Brake force control apparatus
AssigneeKenyon & Kenyon
InventorsSATOSHI SHIMIZU, YOSHIYUKI HASHIMOTO
Life of this patent
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Abstract
When a normal braking is performed, a master cylinder (32) and wheel cylinders (44FR, 44FL, 44RR, 44RL) are set to a conducting state. When an emergency braking is performed, the master cylinder and the wheel cylinders are joined together so that a large brake force can be generated. If the wheel cylinders are connected to an accumulator soon after the emergency braking, an increase in the wheel cylinder pressure can be prevented. Even after the emergency braking, the wheel cylinders and the master cylinder are maintained in the conducting state while the master cylinder pressure is rapidly increasing.
Claims14
A brake force control apparatus having an operation fluid pressure generating mechanism (32;
- 206) generating an operation fluid pressure depending on a degree of operation of a brake pedal by a driver, a high-pressure source (12, 20;
- 226) generating a control fluid pressure higher than that of the fluid pressure generated by said operation fluid pressure generating mechanism, a switch mechanism (46, 48, 54;
- 214) for selectively connecting one of the operation fluid pressure generating mechanism to the high-pressure source and a wheel cylinder (44FR, 44FL, 44RR, 44RL;
- 218), and emergency braking detection means (102, 106) for detecting execution of an emergency braking, wherein when an emergency braking is performed by the driver, a brake assist control for boosting a wheel cylinder pressure is executed in such a way that the high-pressure source serves as a fluid pressure source, there are provided
- start timing detection means (104, 108, 110, 112, 114) for detecting, as a start timing, a time when a controlled pressure increasing slope obtained by boosting the wheel cylinder pressure with the high-pressure source used as the fluid pressure source exceeds a normal pressure increasing slope obtained by boosting the wheel cylinder pressure with the master cylinder used as the fluid pressure source, and
- brake assist control execution means (116;
- 120, 128) for starting the brake assist control after the emergency braking is detected and the start timing is then detected.
A brake force control apparatus having a high-pressure source (12, 20;
- 226) which generates a predetermined control fluid pressure, a front wheel fluid pressure control mechanism (46, 48) that controls a wheel cylinder pressure of front wheels with the high-pressure source used as a fluid pressure source, a rear wheel fluid pressure control mechanism (54) that controls a rear wheel cylinder pressure of rear wheels with the high-pressure source used as the fluid pressure source, and emergency braking detection means (102, 106) for detecting execution of an emergency braking, wherein when an emergency braking is performed by the driver, a brake assist control for generating a wheel cylinder pressure higher than that generated at a normal time, there are provided
- front wheel control execution means (120) for starting the brake assist control of the front wheels after the emergency braking is detected, and
- rear wheel control execution means (122, 124, 126, 128) for starting the brake assist control of the rear wheels when a predetermined rear wheel delay time (DR) elapses after the brake assist control of the front wheel is started.
Dependencies are inferred from the claim text.