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US 7,063,393 B2Granted
Electronic brake system without pump unit
AssigneesAdvics Co., Ltd., Denso Corporation
InventorsMotoshi Suzuki, Haruo Arakawa, Takayuki Takeshita, Takahisa Yokoyama
Life of this patent
Estimating the term…
Abstract
In an electronic brake system, a brake pedal is operated by a driver according to a requisite braking force. Wheel cylinders equipped at respective vehicle wheels generate braking forces at the respective vehicle wheels. A master cylinder applies a brake fluid pressure to generate the respective wheel cylinder pressures. A pedal operation amount detection portion detects a stroke amount of the brake pedal. The brake pedal and the master cylinder are isolated from each other. The motor is driven based on the pedal operation amount detected by the pedal operation amount detection portion and then controls the brake fluid pressure.
Claims24
An electronic brake system including:
- a brake pedal operable according to a requisite braking force;
- a failsafe cylinder for generating a brake fluid pressure in conjunction with operation of the brake pedal;
- wheel cylinders equipped at respective vehicle wheels, for generating respective braking forces at the respective vehicle wheels;
- a master cylinder for generating brake fluid pressure and applying the brake fluid pressure to the wheel cylinders to generate the respective wheel pressures;
- and
- a motor for controlling the brake fluid pressure in the master cylinder;
- wherein the electronic brake system is operative in a first operational mode and a second operational mode is operative,
- in the first operational mode, brake fluid pressures in the wheel cylinders are generated based on the brake fluid pressure in the master cylinder with driving of the motor, and
- in the second operational mode, the brake fluid pressures in the wheel cylinders are generated based on the brake fluid pressure generated in the failsafe cylinder without driving the motor;
- and, in the second operational mode, the brake fluid pressure in the master cylinder is controlled by the brake fluid pressure generated in the failsafe cylinder, and the controlled brake fluid pressure in the master cylinder is provided to the wheel cylinders to control the respective brake fluid pressures in the wheel cylinders.
7 more elements
An electronic brake system comprising:
- a brake pedal operable according to a requisite braking force;
- a failsafe cylinder for generating a brake fluid pressure in conjunction with operation of the brake pedal;
- wheel cylinders equipped at respective vehicle wheels, for generating respective braking forces at the respective vehicle wheels;
- a master cylinder for generating brake fluid pressure and applying the brake fluid pressure to the wheel cylinders to generate the respective wheel pressures;
- and
- a motor for controlling the brake fluid pressure in the master cylinder;
- wherein the electronic brake system is operative in a first operational made and a second operational mode is operative,
- in the first operational mode, brake fluid pressure in the wheel cylinders are generated based on the brake fluid pressure in the master cylinder with driving of the motor, and
- in the second operational mode, the brake fluid pressures in the wheel cylinders are generated based on the brake fluid pressure generated in the failsafe cylinder without driving the motor,
- a gear unit for converting rotational power generated by the motor to linear motion,
- wherein a piston rod equipped in the master cylinder is driven by the motor through the gear unit,
- wherein the piston rod includes a first portion connected to a first master piston and a second portion jointed to the gear unit, the first portion and the second portion are separable from each other.
9 more elements
An electronic brake system comprising:
- a brake pedal operable according to a requisite braking force;
- a failsafe cylinder for generating a brake fluid pressure in conjunction with operation of the brake pedal;
- wheel cylinders equipped at respective vehicle wheels, for generating respective braking faces at the respective vehicle wheels;
- a master cylinder far generating brake fluid pressure and applying the brake fluid pressure to the wheel cylinders to generate the respective wheel pressures;
- and
- a motor for controlling the brake fluid pressure in the master cylinder;
- wherein the electronic brake system acts in a first operational mode and a second operational mode,
- in the first operational mode, brake fluid pressure in the wheel cylinders are generated based on the brake fluid pressure in the master cylinder by driving of the motor, and
- in the second operational mode, the brake fluid pressure generated in the failsafe cylinder is provided to the brake fluid pressures in the wheel cylinders without driving of the motor,
- a change valve for selecting the master cylinder the failsafe cylinder as a brake fluid pressure provision resource to the wheel cylinders;
- wherein the failsafe cylinder includes a piston for being driven by the operation of the brake pedal and a cylinder portion for accommodating piston, the failsafe cylinder generates the brake fluid pressure based on a movement of the piston,
- the master cylinder includes first and second master pistons, a cylinder portion for accommodating the first and second master pistons, and first and second chambers formed by the first and second master pistons and the cylinder portion,
- in the first operational mode, the brake fluid pressure in the first and second chambers of the master cylinder are controlled based on the movement of the first and second master pistons by driving of the motor, and the change valve selects the master cylinder as the brake fluid pressure provision resource to the wheel cylinders, and
- in the second operational mode, the change valve selects the failsafe cylinder as a brake fluid pressure provision resource to the wheel cylinders.
11 more elements
Dependencies are inferred from the claim text.