Vehicle motion control apparatus and vehicle motion control system

• US 9,090,258 B2
• Filed: 05/11/2011
• Issued: 07/28/2015
• Est. Priority Date: 05/11/2011
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: Takahashi, Junya, Yamakado, Makoto, Saito, Shinjiro
• Primary Examiner(s): Dager, Jonathan M
• Application Number:
  US14/116,701
• Publication Number:
  US 20140180554A1
• Time in Patent Office: 1,539 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2520/125 Lateral acceleration
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2720/106 Longitudinal acceleration
• CPC Class Codes: B60W 30/02 Control of vehicle driving stability
• CPC Class Codes: B60W 30/143 Speed control B60W30/16 takes precedence
• CPC Class Codes: B60W 30/18009 related to particular drive situations
• CPC Class Codes: B60W 30/18145 Cornering
• CPC Class Codes: B60W 40/10 related to vehicle motion

Abstract

In order to propose a vehicle motion control apparatus providing a good operability for a driver and capable of reducing a pedal operation, motional state information acquiring means configured to acquire longitudinal acceleration, lateral acceleration, and a vehicle speed generated in a vehicle; pedal operating amount acquiring means configured to acquire pedal operation information performed by the driver; and vehicle motion control command calculating means configured to calculate a longitudinal acceleration command value on the basis of information acquired therefrom and output a command value realizing the calculated longitudinal acceleration command value are provided, and the vehicle motion control command calculating means is configured to calculate the longitudinal acceleration command value on the basis of the acquired information so as to generate longitudinal acceleration which provides a longitudinal jerk of a value comparable to a longitudinal jerk on the basis of a pedal opening operation performed by the driver.

Claims

1. A vehicle motion control apparatus, comprising:

motional state information acquiring means configured to acquire a first longitudinal acceleration, a lateral acceleration and a vehicle speed of a vehicle;

pedal operating amount acquiring means configured to acquire information on a pedal operation performed by a driver;

vehicle motion control command calculating means configured to;

calculate a longitudinal acceleration command value on the basis of information acquired from the motional state information acquiring means and the pedal operating amount acquiring means, and

output a command value indicating the calculated longitudinal acceleration command value,

wherein

when a quantity of pedal operation is zero, a second longitudinal acceleration is generated based on the calculated longitudinal acceleration command value and a first longitudinal jerk generated on the basis of a pedal opening operation performed by the driver, such that the second longitudinal acceleration provides a second longitudinal jerk having a value comparable to the first longitudinal jerk.

2. The vehicle motion control apparatus according to claim 1, wherein an absolute value of the calculated longitudinal acceleration command value increases with an increase of an absolute value of the first longitudinal jerk generated on the basis of the pedal opening operation performed by the driver.

3. The vehicle motion control apparatus according to claim 1, wherein the vehicle motion control command calculating means changes an absolute value of the longitudinal acceleration command value on the basis of a lateral jerk acquired by the motional state information acquiring means or calculated from the information acquired from the motional state information acquiring means and the pedal operating amount acquiring means.

4. The vehicle motion control apparatus according to claim 1, wherein when the longitudinal acceleration command value is a negative value and the vehicle speed acquired by the motional state information acquiring means is not higher than a predetermined vehicle speed, an absolute value of the longitudinal acceleration command value is reduced with a reduction of the vehicle speed.

5. The vehicle motion control apparatus according to claim 1, wherein when the longitudinal acceleration command value is a negative value, and when an absolute value of a brake-based longitudinal acceleration required value generated by a brake pedal operation amount generated from the pedal operation information is not less than an absolute value of the longitudinal acceleration command value, the absolute value of the longitudinal acceleration command value is reduced on the basis of the reduction of the brake pedal operation amount.

6. The vehicle motion control apparatus according to claim 1, wherein when the longitudinal acceleration command value is a positive value, an absolute value of the longitudinal acceleration command value is reduced with a reduction of a value obtained by subtracting the vehicle speed acquired by the motional state information acquiring means from a preset target vehicle speed on the basis of the first longitudinal jerk generated on the basis of the pedal opening operation performed by the driver.

7. The vehicle motion control apparatus according to claim 1, wherein when the longitudinal acceleration command value is a positive value, a longitudinal jerk required value is generated on the basis of a brake pedal operating speed generated from a brake pedal operating amount generated from the pedal operation information, and the longitudinal acceleration command value is generated on the basis of the longitudinal jerk required value.

8. The vehicle motion control apparatus according to claim 1, wherein the vehicle motion control command calculating means calculates the longitudinal acceleration command value by:

calculating a longitudinal jerk command value generated on the basis of a third longitudinal jerk estimated from an accelerator pedal opening operation performed by the driver, an accelerator-based longitudinal jerk required value generated on the basis of a fourth longitudinal jerk estimated from an accelerator pedal pressing operation performed by the driver, a brake-based longitudinal jerk required value generated on the basis of a fifth longitudinal jerk estimated from a brake pedal pressing operation performed by the driver, and a lateral jerk-based longitudinal jerk required value created on the basis of a temporal change of a lateral jerk-based longitudinal acceleration required value created on the basis of a lateral jerk generated by a handle operation performed by the driver, and

performing temporal integration on a value obtained by adding the calculated longitudinal jerk command value, the calculated accelerator-based longitudinal jerk required value, the calculated brake-based longitudinal jerk required value, and the calculated lateral jerk-based longitudinal jerk required value.

9. The vehicle motion control apparatus according to claim 1, wherein the vehicle motion control command calculating means calculates a deceleration-based negative longitudinal acceleration command value on the basis of a longitudinal jerk generated by an accelerator pedal operation performed by the driver.

10. The vehicle motion control apparatus according to claim 1, wherein the vehicle motion control command calculating means is configured to:

calculate, when the longitudinal acceleration command value is a negative value, a longitudinal jerk required value on the basis of an accelerator pedal operating amount generated from the pedal operating information acquired by the pedal operating amount acquiring means, and

change the longitudinal acceleration command value on the basis of the calculated longitudinal jerk required value.

11. The vehicle motion control apparatus according to claim 1, wherein the vehicle motion control command calculating means is configured to:

calculate, when the longitudinal acceleration command value is a negative value, a longitudinal acceleration required value on the basis of a brake pedal operating amount generated from the pedal operation information acquired by the pedal operating amount acquiring means,

calculate, when an absolute value of the calculated longitudinal acceleration required value is not lower than an absolute value of the longitudinal acceleration command value, a longitudinal jerk required value on the basis of a temporal change of the longitudinal acceleration required value, and

change the longitudinal acceleration command value on the basis of the calculated longitudinal jerk required value.

12. The vehicle motion control apparatus according to claim 3, wherein the vehicle motion control command calculating means is configured to:

calculate, when the longitudinal acceleration command value is a negative value, a longitudinal acceleration required value on the basis of the lateral jerk,

calculate, when an absolute value of the calculated longitudinal acceleration required value is not lower than the absolute value of the longitudinal acceleration command value, a longitudinal jerk required value from a temporal change of the longitudinal acceleration required value, and

change the longitudinal acceleration command value on the basis of the calculated longitudinal jerk required value.

13. The vehicle motion control apparatus according to claim 1, wherein:

the motional state information acquiring means includes;

acceleration and jerk information acquiring means configured to acquire anyone of the first longitudinal acceleration, the lateral acceleration, the first longitudinal jerk and a lateral jerk of the vehicle; and

vehicle speed acquiring means configured to acquire the vehicle speed of the vehicle,

the pedal operating amount acquiring means includes;

accelerator pedal operating amount acquiring means configured to acquire an accelerator pedal stroke performed by the driver; and

brake pedal operating amount acquiring means configured to acquire a brake pressure applied by the driver, and

the pedal operation information includes the accelerator pedal stroke and the brake pressure.

14. The vehicle motion control apparatus according to claim 13, further comprising:

longitudinal acceleration control detecting means configured to detect ON or OFF of longitudinal acceleration control and output a longitudinal acceleration control detection signal.

15. The vehicle motion control apparatus according to claim 14, wherein the vehicle motion control command calculating means is configured to:

acquire the first longitudinal acceleration, the lateral acceleration, the vehicle speed, the accelerator pedal stroke, the brake pressure, and the longitudinal acceleration control detection signal,

calculate the first longitudinal jerk and the lateral jerk from the first longitudinal acceleration, the lateral acceleration, and the vehicle speed,

calculate an accelerator pedal operating amount and a brake pedal operating amount from the accelerator pedal stroke and the brake pressure,

generate a longitudinal acceleration control permission flag on the basis of the vehicle speed and the longitudinal acceleration control detection signal,

calculate the longitudinal acceleration command value on the basis of the vehicle speed, a value of the longitudinal acceleration control permission flag, the first longitudinal jerk, and the lateral jerk, and

output a command value on the basis of the longitudinal acceleration command value on the basis of the value of the longitudinal acceleration control permission flag.

16. A vehicle motion control system, comprising a vehicle motion control apparatus,

the vehicle motion control apparatus including:

motional state information acquiring means configured to acquire a first longitudinal acceleration, a lateral acceleration and a vehicle speed of a vehicle;

pedal operating amount acquiring means configured to acquire information on pedal operation performed by a driver;

vehicle motion control command calculating means configured to calculate a longitudinal acceleration command value on the basis of information acquired from the motional state information acquiring means and the pedal operation amount acquiring means and output a command value indicating the calculated longitudinal acceleration command value;

longitudinal acceleration generating means configured to perform longitudinal acceleration control on the vehicle on the basis of the command value output from the vehicle motion control command calculating means; and

longitudinal acceleration control state display means configured to indicate information recognizable by the driver on the basis of the command value output from the vehicle motion control command calculating means,

wherein when a quantity of pedal operation is zero, a second longitudinal acceleration is generated based on the calculated longitudinal acceleration command value and a first longitudinal jerk generated on the basis of a pedal opening operation performed by the driver, such that the second longitudinal acceleration provides a second longitudinal jerk having a value comparable to the first longitudinal jerk.

17. The vehicle motion control system according to claim 16, further comprising:

a vehicle control apparatus configured to receive an input of the command value output from the vehicle motion control command calculating means, generate and output a drive signal for driving the longitudinal acceleration generating means and the longitudinal acceleration control state display means on the basis of the input command value.

18. The vehicle motion control system according to claim 16, wherein the vehicle motion control apparatus is configured to control such that an absolute value of the calculated longitudinal acceleration command value increases with an increase of an absolute value of the first longitudinal jerk generated on the basis of the pedal opening operation performed by the driver.

19. The vehicle motion control system according to claim 16, wherein the vehicle motion control command calculating means of the vehicle motion control apparatus is configured to change an absolute value of the longitudinal acceleration command value on the basis of a lateral jerk acquired by the motional state information acquiring means or calculated from the information acquired from the motional state information acquiring means and the pedal operating amount acquiring means.

20. The vehicle motion control system according to claim 16, wherein the vehicle motion control command calculating means of the vehicle motion control apparatus is configured to calculate a negative longitudinal acceleration command value on the basis of a longitudinal jerk generated by an accelerator pedal operation performed by the driver.