Control Device for Vehicle

• US 20080133066A1
• Filed: 08/04/2005
• Published: 06/05/2008
• Est. Priority Date: 08/06/2004
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Takenaka, Toru
• Granted Patent: US 7,702,442 B2
• Time in Patent Office: Days
• US Class Current: 701/1
• CPC Class Codes: B60G 17/0195 characterised by the regulation being combined with other vehicle control systems conjoint control of vehicle sub-units including control of suspension systems B60W10/22
• CPC Class Codes: B60T 8/1755 Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02
• CPC Class Codes: B60W 10/20 including control of steering systems
• CPC Class Codes: B60W 2050/0028 Mathematical models, e.g. for simulation
• CPC Class Codes: B60W 40/064 Degree of grip
• CPC Class Codes: B60W 40/068 Road friction coefficient
• CPC Class Codes: B60W 40/10 related to vehicle motion
• CPC Class Codes: B62D 6/003 in order to control vehicle yaw movement, i.e. around a vertical axis B62D6/007 takes precedence
• CPC Class Codes: B62D 6/008 Control of feed-back to the steering input member, e.g. simulating road feel in steer-by-wire applications

Abstract

A control device for a vehicle is equipped with a vehicle model motion determining device for determining a motion of a vehicle (a vehicle model motion) on a vehicle model expressing the dynamic characteristics of a vehicle on the basis of drive manipulated variables, such as an angle of steering by a driver, and a state amount error reaction control device for determining control inputs to an actuator control device of the actual vehicle and the vehicle model motion determining device according to a feedback law on the basis of a difference between a state amount of a vehicle model motion (model state amounts, such as a position or a posture of a vehicle) and a state amount of a motion of the actual vehicle 1 (a state amount error). Based on a state amount error, not only a motion of an actual vehicle but also a vehicle model motion is manipulated, thereby enhancing robustness against disturbance factors or their changes while conducting actuator operation control that is suited to a behavior of the actual vehicle as much as possible.

Claims

1. A control device for a vehicle equipped with a drive manipulated variable output means for outputting a drive manipulated variable that indicates a drive manipulation state of a vehicle driven by a driver of the vehicle having a plurality of wheels, an actuator device provided in the vehicle so as to be able to perform manipulation of a predetermined motion of the vehicle, and an actuator device control means for controlling an operation of the actuator device, the control device for a vehicle comprising:

an actual state amount grasping means for detecting or estimating an actual state amount, which is a predetermined state amount related to an actual motion of the vehicle;

a vehicle model motion determining means for determining a vehicle model motion, which is a vehicle motion on a first vehicle model expressing dynamic characteristics of the vehicle, on the basis of at least the drive manipulated variable; and

a state amount error reaction control means for determining an actual vehicle actuator manipulation control input for manipulating the actuator device of an actual vehicle and a vehicle model manipulation control input for manipulating the vehicle model motion according to a predetermined feedback control law on the basis of a first state amount error, which is the difference between an actual state amount that has been detected or estimated and a model state amount, which is the predetermined state amount related to the vehicle model motion,

wherein the actuator device control means comprises a means for controlling the actuator device on the basis of at least the actual vehicle actuator manipulation control input, and

the vehicle model motion determining means comprises a means for determining the vehicle model motion on the basis of at least the drive manipulated variable and the vehicle model manipulation control input.

2. The control device for a vehicle according to claim 1, wherein the vehicle model manipulation control input is a virtual external force to be applied to a vehicle on the first vehicle model.

3. The control device for a vehicle according to claim 1, wherein the vehicle model manipulation control input comprises a manipulated variable of an actuator device on the first vehicle model.

4. The control device for a vehicle according to claim 1, wherein the actuator device control means comprises a means for determining an actual vehicle basic control input, which is a basic value of a control input specifying an operation of the actuator device on the basis of at least the drive manipulated variable,

the actual vehicle actuator manipulation control input comprises a correction amount for correcting the actual vehicle basic control input, and

the actuator device control means controls the actuator device on the basis of a control input obtained by correcting the determined actual vehicle basic control input by the actual vehicle actuator manipulation control input.

5. The control device for a vehicle according to claim 1, wherein the actuator device control means comprises a means for determining a road surface reaction force basic desired parameter that defines a basic desired value of a road surface reaction force to be applied to the vehicle on the basis of at least the drive manipulated variable,

the actual vehicle actuator control input comprises a correction parameter for correcting the road surface reaction force basic desired parameter, and

the actuator device control means controls the actuator device on the basis of a desired value of a road surface reaction force defined by a corrected parameter obtained by correcting the determined road surface reaction force basic desired parameter by the correction parameter.

6. The control device for a vehicle according to claim 4, wherein the vehicle model motion determining means comprises a means for determining a model basic control input, which is a basic value of a control input that defines an operation of the actuator device on the first vehicle model on the basis of at least the drive manipulated variable,

the vehicle model manipulation control input comprises a correction amount for correcting the model basic control input,

the vehicle model motion determining means comprises a means for determining the vehicle model motion by operating the actuator device on the first vehicle model on the basis of a manipulated variable obtained by correcting the determined model basic control input by the vehicle model manipulation control input, and

the model basic control input agrees with the actual vehicle basic control input.

7. The control device for a vehicle according to claim 5, wherein the vehicle model manipulation control input comprises a virtual external force to be applied to a vehicle on the first vehicle model,

the vehicle model motion determining means comprises a means for determining a model road surface reaction force parameter that defines a road surface reaction force to be applied to a vehicle on the first vehicle model on the basis of at least the drive manipulated variable, and a means for determining a motion of the first vehicle model by applying at least a road surface reaction force defined by the determined model road surface reaction force parameter and the virtual external force, which is the vehicle model manipulation control input, to the vehicle on the first vehicle model, and

a road surface reaction force defined by the model road surface reaction force parameter agrees with a basic desired value of the road surface reaction force defined by the road surface reaction force basic desired parameter.

8. The control device for a vehicle according to claim 5, wherein the state amount error reaction control means comprises a means for setting a permissible range of the road surface reaction force and determines an actuator manipulation control input serving as the correction parameter such that a permissible range condition in that a desired value of a road surface reaction force defined by a corrected parameter obtained by correcting a basic desired value of a road surface reaction force defined by the determined road surface reaction force basic desired parameter by the correction parameter falls within the permissible range is satisfied.

9. The control device for a vehicle according to claim 8, wherein the correction parameter comprises a parameter that defines a correction amount of a road surface reaction force acting on each of the wheels of a vehicle,

the road surface reaction force basic desired parameter comprises a parameter that defines a basic desired value of a road surface reaction force acting on each wheel, and

the permissible range comprises a permissible range of a road surface reaction force acting on each of the wheels.

10. The control device for a vehicle according to claim 9, wherein the state amount error reaction control means comprises a means for determining an error canceling compensation amount, which is an external force to be applied to a vehicle in order to bring the first state amount error close to zero, on the basis of the first state amount error, and determines the correction parameter such that a resultant force of the correction amounts of road surface reaction forces acting on the individual wheels defined by the correction parameters approximates the error canceling compensation amount while satisfying the permissible range condition.

11. The control device for a vehicle according to claim 10, wherein the vehicle model manipulation control input comprises a virtual external force to be applied to a vehicle on the first vehicle model, and the state amount error reaction control means comprises a means for determining the virtual external force as the vehicle model manipulation control input on the basis of a difference between the resultant force of the correction amounts of the road surface reaction forces and the error canceling compensation amount.

12. The control device for a vehicle according to claim 10, wherein the vehicle model manipulation control input comprises a manipulated variable of an actuator device on the first vehicle model, and the state amount error reaction control means comprises a means for determining the manipulated variable as the vehicle model manipulation control input on the basis of a difference between the resultant force of the correction amounts of the road surface reaction forces and the error canceling compensation amount.

13. The control device for a vehicle according to claim 4, comprising a future drive manipulated variable determining means for determining a future drive manipulated variable, which is a drive manipulated variable for a predetermined period including a period until after a predetermined time from current time, on the basis of at least the drive manipulated variable before the current time, and a future vehicle behavior predicting means for predicting a future behavior of the first vehicle model on the basis of at least the future drive manipulated variable, using a latest value of a state amount of the first vehicle model as a starting point,

wherein the actuator device control means determines the actual vehicle basic control input on the basis of a future behavior of the first vehicle model.

14. The control device for a vehicle according to claim 1, comprising:

a future drive manipulated variable determining means for determining a future drive manipulated variable, which is a drive manipulated variable for a predetermined period including a period until after a predetermined time from current time, on the basis of at least the drive manipulated variable before the current time; and

a future vehicle behavior predicting means for predicting future behaviors of the second vehicle model and a third vehicle model while determining a model control input, which is a control input defining an operation of an actuator device on the third vehicle model on the basis of at least a difference between a state amount of the second vehicle model and a state amount of the third vehicle model and the future drive manipulated variable at each time until after the predetermined time from the current time, taking a latest value of a state amount of the first vehicle model as the starting point of the state amount of the second vehicle model that represents the dynamic characteristics of the vehicle and by taking a latest value of an actual state amount of the vehicle as the starting point of the state amount of the third vehicle model that represents the dynamic characteristics of the vehicle,

wherein the actuator device control means determines the actual vehicle actuator manipulation control input on the basis of at least a future behavior of the third vehicle model.

15. The control device for a vehicle according to claim 4, comprising:

a future drive manipulated variable determining means for determining a future drive manipulated variable, which is a drive manipulated variable for a predetermined period including a period until after a predetermined time from current time, on the basis of at least the drive manipulated variable before the current time;

a reference motion state amount determining means for sequentially determining a state amount of a reference motion that the first vehicle model should follow by a reference dynamic characteristic model representing dynamic characteristics of the vehicle on the basis of at least the drive manipulated variable;

a future vehicle behavior predicting means for predicting future behaviors of the second vehicle model and a third vehicle model while determining a model control input, which is a control input defining an operation of an actuator device on the third vehicle model on the basis of at least a difference between a state amount of the second vehicle model and a state amount of the third vehicle model and the future drive manipulated variable at each time until after the predetermined time from the current time, a latest value of a state amount of the reference motion being the starting point of a state amount of the second vehicle model that represents the dynamic characteristics of the vehicle and a latest value of a state amount of the first vehicle model being the starting point of a state amount of the third vehicle model that represents the dynamic characteristics of the vehicle,

wherein the actuator device control means determines the actual vehicle basic control input on the basis of at least a future behavior of the third vehicle model.

16. The control device for a vehicle according to claim 15, wherein the reference motion state amount determining means determines a new state amount of the reference motion on the basis of at least a difference between the state amount of the first vehicle model and the state amount of the reference motion and the drive manipulated variable.

17. The control device for a vehicle according to claim 5, comprising:

a reference motion determining means for determining a reference motion, which is a reference motion relative to the vehicle model motion, on the basis of at least the drive manipulated variable; and

a means for determining a model restoring compensation amount, which is an external force to be applied to a vehicle to bring the second state amount error, which is a difference between a predetermined second state amount related to the determined reference motion and a predetermined second state amount related to the determined first vehicle model motion, close to zero, on the basis of the second state amount error,

wherein the means for determining the road surface reaction force basic desired parameter determines the road surface reaction force basic desired parameter on the basis of at least the model restoring compensation amount.

18. The control device for a vehicle according to claim 6, comprising a reference motion determining means for determining a reference motion, which is a reference motion relative to the vehicle model motion, on the basis of at least the drive manipulated variable,

wherein the means for determining the model basic control input determines the model basic control input on the basis of at least a second state amount error, which is a difference between a predetermined second state amount related to the determined reference motion and a predetermined second state amount related to the determined first vehicle model motion, such that the difference is brought close to zero.