Vehicle control apparatus and vehicle control system

Patent metadata

Field	Value
Publication number	US-2016272176-A1
Application number	US-201415033985-A
Country	US
Kind code	A1
Filing date	Nov 11, 2014
Priority date	Nov 12, 2013
Publication date	Sep 22, 2016
Grant date	—

Abstract

An object of the present invention is to provide a vehicle control system capable of utilizing another braking apparatus than a hydraulic brake even when an ABS is activated. A vehicle control system, which is configured to be used together with a vehicle, includes a regenerative braking apparatus capable of generating a regenerative braking torque at a wheel, another braking apparatus than the regenerative braking apparatus and capable of generating a braking torque at the wheel, and a braking torque calculation unit configured to calculate a required braking torque for each of wheels of the vehicle when the wheel slips. The vehicle control system realizes the calculated braking torque by the regenerative braking apparatus and the other braking apparatus.

First claim

1 . A vehicle control apparatus configured to be used together with a vehicle, the vehicle control apparatus comprising:
a braking torque calculation unit configured to calculate a required braking torque for each of wheels of the vehicle when a wheel slips; a hydraulic control apparatus including a hydraulic anti-lock control unit configured to adjust a wheel cylinder hydraulic pressure by applying the calculated braking torque; and a braking apparatus provided separately from the hydraulic control apparatus and configured to generate a second braking torque, wherein the hydraulic control apparatus and the braking apparatus are connected to each other so as to be able to communicate a result output by the braking torque calculation unit, wherein the hydraulic control apparatus transmits the calculated braking torque to the braking apparatus, and wherein the braking apparatus includes a braking apparatus anti-lock control unit configured to generate the second braking torque based on the acquired calculated braking torque.

2 . The vehicle control apparatus according to claim 1 , wherein the braking apparatus generates a smallest braking torque of the acquired braking torques for the wheels at each of the wheels as the second braking torque.

3 . The vehicle control apparatus according to claim 2 , wherein the hydraulic control apparatus transmits the smallest braking torque of the calculated braking torques for the individual wheels to the braking apparatus, and the braking apparatus generates the acquired smallest braking torque at each of the wheels as the second braking torque.

4 . The vehicle control apparatus according to claim 1 , wherein the braking apparatus is a regenerative braking apparatus configured to generate an electric braking torque.

5 . The vehicle control apparatus according to claim 4 , wherein the hydraulic control apparatus transmits a minimum braking torque between braking torques for predetermined regenerative wheels of the wheels.

6 . The vehicle control apparatus according to claim 4 , wherein, when the wheel slips while the hydraulic control apparatus and the regenerative braking apparatus each generate a braking torque, the braking torque generated by the regenerative braking apparatus is reduced earlier than the braking torque generated by the hydraulic control apparatus is reduced.

7 . The vehicle control apparatus according to claim 4 , wherein a driving torque is transmitted as the braking torque transmitted to the regenerative braking apparatus when the regenerative wheel largely slips.

8 . The vehicle control apparatus according to claim 1 , further comprising:
a braking booster configured to create a master cylinder hydraulic pressure according to the operation of a brake pedal by a driver; and a regenerative braking apparatus configured to generate an electric braking torque, wherein the braking booster transmits a smallest braking torque of the braking torques for the individual wheels that are acquired from the hydraulic control apparatus to the regenerative braking apparatus as the second braking torque.

9 . The vehicle control apparatus according to claim 1 , wherein the braking apparatus is an electric parking brake apparatus mounted on each of predetermined wheels of the wheels and configured to electrically press a brake pad against a disk brake mounted on each of the wheels according to the operation of a switch, and
wherein the hydraulic control apparatus transmits a minimum braking torque between the braking torques for the wheels with the electric parking apparatus mounted thereon that are predetermined in the wheels.

10 . The vehicle control apparatus according to claim 1 , wherein the braking apparatus includes
an electric parking brake apparatus mounted on each of predetermined wheels of the wheels and configured to electrically press a brake pad against a disk brake mounted on each of the wheels according to the operation of a switch, and a regenerative braking apparatus configured to generate an electric braking torque.

11 . The vehicle control apparatus according to claim 10 , wherein, when both the electric parking apparatus and the regenerative braking apparatus as the braking apparatus are activated and generate braking forces at same wheels, the hydraulic control apparatus transmits a smallest braking force of the wheels where the braking forces are generated to the braking apparatus.

12 . The vehicle control apparatus according to claim 10 , wherein, when both the electric parking apparatus and the regenerative braking apparatus as the braking apparatus are activated and generate the braking forces at different wheels, the hydraulic control apparatus transmits smallest braking forces of the respective wheels where the braking forces are generated by the electric parking apparatus and the regenerative braking apparatus as the braking apparatus to the braking apparatus.

13 . The vehicle control apparatus according to claim 1 , further comprising a road surface friction calculation unit configured to calculate a road surface frictional coefficient while the vehicle is running,
wherein the braking torque includes a braking torque corresponding to road surface friction that is set according to the calculated road surface frictional coefficient.

14 . The vehicle control apparatus according to claim 13 , wherein the hydraulic anti-lock control unit causes the hydraulic control apparatus to increase and/or decrease a braking torque acquired by subtracting the braking torque corresponding to the road surface friction from the braking torque.

15 . The vehicle control apparatus according to claim 1 , further a v b at on detection unit configured to detect a vibration of the wheel or a vehicle body including the wheel,
wherein hydraulic control apparatus reduces the braking torque if the vibration is detected by the vibration detection unit.

16 . The vehicle control apparatus according to claim further comprising:
first slip rate for triggering intervention of t hydraulic anti-lock control unit in anti lock control; a second slip rate for triggering intervention of the braking apparatus anti-lock control unit in the anti-lock control, the second slip rate being a lower slip rate than first slip rate.

17 . The vehicle control apparatus according to claim 1 , wherein in the braking torque transmitted to the braking apparatus, the incremental, gradient of the braking torque is less than the decremental gradient thereof.

18 . A vehicle control apparatus comprising:
a braking torque calculation unit configured to calculate a braking torque required to be applied to each of wheels of vehicle when the heel slips; a hydraulic anti lock control unit configured to adjust wheel cylinder hydraulic pressure by applying the calculated braking torque; and a braking torque transmission unit configured to transmit the braking torque calculated by the braking torque configured to generate a regenerative braking torque at the wheel.

19 . A vehicle control apparatus comprising:
a braking torque calculation unit configured to calculate a braking torque required to be applied to each of wheels of a vehicle when the wheel slips; a hydraulic anti-lock control unit configured to adjust a wheel cylinder hydraulic pressure by applying the calculated braking torque; and a braking torque transmission unit configured to transmit the braking torque calculated by the braking torque calculation unit to a braking apparatus configured to generate a second braking torque at the wheel.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Furuyama Hiroshi

Classifications

• B60T8/1761 Primary

  responsive to wheel or brake dynamics, e.g. wheel slip, wheel acceleration or rate of change of brake fluid pressure · CPC title

• B60T8/17616 Primary

  Microprocessor-based systems · CPC title

• B60T2270/602

  ABS features related thereto · CPC title