Brake control apparatus
A technology of brake control and brake pedal, applied in the direction of brake transmission, foot start device, brake, etc., can solve the problem of increasing the burden on the driver, and achieve the effect of improving the pedal feel
Active Publication Date: 2011-07-27
HITACHI ASTEMO LTD
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Problems solved by technology
In particular, when the brake operation and the steering wheel operation are performed at the same time as deceleration when turning (curb), there is a problem that the burden on the driver is increased due to the increase in the number of control objects.
Method used
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Embodiment Construction
[0019] Hereinafter, embodiments will be described with reference to the drawings.
[0020] figure 1 is a top view of BBW's brake control unit, figure 2 It is a sectional view of the brake control device of BBW.
[0021] The brake control device of BBW includes: electric actuator 1 that generates hydraulic pressure for brake booster, brake pedal 2, brake pressure distribution device 3, brake piping 4, 5, piston (primary piston, secondary piston) 7, Tires (including calipers, rotors, wheels) 8 , reserve oil tank 9 , pedal reaction force generating mechanism 12 , stroke sensor 20 , lever 21 , spring 23 , and vehicle state information acquiring unit 30 . Here, the vehicle state information is information necessary for control such as vehicle speed and accelerator ON / OFF. In addition, the electric actuator 1 includes: a master cylinder 10, an electric booster cylinder 11 provided upstream of the master cylinder 10 and generating brake boosting, a stator 11A, a rotor 11B, and a ...
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Disclosed is a brake control apparatus which includes a brake booster for augmenting deceleration, and which addresses the problem in conventional brake control apparatuses that deceleration and pedal reaction force depend on driver brake pedal input, and thus the pedal response and the ride comfort from the feeling of deceleration are affected by the manner in which the brake pedal is actuated by the driver. The brake control apparatus comprises a pedal reaction force generation unit for generating a pedal reaction force on the brake pedal, and a brake control unit for controlling the brake force in such a way as to suppress driver brake input fluctuations, wherein the pedal reaction force generation unit suppresses pedal reaction force fluctuations in accordance with specific deceleration and pedal reaction force characteristics. The brake control apparatus further comprises a calculation unit for calculating a target deceleration on the basis of lateral acceleration information in the left-to-right direction of the vehicle, wherein the brake control unit suppresses the brake force in such a way that the target deceleration is produced and, when the amount by which the brake pedal is depressed reaches a specific amount in respect of the target deceleration, the pedal reaction force generated by the pedal reaction force generation unit may be increased.
Description
technical field [0001] The present invention relates to a brake control device having a booster for boosting the pedaling force of a brake pedal. Background technique [0002] When the vehicle is decelerating, the driver obtains the desired deceleration by stepping on the brake pedal. At this time, the driver receives a pedal reaction force corresponding to the stroke amount. In order to decelerate the vehicle smoothly, it is necessary to fine-tune the pedal reaction force and deceleration, and the comfort of the vehicle due to the feeling of deceleration depends on the skill of the driver. In recent years, attention has been paid to an electric brake system (hereinafter referred to as BBW) in which a vibration transmission system is interrupted by making the pedal mechanically independent, and the braking force and the pedal reaction force are variable (refer to Patent Document 1). [0003] prior art literature [0004] Patent Document 1: Japanese Patent Laid-Open No. 20...
Claims
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IPC IPC(8): B60T8/17B60T7/06B60T13/74
CPCB60T7/06B60T2220/06B60T13/746
Inventor 宫岛步荒井雅嗣印南敏之西野公雄松崎则和木川昌之山门诚
Owner HITACHI ASTEMO LTD