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

The invention belongs to the technical field of automobile braking systems and discloses an electronic hydraulic braking system with multiple working modes. The electronic hydraulic braking system mainly comprises a braking pedal, a braking pedal displacement sensor, an active control booster, 2 / 2 normally-closed solenoid valves, an active pedal sense simulator, a hydraulic control unit, an electronic control unit, a braking main cylinder and braking wheel cylinders. The electronic hydraulic braking system adopts a double-power source braking system form, so that the fault-tolerant capability of the system can be improved, the relatively steady pedal sense can be guaranteed during the switching of various braking conditions, and furthermore, the relatively high pressurizing response speed of the system can be guaranteed.

Disclosed is a vehicle brake device that can achieve high regenerative efficiency and high fuel efficiency as well as apply basic hydraulic braking force as quickly as possible when a brake pedal has been suddenly applied, by proactively utilizing regenerative braking in a low tread force range from when the brake pedal is first pressed until said pedal reaches a predetermined state. The vehicle brake device provides a first port (23h), which connects to a reservoir tank (24) and is provided in a first hydraulic pressure chamber (23d) of a master cylinder (23), between a first position that corresponds to the status at which a blocking end of a first piston (23b) that blocks said port (23h) starts be depressed and a second position that corresponds to a predetermined status that is removed a predetermined distance (S) in the pressure-increase direction of the first piston (23b). An orifice is provided in the first port (23h) that is configured to control the flow of brake fluid from the master cylinder to the reservoir tank when the brake pedal is depressed suddenly and, conversely, to not control said flow when said brake pedal is not depressed suddenly.

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.

The invention provides an electric power brake system with arbitrarily decoupled degrees of freedom for electric vehicles to solve the problems that the existing electric power brake system has a complex assistance mechanism, a single decoupled situation, and a poor sense of maintaining the pedal. The brake pedal assembly is connected with the brake master cylinder through the electric power assembly. A decoupled device assembly is arranged on the pipeline between the brake master cylinder and the HCU, and the power motor assembly is connected with the electric assist assembly. When decoupled,the front and rear axle brake friction can be properly allocated through the control of the solenoid valve, thus achieving decoupling of any degree of freedom and ensuring that the car can maintain agood braking posture even in the case of regenerative braking; under any decoupled conditions, the control of the power motor can ensure that the brake pedal feel remains the same, the driver's senseof road cannot be affected when braking, no additional failure backup mechanism is required, and the vehicle can be slowed down or stopped through human power when the system fails to improve drivingsafety.

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 discloses a wire-control hydraulic braking system with an integrated vice master cylinder. The problems that the integration level is low, the braking pressure is relatively slowly set up by a motor, brake pressure variation is large, and pressure setting up accuracy is low are solved. The wire-control hydraulic braking system comprises a braking starting unit, a braking master cylinder, a braking vice master cylinder unit and an electromagnetic valve unit; the braking vice master cylinder unit comprises a motor and the braking vice master cylinder; the electromagnetic valve unit comprises a first two-position three-way electromagnetic valve, a second two-position three-way electromagnetic valve, a fifth constantly-open electromagnetic valve, a second constantly-close electromagnetic valve and a third constantly-close electromagnetic valve; the braking starting unit is connected with a first piston of a master cylinder body of the braking master cylinder through an input push rod of the braking starting unit; the braking master cylinder is in pipeline connection with the electromagnetic valve unit through the fifth constantly-open electromagnetic valve; the braking vice master cylinder is in pipeline connection with the electromagnetic valve unit through the first two-position three-way electromagnetic valve, the second two-position three-way electromagnetic valve, the second constantly-close electromagnetic valve and the third constantly-close electromagnetic valve; and the motor and the braking vice master cylinder are connected with a first vice master cylinder piston through an output shaft in the motor.

The invention relates to a pedal feeling simulator with variable pedal feeling, comprising a simulation cylinder, a first piston, a second piston, a third piston, a fourth piston, a fifth piston, a first spring, a second spring and a third spring , pedal cylinder, first solenoid valve, second solenoid valve, third solenoid valve, electric control unit ECU and pedal displacement sensor; the pedal feeling simulator with variable pedal feeling of the present invention includes three kinds of pedal feeling modes, and the structure It is simple and can provide good pedal feeling. The spring is mainly used as the component to generate the pedal feedback force. Different spring combinations are used to simulate the pedal feeling in different braking stages, and the on-off of the hydraulic circuit can be controlled by the opening and closing of the solenoid valve. Different combinations of springs in the working state achieve different pedal sensations, and drivers can choose different pedal sensation modes according to their own driving habits to achieve a better driving experience.

Clutch pedal devices are known which comprise a rotatably mounted clutch pedal and means for generating a specified pedal force curve over the pedal path, said means comprising a pedal arm which is non-rotatably connected to the clutch pedal and which can be moved against a spring force of a helical spring. Disadvantageously, only a linearly increasing pedal force curve over the pedal path can be achieved using said design. Thus, a pedal sensation is produced which strongly deviates from the pedal sensation produced when using a conventional clutch pedal which hydraulically actuates the clutch. In the clutch pedal device according to the invention, the pedal force curve over the pedal path also has a section with a negative slope after a section with a positive slope. In this manner, a pedal sensation is produced which strongly resembles the pedal sensation when actuating a conventional clutch pedal which hydraulically actuates the clutch. According to the invention, the pedal arm (3) acts on a rotatably mounted lever arm (5), to which a counter force is applied, and is moved on a contour (6) of the lever arm (5) when the clutch pedal (1) is actuated.

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.

The invention relates to a braking energy recycling device of an electric automobile and a method for controlling the braking energy recycling device. The braking energy recycling device comprises a control system and a hydraulic braking system, wherein the control system comprises a finished automobile controller, an anti-skid braking system / traction control system / electronic stability program (ABS / TCS / ESP) controller, a motor controller, a driving motor and a feedback controller connected with a hydraulic valve block; the hydraulic braking system comprises a braking master cylinder, a braking pedal, a pressure adjuster, a front wheel braking cylinder, a rear wheel braking cylinder and the hydraulic valve block; the hydraulic block comprises two braking oil circuits, a pedal simulator shared by the two braking oil circuits and a master cylinder pressure sensor and a wheel cylinder pressure sensor which are arranged on one of the two braking oil circuits; and the feedback controller comprises a communication module, a pressure acquisition module, a control module and a driving module. The braking energy recycling device is simple in structure, small in size and low in cost; by the braking energy recycling device, a driver can have the same pedalling feeling as that of the conventional automobile; and the braking energy recycling device can be widely applied to various pure electric automobiles and hybrid electric automobiles.