motor in various ways depending on the driving conditions of the vehicle.
If the vehicle is driving on a road or other flat firm surface when the motor is the sole or main source of drive torque, the motor 12 is controlled so as to produce a smoothly varying torque output as this generally provides the best traction. However if the engine and the motor are both producing torque on this type of surface, then the motor control unit 18 is arranged to determine from the engine control unit 20 when the peaks in torque from the engine are produced. It then produces a dip or drop in torque to coincide with the peaks from the engine. The result is that the total torque produced the power train is smoother than that produced by just an engine, which tends to improve traction on this type of surface.
If the vehicle is travelling on a surface with a low coefficient of friction in an off-road situation, such as sand or gravel, it can be desirable to have a spiked torque output from the power train. Therefore on this type of surface if the motor 12 is the sole or main source of torque then its torque output is controlled so as to be uneven, comprising a series of spikes as shown in Figure 4. If the engine and the motor are both producing torque on this type of surface, then the motor control unit 18 again controls the torque from the motor so that it varies in a cyclical manner producing a series of peaks or spikes, and control the temporal relationship between the pulses or variations in torque from the motor 12 and the peaks in torque from the engine 10. The timing of the two torque outputs is therefore synchronised so as to produce a total torque output from the power train as shown in Figure 5 which comprises a series of torque pulses the shape of which is controlled so as to maximise the traction of the vehicle.
As is well known in the art it is possible to monitor the type of surface over which the vehicle is travelling, for example by monitoring the changes in wheel speed produced by known changes in drive torque. The motor control unit 18 therefore contains a map of preferred total drive torque characteristic for various types of surface so that the shape of the torque pulses, or torque variations if pulses are not desirable, can be matched to the surface so as to maximise traction.

Claims (5)

  1. CLAIMS 1. A vehicle having a ground engaging wheel and a power train for providing driving torque to the wheel, the power train including an electric motor and control means arranged to control variations in drive torque from the motor so as to produce a pulsed torque output and the pulsed torque output comprising a plurality of torque pulses of a torque response shape and at respective time intervals from one another as determined by the controller to facilitate traction of the vehicle through the wheel upon a surface suitable for that type of surface as determined by the controller through appropriate sensing means.
  2. 2. A vehicle according to claim 1 wherein the power train further comprises a combustion engine arranged to provide torque to the wheels in parallel with the electric motor, wherein the control means is arranged to control the timing of variations in torque from the motor so as to be in a predetermined temporal relationship with pulses in torque from the engine.
  3. 3. A vehicle having a ground engaging wheel and a power train for providing driving torque to the wheel, the power train including an electric motor and control means arranged to control variations in drive torque from the motor wherein the power train further comprises a combustion engine arranged to provide torque to the wheels in parallel with the electric motor, and the control means is arranged to control the timing of variations in torque from the motor so as to be in a predetermined temporal relationship with pulses in torque from the engine.
  4. 4. A vehicle according to any foregoing claim further comprising surface monitoring means arranged to continuously monitor the nature of the surface over which the vehicle is travelling, wherein the control means is arranged to control the variations in torque from the motor in dependence on the current nature of said surface.
  5. 5. A vehicle substantially as hereinbefore described with reference to the accompanying drawings.
GB9924308A 1998-11-04 1999-10-15 Vehicle traction control Ceased GB2343428A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB9824099.7A GB9824099D0 (en) 1998-11-04 1998-11-04 Vehicle traction control

Publications (2)

Publication Number Publication Date
GB9924308D0 GB9924308D0 (en) 1999-12-15
GB2343428A true GB2343428A (en) 2000-05-10

Family

ID=10841793

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9824099.7A Ceased GB9824099D0 (en) 1998-11-04 1998-11-04 Vehicle traction control
GB9924308A Ceased GB2343428A (en) 1998-11-04 1999-10-15 Vehicle traction control

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9824099.7A Ceased GB9824099D0 (en) 1998-11-04 1998-11-04 Vehicle traction control

Country Status (1)

Country Link
GB (2) GB9824099D0 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1777096A1 (en) * 2005-10-24 2007-04-25 Hitachi, Ltd. Vehicle drive unit
WO2014187864A1 (en) * 2013-05-21 2014-11-27 Arjo Hospital Equipment Ab Assisted propulsion system, method and chassis

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4699097A (en) * 1984-08-31 1987-10-13 Mazda Motor Corporation Means for suppressing engine output torque fluctuations
EP0354790A2 (en) * 1988-08-12 1990-02-14 Hitachi, Ltd. Method and apparatus for controlling power generation in internal combustion engines
US5349278A (en) * 1993-05-13 1994-09-20 Hughes Aircraft Company Torque oscillation compensation utilizing velocity feedback
WO1997008439A1 (en) * 1995-08-31 1997-03-06 Isad Electronic Systems Gmbh & Co. Kg Drive system with a drive engine, an electrical machine and a battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4699097A (en) * 1984-08-31 1987-10-13 Mazda Motor Corporation Means for suppressing engine output torque fluctuations
EP0354790A2 (en) * 1988-08-12 1990-02-14 Hitachi, Ltd. Method and apparatus for controlling power generation in internal combustion engines
US5349278A (en) * 1993-05-13 1994-09-20 Hughes Aircraft Company Torque oscillation compensation utilizing velocity feedback
WO1997008439A1 (en) * 1995-08-31 1997-03-06 Isad Electronic Systems Gmbh & Co. Kg Drive system with a drive engine, an electrical machine and a battery

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1777096A1 (en) * 2005-10-24 2007-04-25 Hitachi, Ltd. Vehicle drive unit
US7455143B2 (en) 2005-10-24 2008-11-25 Hitachi, Ltd. Vehicle drive unit
CN100509473C (en) * 2005-10-24 2009-07-08 株式会社日立制作所 Vehicle drive unit
WO2014187864A1 (en) * 2013-05-21 2014-11-27 Arjo Hospital Equipment Ab Assisted propulsion system, method and chassis
KR20160013084A (en) * 2013-05-21 2016-02-03 아르조 하스피탈 이큅먼트 에이비 Assisted propulsion system, method and chassis
CN105392459A (en) * 2013-05-21 2016-03-09 阿乔医用设备有限公司 Assisted propulsion system, method and chassis
JP2016525977A (en) * 2013-05-21 2016-09-01 アルジョ ホスピタル イクイップメント アクチエボラグＡｒｊｏ Ｈｏｓｐｉｔａｌ Ｅｑｕｉｐｍｅｎｔ ＡＢ Auxiliary propulsion system, method and chassis
US9937943B2 (en) 2013-05-21 2018-04-10 Arjo Hospital Equipment Ab Assisted propulsion system, method and chassis
AU2014270440B2 (en) * 2013-05-21 2018-09-20 Arjo IP Holding Aktiebolag Assisted propulsion system, method and chassis
JP2019163034A (en) * 2013-05-21 2019-09-26 アルジョ アイピー ホールディング アクチエボラグＡｒｊｏ ＩＰ Ｈｏｌｄｉｎｇ Ａｋｔｉｅｂｏｌａｇ Auxiliary propulsion system, method and chassis
KR102351719B1 (en) 2013-05-21 2022-01-17 아르조 아이피 홀딩 악티볼락 Assisted propulsion system, method and chassis

Also Published As

Publication number Publication date
GB9824099D0 (en) 1998-12-30
GB9924308D0 (en) 1999-12-15

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Legal Events

Date Code Title Description
AT Applications terminated before publication under section 16(1)