CN104709273B - Control method for vehicle - Google Patents

Control method for vehicle Download PDF

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Publication number
CN104709273B
CN104709273B CN201410743711.8A CN201410743711A CN104709273B CN 104709273 B CN104709273 B CN 104709273B CN 201410743711 A CN201410743711 A CN 201410743711A CN 104709273 B CN104709273 B CN 104709273B
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CN
China
Prior art keywords
vehicle
torque
skidding
wheel
mode
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Expired - Fee Related
Application number
CN201410743711.8A
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Chinese (zh)
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CN104709273A (en
Inventor
西泽浩光
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Suzuki Motor Corp
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Suzuki Motor Corp
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT 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
    • B60K28/00Safety 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
    • B60K28/10Safety 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 
    • B60K28/16Safety 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/17Using electrical or electronic regulation means to control braking
    • B60T8/1755Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W10/00Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W10/00Conjoint control of vehicle sub-units of different type or different function
    • B60W10/12Conjoint control of vehicle sub-units of different type or different function including control of differentials
    • B60W10/14Central differentials for dividing torque between front and rear axles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W10/00Conjoint control of vehicle sub-units of different type or different function
    • B60W10/18Conjoint control of vehicle sub-units of different type or different function including control of braking systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W10/00Conjoint control of vehicle sub-units of different type or different function
    • B60W10/18Conjoint control of vehicle sub-units of different type or different function including control of braking systems
    • B60W10/184Conjoint control of vehicle sub-units of different type or different function including control of braking systems with wheel brakes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W30/00Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/02Control of vehicle driving stability
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60KARRANGEMENT 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
    • B60K23/00Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/04Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for differential gearing
    • B60K2023/043Control means for varying left-right torque distribution, e.g. torque vectoring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2201/00Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
    • B60T2201/14Electronic locking-differential
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W2520/00Input parameters relating to overall vehicle dynamics
    • B60W2520/10Longitudinal speed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W2520/00Input parameters relating to overall vehicle dynamics
    • B60W2520/26Wheel slip
    • B60W2520/266Slip values between left and right wheel
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W2710/00Output or target parameters relating to a particular sub-units
    • B60W2710/06Combustion engines, Gas turbines
    • B60W2710/0666Engine torque
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60WCONJOINT 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
    • B60W2720/00Output or target parameters relating to overall vehicle dynamics
    • B60W2720/30Wheel torque

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Regulating Braking Force (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)

Abstract

Engine torque control and braking force control, the control method for vehicle for improving cross-country ability can be coordinated when vehicle slip in a more effective manner by providing.Control method for vehicle includes:Skidding judgement handles (S104), judges whether vehicle (102) is in slipping state according to information of vehicles;Automatic transfer mode transfer processing (S106), when being judged as in slipping state, the automatic transfer mode of the 2nd small torque reduction amount is measured than the 1st torque reduction shift to making torque only reduce when skidding from making torque only reduce the normal mode of the 1st torque reduction amount when skidding;And direct torque processing (S108), the right wheel (134a) big to the wheel velocity in left and right wheels applies braking, torque is assigned to left wheel (134b) to control the torque of left and right wheels from right wheel from there through differential mechanism (136), to obtain making vehicle from the skidding rate being detached from of skidding, which is the ratio between left and right wheels speed difference and car speed.

Description

Control method for vehicle
Technical field
The present invention relates to the vehicle control sides for coordinating to carry out engine torque control and braking force control when vehicle slip Method.
Background technology
Control method as vehicles such as automobiles, it is known that be referred to as Electronic Stability Program (electronics Stability program), the vehicle attitude control of referred to as ESP (registered trademark).ESP includes TCS (Traction Control System:Traction control system) it controls, the brake force of the output (torque) and each wheel that usually make engine is coordinated to control The driving force for making each wheel improves the riding stability of vehicle.Specifically, rotation (skidding), left and right vehicle are crossed in generation wheel It in the case that wheel generates wheel speed difference, is controlled using TCS and reduces motor torque, braking is applied to wheel to reduce wheel speed Difference.
Apply braking and also referred to as brakes LSD (Limited Slip to reduce the control of wheel speed difference Differential:Limited-slip differential) control.Such as when the road surface contacted due to left and right wheels friction coefficient μ difference and When skidding has occurred, by braking the LSD controls side wheel application big to the wheel velocity in left and right wheels and wheel velocity Corresponding braking, another party's wheel is assigned to from there through differential attachment by torque from side's wheel.Here, existing in side's wheel In the case that skidding has occurred in poor road, deep trail road etc., another party's wheel wheel velocity compared with side's wheel is smaller, because The possibility that this road surface high with friction coefficient μ contacts is high.Thus, if to another party's wheel distribution of torque, vehicle is from beating Slip from possibility get higher.
In patent document 1, it describes and inhibits driving wheel in the case where driving wheel is absorbed in muddy, deep snow etc. and skids The driving-force control apparatus of skidding.It carries out in the apparatus control as follows:It is practical according to driving wheel speed and body speed of vehicle operation Skidding rate reduces driving force, and driven to forbid reducing according to the situation of vehicle if practical skidding rate is more than specified value Power.
In patent document 1, when situation, that is, accelerator operation amount of vehicle is specified value or more, body speed of vehicle is specified value When state below have passed through the stipulated time, can by forbid carrying out reducing the control of driving force come with accelerator operation amount phase The driving force answered is detached from from skidding.
Existing technical literature
Patent document
Patent document 1:Unexamined Patent 1-145242 bulletins
Invention content
Problems to be solved by the invention
In control described in Patent Document 1, when attempting to be detached from from skidding, accelerator is significantly stepped on, therefore start The rotating speed of machine is easy to the upper limit more than allowable range, in addition, applying big torque without a break, therefore is applied to the drive system of vehicle The load added increases.
Moreover, in patent document 1, be only forbid the reduction of driving force, and about driving force reduce how much, thus use Wheel distribution of torque is not recorded in braking LSD controls specifically to realize from disengaging this point of skidding.That is, 1 institute of patent document The technology of record is different from TCS controls, does not account for coordinating engine torque control and braking force control when vehicle slip. In addition, in coordinating to carry out the TCS controls of the two, there is also rooms for improvement.
For the present invention in view of the problem, its object is to can make motor torque control in a more effective manner when vehicle slip The control method for vehicle of cross-country ability is coordinated, improved to system and braking force control.
The solution to the problem
To solve the above-mentioned problems, the representative structure of control method for vehicle of the invention is, when vehicle slip to a left side The larger side's wheel of wheel velocity in right wheel apply it is corresponding with wheel velocity brake, from there through differential attachment will turn Square is assigned to another party's wheel from side's wheel, and above-mentioned control method for vehicle is characterised by comprising:Skidding judgement is handled, root Judge whether vehicle is in slipping state according to information of vehicles;Automatic transfer mode transfer processing, when judging vehicle for slipping state When, it is transferred to automatic transfer mode from normal mode, wherein above-mentioned normal mode is that torque is made only to reduce defined the when skidding 1 torque reduction amount, above-mentioned automatic transfer mode are to make torque only reduce when skidding to measure the 2nd small torque than the 1st torque reduction and subtract In a small amount;And direct torque processing, by applying the torque of control for brake left and right wheels to side's wheel, obtain can making vehicle from The defined skidding rate that slipping state is detached from, skidding rate is the ratio between left and right wheels speed difference and car speed.
According to the above configuration, if it is determined that vehicle is skidded, then the driving mode of vehicle is from normal mode to certainly Turn mode shifter shifts automatically.Here, under automatic transfer mode, torque is made only to reduce the 1st torque reduction than normal mode The 2nd small torque reduction amount is measured, therefore the total amount of motor torque becomes compared with the case where skidding has occurred under normal mode Greatly.If the wheel to dally when skidding is set as side's wheel, wheel velocity is certainly than the wheel velocity of another party wheel It greatly, also absolutely can bigger compared with the wheel velocity for assuming to cope with side's wheel when skidding under normal mode.Its reason It is, under automatic transfer mode compared under normal mode, the total amount bigger of torque.Thus, under automatic transfer mode, according to one The wheel velocity of square wheel is set and the brake force applied to side's wheel also becomes larger compared under normal mode.
Left and right wheels are distributed torque to by differential attachment, therefore when a side wheel big to wheel velocity applies big When brake force, torque is assigned to the small another party's wheel of wheel velocity from side's wheel.Braking LSD controls are utilized in the situation System.Also, braking LSD controls are carried out under automatic transfer mode, therefore compared under normal mode, brake force improve after from It is easier to reach the skidding rate from disengaging of skidding suitable for vehicle under turn mode shifter.The reason is that the torque of automatic transfer mode Total amount bigger, therefore a greater amount of torques can be distributed to another party's wheel, reach the expectation being unable to reach under normal mode Skidding rate possibility it is high.Alternatively, the reason is that, compared under normal mode, it can more quickly achieve desired skidding rate. In this way, in the present invention, when skidding, shifts automatically to above-mentioned automatic transfer mode, thus with skidded using normal mode reply Situation is compared, and cross-country ability is more improved.
It is with according to the skidding rate and vehicle of regulation speed to the braking that side's wheel applies in the processing of above-mentioned direct torque The defined brake force of setting is spent to carry out.As a result, when being transferred to automatic transfer mode from normal mode, by turning Square control process reaches skidding rate corresponding with car speed to control torque, and controls brake force to obtain defined system Power.Thus, vehicle can be easier to reach for from the skidding rate being detached from of skidding, further increasing cross-country ability.
The control method of above-mentioned vehicle further includes the lockdown mode transfer processing shifted to lockdown mode by manual operation, Under lockdown mode, when skidding, makes torque only reduce to measure the 3rd small torque reduction amount than the 2nd torque reduction, and when skidding pair The brake force that one side's wheel applies is more than the brake force applied under normal mode.As a result, in vehicle by shifting mould automatically Formula also can not from skid be detached from the case of, driving mode can be switched to lockdown mode by Operation switch etc..In locking mould Under formula, compared with automatic transfer mode, torque reduction amount becomes smaller, brake force becomes larger.Therefore, under lockdown mode, and from turn Mode shifter is compared, and the effect of braking LSD controls is more preferable, is more distributed from side's wheel to the small another party's wheel of wheel velocity Torque, therefore cross-country ability can be further increased.
Above-mentioned information of vehicles includes left and right wheels speed difference and the duration from generating wheel speed difference, at skidding judgement In reason, when left and right wheels speed difference and duration are respectively defined threshold or more, it can be determined that be skidding.In this way Given threshold can reliably judge to be difficult in normal mode downward driving, can be from normal mode to automatic transfer mode from turn It moves.Thus, driver can not have to pay attention to pavement state, can mitigate the burden of driver.
Can be that above-mentioned control method for vehicle further includes:It is detached from judgement processing, left and right wheels after being handled according to direct torque Whether the state that speed difference does not reach defined threshold continue for the stipulated time, to whether successfully judging for disengaging;And it is logical Normal pattern recovery processing, normal mode is reverted to when being judged as being detached from successfully from automatic transfer mode.As a result, from usual mould After formula is transferred to automatic transfer mode, automatic transfer mode lasts up to vehicle and is detached from from skidding, when being judged as from skidding successfully When disengaging, normal mode can be reverted to.Thus, the transfer from automatic transfer mode to normal mode will not continually occur, because The increase etc. with the associated vibration of switching of driving mode will not continually occurs in this, can inhibit driver's not assisting operationally Adjust sense.
Invention effect
According to the present invention it is possible to which engine torque control and braking can be made in a more effective manner in vehicle slip by providing Power control is coordinated, and the control method for vehicle of cross-country ability can be improved.
Description of the drawings
Fig. 1 is the vehicle for roughly showing to apply the controller of vehicle for the control method for vehicle for executing present embodiment Figure.
Fig. 2 is the block diagram of the function for the controller of vehicle for showing Fig. 1.
Fig. 3 is the figure for the driving mode table for showing Fig. 2.
Fig. 4 is the flow chart of the processing for the control method for vehicle for showing present embodiment.
Fig. 5 is the figure of the skidding rate table and brake force table that show Fig. 2.
Fig. 6 is to the skidding rate and the figure that is compared relative to car speed of brake force under each driving mode.
Reference sign
100 ... controller of vehicle, 102 ... vehicles, 104 ... vehicle control sections, 106 ... vehicle-wheel speed sensors, 108 ... Skidding judging part, 110 ... driving mode instruction units, 112 ... braking force control portions, 114 ... information of vehicles output sections, 116 ... meters When device, 118 ... storage parts, 120 ... driving mode tables, 122 ... engine torque control portions, 124 ... vehicle speed sensor, 126 ... Skidding rate table, 128 ... engines, 130 ... brake force tables, 132 ... braking systems, the right wheels of 134a ..., 134b ... left wheels, 136 ... differential mechanisms, 138 ... switches
Specific implementation mode
Hereinafter, explaining the preferred embodiment of the present invention in detail while with reference to attached drawing.Shown in the embodiment Size, material, other specific numerical value etc. are only for ease of understanding the illustration of invention, the case where in addition to special provision, no It is to limit present disclosure.In addition, in the present description and drawings, for having the function of substantially the same, wanting of constituting Element omits further repeated explanation by enclosing same reference numeral, in addition, pair with the present invention be not directly dependent upon want Plain illustration omitted.
Fig. 1 is the controller of vehicle 100 for roughly showing to apply the control method for vehicle for executing present embodiment The figure of vehicle 102.Fig. 2 is the block diagram of the function for the controller of vehicle 100 for showing Fig. 1.In addition, in Fig. 1, only showing vehicle Vehicle control section 104 included by control device 100 and vehicle-wheel speed sensor 106 are used in combination Fig. 2 to illustrate other compositions.
In vehicle 102, as shown in Figure 1, equipped with controller of vehicle 100.Controller of vehicle 100 has:Vehicle Control unit 104 is arranged near the engine room of vehicle front side, and execution is referred to as ESP (Electronic Stability Program vehicle attitude control);And vehicle-wheel speed sensor 106, detect the wheel velocity of each wheel.ESP includes TCS (Traction Control System) is controlled, and coordinates the braking force control for carrying out engine torque control and each wheel, Improve the riding stability of vehicle.In addition, vehicle 102 is premised on 4 wheel drives, but not limited to this, as long as coordinating to be started Machine direct torque and braking force control can also be front-wheel drive or rear wheel drive.
Vehicle control section 104 has as shown in Figure 2:Skidding judging part 108, driving mode instruction unit 110, braking force control Portion 112.Skidding judging part 108 judges whether vehicle 102 is in slipping state according to information of vehicles.Information of vehicles packet herein It includes:The left and right wheels speed difference detected by the vehicle-wheel speed sensor 106 of information of vehicles output section 114;And from generate wheel The duration measured by timer 116 that speed difference rises.
Driving mode instruction unit 110 reads the traveling preserved by storage part 118 according to the judging result of skidding judging part 108 Pattern table 120 (with reference to Fig. 3), indicates braking force control portion 112 and engine torque control portion 122 switching of driving mode. In addition, driving mode instruction unit 110 in addition to driving mode switching instruction other than, will also be for example by information of vehicles output section 114 The car speed that detects of vehicle speed sensor 124 exported to braking force control portion 112 and engine torque control portion 122.
Engine torque control portion 122 reads the skidding rate table 126 (with reference to Fig. 5 (a)) of storage part 118, is adjusted based on this The throttle opening etc. of motivation of haircuting 128 makes torque only reduce torque reduction amount corresponding with driving mode.Braking force control portion 112 read the brake force table 130 (with reference to Fig. 5 (b)) of storage part 118, the tune of the braking oil pressure based on this progress braking system 132 It is whole etc., control the brake force applied to left and right wheels 134a, 134b.The control of the brake force is according to reduction left and right wheels What the braking LSD controls of the wheel speed difference of 134a, 134b carried out.
That is, being distributed by engine torque control via the differential mechanism 136 as differential attachment left and right wheels 134a, 134b Portion 122 reduced according to driving mode after torque.As an example, when to the big side's wheel of wheel velocity (such as right wheel When 134a) applying big brake force, torque is assigned to the small another party's wheel of wheel velocity (such as left vehicle from right wheel 134a Take turns 134b).In addition, driving mode can also be, not only according to the judging result of skidding judging part 108 by driving mode instruction unit 110 automatically indicate that switching, are also suitably switched by using the manual operation of switch 138.
Fig. 3 is the figure for the driving mode table 120 for showing Fig. 2.In vehicle 102, multiple driving modes are set as shown in the figure. Apply much degree according to being the torque reduction amount for making torque only reduce much degree when vehicle 102 skids, or to wheel Brake force distinguish these driving modes.
Normal mode is the pattern as benchmark, also referred to as AUTO (automatic) pattern.Under normal mode, work as vehicle 102 make torque only reduce defined 1st torque reduction amount (being " normal " in figure) when skidding, and apply defined system to wheel Power (being " normal " in figure).Snow field mode be on the low road surface of friction coefficient μ when driving preferred pattern, vehicle Torque reduction amount when 102 skidding is maximum (being " big " in figure), the braking of braking-force ratio normal mode in driving mode Power is small (being " small " in figure).Motor pattern be moved on dry pavement when driving preferred pattern.Motor pattern makes to turn Square only reduces measures the 2nd small torque reduction amount (being " small " in figure) than the 1st torque reduction under normal mode, and braking-force ratio is logical The brake force of norm formula is big (in figure for " in ").
Lockdown mode is the pattern for paying attention to cross-country ability, in the poor roads such as more concave-convex slope roads or deep trail road that for example rise and fall On obtain using in the case of the driving force of each wheel with being unable to fully when driving.Under lockdown mode, when vehicle 102 skids So that torque is only reduced and measure the 3rd small torque reduction amount (being " minimum " in figure) than the 2nd torque reduction, brake force is in driving mode In be maximum (being " maximum " in figure).3rd torque reduction amount is minimum in driving mode.In addition, the system under lockdown mode The brake force of power and normal mode is comparably more than double.It can be by using the hand of the switch 138 of controller of vehicle 100 Dynamic operation properly selects this 4 driving modes.
Automatic transfer mode and 4 driving mode differences, be in the case where having selected the pattern in addition to lockdown mode, The pattern (aftermentioned) that vehicle 102 shifts automatically when skidding.Automatic transfer mode is when vehicle 102 skids in the same manner as motor pattern Torque is set only to reduce the 2nd torque reduction amount (in figure be " small "), brake force is to be only second to the big brake force of lockdown mode (scheming In be " big ").
In the following, explanation has occurred in the vehicle 102 in being travelled on poor road in the case of skidding with normal mode Control method for vehicle.Fig. 4 is the flow chart of the processing for the control method for vehicle for showing present embodiment.Fig. 5 is to show beating for Fig. 2 The figure of sliding rate table 126 and brake force table 130.
First, vehicle 102 travels (step S100) with normal mode, if generation is poor in the wheel velocity of left and right (step S102), the then judging part 108 that skids judge whether to be regarded as skidding (step S104, skidding judgement processing).By beating Sliding judgement processing, when the left and right wheels speed difference for being measured as being detected by vehicle-wheel speed sensor 106 by timer 116 is about 3.0km/h or more, the wheel speed difference continue 500ms or more, then being judged as skidding occurs ("Yes").In addition, if left and right wheels Speed difference and duration do not reach above-mentioned each threshold value respectively, then the judging part 108 that skids is not intended as skidding ("No"), again returns to Step S102.
If being judged as skidding by skidding judgement processing, driving mode instruction unit 110 is to motor torque control Instruction that portion 122 and braking force control portion 112 processed output are shifted from from normal mode to automatic transfer mode (step S106, automatically Transfer mode transfer processing).Here, by automatic transfer mode transfer processing, being transferred to, which makes torque only reduce, compares normal mode The 1st torque reduction measure the automatic transfer mode of the 2nd small torque reduction amount.Therefore, the total amount of motor torque and usual mould The case where skidding has occurred under formula, which is compared, to become larger.That is, by automatic transfer mode transfer processing, it is transferred to automatic transfer mode, Thus allow the skidding of bigger.
Then, engine torque control portion 122 and braking force control portion 112 control left and right wheels 134a, 134b in phase Torque (step S108, direct torque processing).In direct torque processing, it is based on the skidding rate table 126 of Fig. 5 (a), is terrible To skidding rate corresponding with car speed, for example right wheel 134a big to the wheel velocity in left and right wheels 134a, 134b is applied Add it is corresponding with wheel velocity brake, torque is assigned to left wheel 134b from right wheel 134a from there through differential mechanism 136.
Here, as shown in Fig. 5 (a), skidding rate table 126, which is preserved, to be based on horizontal axis X being set as car speed, sets longitudinal axis Y For skidding rate when the obtained approximate functions of each point A, preserve the power function (Y=9.6X of 1/X as an example-1.2).In addition, It is left and right wheels speed difference and the vehicle for vehicle 102 from disengaging of skidding with skidding rate corresponding with the car speed shown in power function The ratio between speed.Each point A shows the skidding rate corresponding with car speed when actually vehicle 102 is detached from from skidding.Therefore, it sends out Motivation torque control division 122 can be by obtaining suitably setting in the way of the skidding rate shown in power function corresponding with car speed Engine control threshold of the usual practice such as the throttle opening for adjusting engine.In addition, motor pattern also shifts mould with automatic Formula similarly makes torque only reduce the 2nd torque reduction amount when skidding.Therefore, in the sport mode, it can set and be based on beating The engine control threshold of skidding rate shown in sliding rate table 126.
Moreover, in direct torque processing, it is corresponding from the car speed of disengaging that skids with for vehicle 102 in order to obtain Skidding rate, such as brake force table 130 shown in Fig. 5 (b) can be based on and determine the braking applied to right wheel 134a.As schemed Show, brake force table 130 is preserved based on each when horizontal axis X being set as car speed, longitudinal axis Y being set as to the change multiplying power of brake force The approximate function that point B is obtained, preserves the power function (Y=66.2X of 1/X as an example- 0.8).In addition, being shown with power function The change multiplying power of brake force be multiplying power when brake force when will be usual is set as " 1 ", according to the inertia force for acting on vehicle 102 It is suitably set with the relationship for being detached from required driving force (torque), indicates that the car speed the low more needs big brake force.Respectively Point B shows to actually get the change multiplying power of the brake force of skidding rate shown in Fig. 5 (a).Therefore, braking force control portion 112 can Control for brake threshold value to suitably adjust the braking oil pressure for example for adjusting braking system 132 is used and car speed The change multiplying power for the brake force that corresponding power function indicates.
That is, in direct torque processing, above-mentioned braking LSD controls are carried out under automatic transfer mode.Here, if will be The wheel to dally when skidding under automatic transfer mode is set as right wheel 134a, then wheel speed of its wheel velocity than left wheel 134b Degree is big.In addition, the wheel velocity of the right wheel 134a under transfer mode is compared under normal mode automatically, under automatic transfer mode Torque total amount bigger, therefore with assume under normal mode cope with skid when right wheel 134a wheel velocity compared with, It also absolutely can bigger.Thus, under automatic transfer mode, according to the setting of the wheel velocity of right wheel 134a to right wheel 134a The brake force of application also bigger compared under normal mode.
Also, automatic transfer mode is compared with normal mode, the total amount bigger of torque, therefore can be by a greater amount of torque point It is fitted on left wheel 134b, the possibility that can reach the desired skidding rate being unable to reach under normal mode is got higher.In addition, automatic Transfer mode can more quickly reach desired skidding rate compared with normal mode.Thus, in direct torque processing, with it is logical Under automatic transfer mode after being improved compared to brake force under norm formula, vehicle 102 is easy to reach the skidding suitable for from disengaging of skidding Rate.Thus, according to control method for vehicle, when skidding, shifts automatically to automatic transfer mode, is thus coped with under normal mode The case where skidding, is compared, and cross-country ability can be more improved.In other words, according to control method for vehicle, in vehicle slip with more effective Mode coordinates engine torque control and braking force control, improves cross-country ability.
Then, after the processing of the direct torque of step S108, skidding judging part 108 is not reached as left and right wheels speed difference When continue for 2500ms or more to the state of 3.0km/h, it is judged as being detached from succeed (step S110 is detached from judgement and handles).When When being judged as being detached from successfully by being detached from judgement processing ("Yes"), driving mode instruction unit 110 is to engine torque control portion 122 The instruction (normal mode recovery processing) that normal mode is reverted to from automatic transfer mode is exported with braking force control portion 112.
On the other hand, when being judged as being detached from not successful by being detached from judgement processing ("No"), driving mode instruction unit 110 judge whether to generate the driving mode switching signal (step S112) associated with the manual operation of switch 138.When in step When generating driving mode switching signal in S112 ("Yes"), driving mode instruction unit 110 is to engine torque control portion 122 and system Force control section 112 exports instruction (the step S114, at lockdown mode transfer shifted from automatic transfer mode to lockdown mode Reason).
Under lockdown mode, when as described above skid, torque is made only to reduce than under automatic transfer mode and motor pattern The 2nd torque reduction measure the 3rd small torque reduction amount.Moreover, under lockdown mode, system that when skidding applies right wheel 134a Power is maximum in each driving mode.Therefore, under lockdown mode, compared with automatic transfer mode, the effect of braking LSD controls Fruit is more preferable, and the right wheel 134a big from wheel velocity is to the small left wheel 134b more distribution of torque, therefore energy of wheel velocity Further increase cross-country ability.Also, after being transferred to lockdown mode, vehicle 102, which can be realized from skidding, is detached from (step S116).
Fig. 6 is to the skidding rate and the figure that is compared relative to car speed of brake force under each driving mode.Fig. 6 (a) Shown in coordinate diagram C be to replace the obtained approximate functions of each point A shown in the skidding rate table 126 based on Fig. 5 (a), by each point A that Coordinate diagram obtained from this connection.Coordinate diagram C shows the skidding rate under automatic transfer mode and motor pattern.Shown in Fig. 6 (a) The skidding rate under normal mode, lockdown mode and snow field mode is shown respectively in coordinate diagram D, E and F, is each point that will be drawn Coordinate diagram obtained from being connected to each other.
Compare each coordinate diagram C, D, E and F, as an example, when car speed be 15 left and right (km/h) when, skidding rate it is big It is small to become " the automatic transfer modes of snow field mode < normal modes <=motor pattern < lockdown modes ".According to the content, skid The torque reduction amount correspondence of each driving mode of the magnitude relationship of rate as shown in figure 3 is obvious.
Coordinate diagram G shown in Fig. 6 (b) is to replace the approximation that each point B is obtained shown in the brake force table 130 based on Fig. 5 (b) Function, coordinate diagram obtained from each point B is connected to each other.Coordinate diagram G shows the brake force under automatic transfer mode.Fig. 6 (b) institutes The brake force under motor pattern, normal mode, lockdown mode and snow field mode is shown respectively in coordinate diagram H, I, J and K for showing, It is coordinate diagram obtained from each point that will be drawn is connected to each other.
Comparing each coordinate diagram G, H, I, J and K, the magnitude relationship of the brake force of the size of brake force as shown in figure 3 corresponds to, As " the automatic transfer mode < lockdown modes of snow field mode < normal mode < motor patterns < ".
In this way according to control method for vehicle, if it is determined that vehicle 102 is skidded, then driving mode can be from usual mould Formula shifts automatically to automatic transfer mode, and coordinates to start in a more effective manner based on skidding rate table 126 and brake force table 130 Machine direct torque and braking force control control the torque of left and right wheels 134a, 134b.Thus, in control method for vehicle, if Fixed automatic transfer mode, thus not only improves cross-country ability with normal mode compared with, but also need not driver is in person in skidding Manual operation switch 138 switches driving mode, can reduce the burden of driver.
In addition, according to control method for vehicle, judge that vehicle 102 is skidded based on defined threshold, therefore can be reliably Judge to be difficult in normal mode downward driving, driver can mitigate the burden of driver without pavement state is paid attention to.
In addition, according to control method for vehicle, the case where vehicle 102 can not be also detached from by automatic transfer mode from skidding Under, can manual operation switch 138 be switched to lockdown mode.Therefore, braking LSD controls can be improved by control method for vehicle Effect and improve cross-country ability, can from skid be detached from.
In addition, according to control method for vehicle, after being transferred to automatic transfer mode from normal mode, automatic transfer mode is held It is continuous until vehicle 102 is detached from from skidding, when be judged as from skid successfully be detached from when, normal mode can be automatically restored to.Thus, The transfer from automatic transfer mode to normal mode will not continually occur, therefore the switching of driving mode will not continually occur The increase etc. of the vibration brought can inhibit the incongruity of driver operationally.
Moreover, according to control method for vehicle, automatic transfer mode is different from the lockdown mode of cross-country ability is paid attention to, and brake force is more It is small, therefore influence or the load for bringing drive system can be reduced, and also the vibration that brake band comes will not further increase, and can press down Make operational incongruity.
More than, the preferred embodiment of the present invention is illustrated while with reference to attached drawing, the present invention is not limited to the examples certainly. If it is those skilled in the art, then in the scope that claim is recorded it is contemplated that various modifications or modification be it is aobvious and It is clear to, and understands that these modifications or modification also belong to the technical scope of the present invention certainly.
Industrial utilizability
Present invention can apply to coordinate to carry out the vehicle control of engine torque control and braking force control when vehicle slip Method processed.

Claims (7)

1. a kind of control method for vehicle, when vehicle slip a side wheel larger to the wheel velocity in left and right wheels apply with The wheel velocity is braked accordingly, and torque is assigned to another party's wheel from the side wheel from there through differential attachment, above-mentioned Control method for vehicle is characterised by comprising:
Skidding judgement is handled, and the duration according to the difference of the wheel velocity of left and right and from the difference for generating the wheel velocity judges Whether vehicle is in slipping state;
Automatic transfer mode transfer processing is transferred to automatic transfer mould when judging that vehicle is in slipping state from normal mode Formula, wherein above-mentioned normal mode is that torque is made only to reduce defined 1st torque reduction amount, above-mentioned automatic transfer mode when skidding The 2nd small torque reduction amount is measured than the 1st torque reduction to make torque only reduce when skidding;And
Direct torque processing is coordinated with above-mentioned automatic transfer mode transfer processing, by applying braking control to one side wheel The torque of left and right wheels processed, obtains the defined skidding rate that vehicle can be made to be detached from from slipping state, and above-mentioned skidding rate is left and right The ratio between the difference of wheel velocity and car speed.
2. control method for vehicle according to claim 1, which is characterized in that
The braking applied to one side wheel in the processing of above-mentioned direct torque is with according to above-mentioned defined skidding rate and vehicle The defined brake force of speed setting carries out.
3. control method for vehicle according to claim 1, which is characterized in that
The control method for vehicle further includes the lockdown mode transfer processing shifted to lockdown mode by manual operation,
Under above-mentioned lockdown mode, when skidding, makes torque only reduce to measure the 3rd small torque reduction amount than the 2nd torque reduction, and The brake force applied under above-mentioned normal mode is more than to the brake force that one side wheel applies when skidding.
4. control method for vehicle according to claim 2, which is characterized in that
The control method for vehicle further includes the lockdown mode transfer processing shifted to lockdown mode by manual operation,
Under above-mentioned lockdown mode, when skidding, makes torque only reduce to measure the 3rd small torque reduction amount than the 2nd torque reduction, and The brake force applied under above-mentioned normal mode is more than to the brake force that one side wheel applies when skidding.
5. control method for vehicle according to any one of claims 1 to 4, which is characterized in that
Above-mentioned skidding judgement processing in, when left and right wheel velocity difference and from generate the wheel velocity difference it is lasting when Between be respectively defined threshold more than when, be judged as being skidded.
6. control method for vehicle according to any one of claims 1 to 4, which is characterized in that further include:
It is detached from judgement processing, the difference of the wheel velocity of left and right does not reach the shape of defined threshold after being handled according to above-mentioned direct torque Whether state continue for the stipulated time, to whether successfully judging for disengaging;And
Normal mode recovery is handled, and when being judged as being detached from successfully, above-mentioned normal mode is reverted to from above-mentioned automatic transfer mode.
7. control method for vehicle according to claim 5, which is characterized in that further include:
It is detached from judgement processing, the difference of the wheel velocity of left and right does not reach the shape of defined threshold after being handled according to above-mentioned direct torque Whether state continue for the stipulated time, to whether successfully judging for disengaging;And
Normal mode recovery is handled, and when being judged as being detached from successfully, above-mentioned normal mode is reverted to from above-mentioned automatic transfer mode.
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