35results about How to "Good pedal feel" patented technology

A brake control system includes a wheel cylinder, a brake pedal, a master cylinder in which communication between it and an external master cylinder reservoir is cut off when the operating amount of the brake pedal is equal to or greater than a predetermined value, an internal reservoir, and a pump which selectively discharges hydraulic fluid in two directions, one being a direction that increases the hydraulic pressure in the wheel cylinder by drawing up hydraulic fluid from the internal reservoir, and the other being a direction that stores hydraulic fluid in the internal reservoir. The pump is driven to discharge hydraulic fluid in the direction that stores hydraulic fluid when communication is open between the master cylinder and the master cylinder reservoir, and driven to discharge hydraulic fluid in the direction that increases the hydraulic pressure when communication is cut off between the master cylinder and the master cylinder reservoir. A further invention is directed to a brake control method.

In the negative pressure doubling device of the invention, a threshold line is set for starting a BA operation at a pedal stepping speed not less than a set speed, and the inclination of the threshold line is set equal to that for a servo ratio (SR2) smaller than a servo ratio (SR1) for normal brake operation in a low input region (small pedal stepping force region), while in a high input region (large pedal stepping force region) it is set equal to the size of a servo ratio (SR1) during normal brake operation. That is, the threshold line for starting the BA operation is adjustable for low input and high input. And even if the brake pedal is stepped at a stepping speed not less than the set speed in spite of not being in an emergency, the BA operation is not performed; thus, unnecessary BA operation is prevented. In an emergency and when the brake pedal is stepped at a stepping speed not less than the set speed and with more than a set stepping force, the BA operation is performed.

Provided are a vehicle braking system and a master cylinder which are capable of providing a good pedal feel. A valve-opening pressure for a pressure-reducing valve of the master cylinder is set higher than a hydraulic pressure which is obtained with a pressing force on a brake pedal being 500 N and lower than a hydraulic pressure obtained at a time when a booster reaches a full-load point in case of failure of the booster so as to be specialized for improving pedal feel. Required performance in case of failure of the booster is realized by a pressure-intensifying unit.

A method for operating a brake system of a motor vehicle, prefilling taking place to at least partially overcome an air gap of one wheel brake or a plurality of wheel brakes if the air gap of at least one wheel brake is increased, in particular as a result of dynamic influences of the vehicle motion.

The invention relates to a hydraulic coupling electronic hydraulic braking system. The purpose is to solve some problems existing in the current electronic hydraulic braking system. The invention includes a manpower hydraulic cylinder, a booster hydraulic cylinder, a brake master cylinder, a brake pedal, a pedal travel sensor, a booster motor, a booster transmission component, a normally open solenoid valve, Normally closed solenoid valve, one-way valve A, one-way valve B, hydraulic control unit HCU, hydraulic pressure sensor, electric control unit ECU and other structures, the invention has three working modes of conventional braking, active braking and failure backup. The present invention adopts a new type of hydraulic coupling scheme, cancels the reaction disc structure, and the driver's pedal force and brake booster are coupled through a hydraulic method. Since the reaction disc structure is cancelled, the control algorithm of the entire braking system is simplified , for easy control.

The invention provides a pedal lever ratio adjusting control method and system. The control method includes the following steps: powering a vehicle on; starting a lever ratio adjusting function; collecting and judging whether speed information and shift information accord with requirements; driving a pivot shaft of a pedal arm to slide if the speed information and the shift information accord withthe requirements; changing the position of the pivot shaft corresponding to a vehicle body; keeping the position of a pedal corresponding to the vehicle body unchanged; and adjusting the lever ratioof the pedal. The control method can adjust the lever ratio of the pedal and keep the position of the pedal corresponding to the vehicle body unchanged, so that the time-consuming and labor-consumingdeficiencies of manually adjusting can be overcome, matching time can be saved, and optimal pedal feelings can be realized; and the control method is suitable for adjusting with the individual difference of drivers, so that the method is good in universality, and can effectively guarantee the driving safety of the drivers.

The invention relates to an energy feedback type active brake system with failure protection capability and a control method. The energy feedback type active brake system with the failure protection capability comprises an oil cup, a pedal power assisting mechanism, a brake master cylinder, a brake pedal, a pedal simulator, a servo pressure control module, a brake wheel cylinder and a braking controller; a mechanical input end of the brake master cylinder is connected with the brake pedal through the pedal power assisting mechanism; an inlet of the brake main cylinder is connected with the oilcup through an oil passage; an outlet of the brake main cylinder is correspondingly connected with the pedal simulator and the brake wheel cylinder through the servo pressure control module; the servo pressure control module is connected with the oil cup through an oil passage and is also connected with the braking controller through a signal wire; and the braking controller is used for controlling the servo pressure control module to realize switching of the system among an active pressure control state, a brake energy recovery state and a failure protection state. The energy feedback type active brake system with the failure protection capability can be widely applied to the field of vehicle hydraulic active braking control.

The invention provides a braking energy recovery control method for an electric vehicle, which includes determining the driving condition of the electric vehicle according to the accelerator pedal information and the brake pedal information; and performing coasting braking when the driving condition of the electric vehicle is a coasting condition energy recovery; when the driving condition of the electric vehicle is the braking condition, the braking strategy of the electric vehicle is determined according to the opening of the brake pedal; When the electric vehicle is braking, the anti-drag torque of the motor is obtained according to the braking deceleration information and the steering wheel angle information, and the motor is controlled according to the anti-drag torque. This scheme determines the driving condition of the electric vehicle according to the information of the accelerator pedal and the brake pedal, and then requests the anti-drag torque of the motor for the sliding and braking conditions, and uses the anti-drag torque to brake the electric vehicle . By requesting different motor anti-drag torques according to different working conditions, the efficiency of energy recovery can be improved.

The invention discloses a regenerative braking system and a regenerative braking method for an electric vehicle. According to the technical scheme, when a driver brakes, requirements on a braking torque are calculated through a pressure sensor in an ESC (Electronic Stability Control), a regenerative braking torque which can be provided by the electric vehicle is obtained through a CAN (Controller Area Network), and depressurization or pressurization is judged through the required braking torque and the regenerative braking torque. According to the technical scheme, the braking torque is finely controlled, the driver feels comfortable when braking and feels good when stepping on a pedal, and energy is fully recovered.

The invention relates to an automobile composite braking system, comprising a hydraulic braking subsystem and a motor braking subsystem, wherein the hydraulic braking subsystem is composed of a pedal brake valve, a pressure retention mechanism, a pressure regulating mechanism, an ABS / ESP hydraulic valve block and a braking controller; the P port of the pedal brake valve is connected with the oil circuit at the outlet of a high pressure accumulator, the T port thereof is connected with the oil circuit of a liquid storage pot, and the A port is connected with the oil circuit of the pressure regulating mechanism; the pressure regulating mechanism is connected with the ABS / ESP hydraulic valve block and the oil circuit of the liquid storage pot; the braking controller is connected with the pressure regulating mechanism, a braking pedal displacement sensor, a wheel speed sensor and a pressure sensor circuit on the oil circuit; and the motor braking subsystem is composed of a motor, a derailleur, a motor controller and batteries. The pressure regulating mechanism can be formed by a two-position two-way normally closed valve and a normally opened valve, and also can be an independent tri-way normally opened electro-hydraulic proportional valve. The motor braking subsystem is supplied with braking force from the hydraulic braking subsystem when braking force thereof is insufficient. The invention can be used in a hybrid electric vehicle, a pure electric vehicle and a fuel cell electric vehicle.