Brake control apparatus and brake control method
First Claim
1. A brake control apparatus comprising:
- a master cylinder which supplies operating fluid in response to an operation of a brake pedal;
an accumulator that stores high pressure operating fluid;
a wheel cylinder at each wheel of a vehicle, which operates a brake provided at each wheel of the vehicle using the operating fluid supplied from the master cylinder or the accumulator;
a first communication path that connects the master cylinder with the wheel cylinder;
a master cutoff valve provided midway in the first communication path;
a second communication path that connects the accumulator with the wheel cylinder;
a pressure increase valve provided midway in the second communication path;
a power supply that supplies power to operate the master cutoff valve and the pressure increase valve;
a valve control portion that controls the supply of power from the power supply such that the master cutoff valve and the pressure increase valve operate in response to an operation of the brake pedal; and
a timing instructing portion that instructs the valve control portion to offset the timings at which the master cutoff valve and the pressure increase valve are operated.
1 Assignment
0 Petitions
Accused Products
Abstract
A wheel cylinder receives operating fluid supplied from a master cylinder or an accumulator and operates a brake provided on each wheel of a vehicle. A valve control portion operates a master cutoff valve and a pressure increase valve in response to an operation of a brake pedal. When the brake pedal is operated, an operation timing instructing portion first instructs the valve control portion to operate the master cutoff valve. A voltage recovery characteristics measuring portion measures a voltage recovery time that it takes for the voltage of a power supply to recover to a predetermined level from a temporary drop due to operation of the master cutoff valve. Then after the voltage recovery time has passed after the master cutoff valve was operated, the operation timing instructing device instructs the valve control portion to operate the pressure increase valve.
21 Citations
11 Claims
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1. A brake control apparatus comprising:
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a master cylinder which supplies operating fluid in response to an operation of a brake pedal;
an accumulator that stores high pressure operating fluid;
a wheel cylinder at each wheel of a vehicle, which operates a brake provided at each wheel of the vehicle using the operating fluid supplied from the master cylinder or the accumulator;
a first communication path that connects the master cylinder with the wheel cylinder;
a master cutoff valve provided midway in the first communication path;
a second communication path that connects the accumulator with the wheel cylinder;
a pressure increase valve provided midway in the second communication path;
a power supply that supplies power to operate the master cutoff valve and the pressure increase valve;
a valve control portion that controls the supply of power from the power supply such that the master cutoff valve and the pressure increase valve operate in response to an operation of the brake pedal; and
a timing instructing portion that instructs the valve control portion to offset the timings at which the master cutoff valve and the pressure increase valve are operated. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A brake control method comprising the steps of:
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supplying operating fluid with a master cylinder in response to an operation of a brake pedal;
storing high pressure operating fluid with an accumulator;
operating a wheel cylinder using the operating fluid supplied from the master cylinder or the accumulator so as to operate a brake provided at each wheel of a vehicle; and
controlling the supply of power from a power supply so as to offset the timings at which a master cutoff valve provided midway in a communication path between the master cylinder and the wheel cylinder and a pressure increase valve provided midway in a communication path between the accumulator and the wheel cylinder are operated. - View Dependent Claims (8, 9, 10, 11)
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Specification