Operation control system for vehicle, vehicle, and program

Patent metadata

Field	Value
Publication number	US-9919603-B2
Application number	US-201515116707-A
Country	US
Kind code	B2
Filing date	Jan 28, 2015
Priority date	Mar 31, 2014
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

The present invention improves emergency evasion performance. An operation control system for a vehicle that is provided with a risk-potential determining unit that determines the risk potential of a vehicle on the basis of external environment information and/or vehicle information, a friction braking unit that applies friction braking force to the vehicle, and a regenerative braking device that applies regenerative braking force to the vehicle, the operation control system being provided with a control value determining unit that determines a first control value that is for determining the size of the friction braking force and determines a second control value that is for determining the size of the regenerative braking force. The control value determining unit determines at least the first control value on the basis of the risk potential determined by the risk-potential determining unit.

First claim

The invention claimed is:

1. An operation control system for a vehicle, comprising:
a risk-potential determining unit determining a risk potential of a vehicle on the basis of at least one of external environment information and vehicle information;
a friction braking device giving a friction braking force to the vehicle; and
a regenerative braking device giving a regenerative braking force to the vehicle,
wherein the operation control system comprises a control value determining unit determining a first control value for determining a magnitude of the friction braking force and a second control value for determining a magnitude of the regenerative braking force, and
the control value determining unit determines at least the first control value on the basis of a risk potential determined by the risk-potential determining unit.

2. The operation control system for the vehicle according to claim 1 , wherein in a case where the risk potential determined by the risk-potential determining unit becomes higher, the control value determining unit determines the first control value so that the magnitude of the friction braking force becomes larger.

3. The operation control system for the vehicle according to claim 2 , wherein the control value determining unit is a ratio determining unit determining a distribution ratio of the friction braking force as the first control value and determining a distribution ratio of the regenerative braking force as the second control value in order to distribute a braking force applied to the vehicle to the friction braking force and the regenerative braking force,
in a case where the risk potential determined by the risk-potential determining unit is less than a predetermined value, the ratio determining unit lets the distribution ratio of the friction braking force be a value less than the distribution ratio of the regenerative braking force, and
in a case where the risk potential determined by the risk-potential determining unit is higher than a predetermined value, the ratio determining unit lets the distribution ratio of the friction braking force be a value larger than the distribution ratio of the regenerative braking force.

4. The operation control system for the vehicle according to claim 2 , wherein in a case where the risk potential determined by the risk-potential determining unit becomes higher, the control value determining unit determines the second control value so that a magnitude of the regenerative braking force becomes smaller.

5. The operation control system for the vehicle according to claim 1 , to comprising a braking wheel control unit increasing a number of wheels, to which the braking force is applied, in a case where the risk potential determined by the risk-potential determining unit becomes higher.

6. The operation control system for the vehicle according to claim 1 , to comprising:
a deceleration determining unit determining a deceleration of the vehicle on the basis of the risk potential determined by the risk-potential determining unit; and
a braking force determining unit determining the magnitude of the friction braking force on the basis of the deceleration and the first control value, and determining the magnitude of the regenerative braking force on the basis of the deceleration and the second control value.

7. The operation control system for the vehicle according to claim 6 , wherein the deceleration determined by the deceleration determining unit becomes higher as the risk potential becomes higher.

8. The operation control system for the vehicle according to claim 1 , comprising:
a deceleration determining unit determining the deceleration of the vehicle on the basis of one of or both of a steering operation for the vehicle and a lateral motion of the vehicle; and
a braking force determining unit determining the magnitude of the friction braking force on the basis of the deceleration and the first control value, and determining the magnitude of the regenerative braking force on the basis of the deceleration and the second control value.

9. The operation control system for the vehicle according to claim 1 , to wherein an external environment information obtaining unit obtaining the external environment information is constituted by at least one of a vehicle front information detection unit detecting information about an object existing in front of the vehicle, an inter-vehicle communication unit receiving information about another vehicle existing around the vehicle, and a road-vehicle communication unit receiving environment information in front of the vehicle, and
a vehicle information obtaining unit obtaining the vehicle information is constituted by at least one of a vehicle speed detection unit detecting a vehicle speed of the vehicle, a steering angle detection unit detecting a steering angle of the vehicle, an acceleration detection unit detecting an acceleration of the vehicle, a yawrate detection unit detecting a yawrate of the vehicle, an acceleration operation speed detection unit detecting an operation speed of an acceleration pedal of the vehicle, and a brake operation speed detection unit detecting an operation speed of a brake pedal of the vehicle.

10. The operation control system for the vehicle according to claim 1 , wherein the risk-potential determining unit determines the risk potential on the basis of at least one of a time-to-collision between the vehicle and an obstacle, a steering angle of the vehicle, a deviation between an estimated value of a lateral motion of the vehicle and an actually-measured value.

11. The operation control system for the vehicle according to claim 1 , to comprising:
a first storage unit previously storing characteristics of the first control value that becomes larger as the risk potential becomes higher,
wherein the control value determining unit determines the first control value corresponding to the risk potential on the basis of a characteristic of the first control value stored in the first storage unit.

12. The operation control system for the vehicle according to claim 8 , comprising:
a gain storage unit previously storing a characteristic of a gain that becomes larger as the risk potential becomes higher,
wherein the deceleration determining unit includes:
a first deceleration determining unit determining a first deceleration of the vehicle on the basis of the risk potential;
a gain determining unit determining the gain corresponding to the risk potential on the basis of the characteristic of the gain stored in the gain storage unit; and
a second deceleration determining unit determining a second deceleration by multiplying the first deceleration determined by the first deceleration determining unit by the gain determined by the gain determining unit, and
the braking force determining unit determines the magnitude of the friction braking force on the basis of the second deceleration and the first control value, and determines the magnitude of the regenerative braking force on the basis of the second deceleration and the second control value.

13. The operation control system for the vehicle according to claim 8 , comprising:
a lateral acceleration detection unit detecting a lateral acceleration of the vehicle,
wherein the deceleration determining unit is a longitudinal acceleration determining unit for determining a longitudinal acceleration for decelerating the vehicle as an absolute value of a lateral acceleration of the vehicle increases, and accelerating the vehicle as the absolute value of the lateral acceleration of the vehicle decreases.

14. The operation control system for the vehicle accordi

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Yamakado Makoto
• Nagatsuka Keiichiro
• Takahashi Junya
• Sasaki Mitsuhide
• Innami Toshiyuki
• Ueyama Mikio

Classifications

• B60L3/108

  whilst braking, i.e. ABS · CPC title

• Y02T10/72

  Electric energy management in electromobility · CPC title

• B60T7/22

  initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle {, or by means of contactless obstacle detectors mounted on the vehicle} · CPC title

• B60L15/20

  for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed · CPC title

• B60L2240/465

  Slip · CPC title