摘要:
A method and system is provided for controlling an electrohydraulic braking system for a motor vehicle having an antilock braking control function and an electrically controllable pressure generating device having a cylinder-piston arrangement having a hydraulic pressure chamber and a piston displaceable by an electromechanical actuator so that a predetermined pressure can be set in the chamber, and having a number of hydraulically wheel brakes connected to the hydraulic pressure chamber by an electrically actuatable inlet valve and to a pressure medium reservoir via an electrically actuatable outlet valve. The cylinder-piston arrangement is actuated in case of antilock controlling at all wheel brakes for setting an individual wheel target pressure at each wheel brake, such that the pressure in the hydraulic pressure chamber is set to the greatest wheel target pressure.
摘要:
A method for automatically decelerating a vehicle having a first side with a first front wheel brake and a first rear wheel brake and second side with a second front wheel brake and a second rear wheel brake, and in which the vehicle further has a braking system with a pump operable to deliver a flow of pressurized hydraulic fluid to the first and second front wheel brakes and to the first and second rear wheel brakes, includes receiving a signal associated with an emergency braking event. The method further includes increasing the hydraulic pressure at the first and second front wheel brakes at a greater rate than at the first and second rear wheel brakes. The method also includes directing hydraulic fluid from the first front wheel brake to the second rear wheel brake upon achieving a targeted level of deceleration or wheel slip.
摘要:
A brake fluid pressure control device for vehicles is provided capable of adjusting with a simple control a brake fluid pressure applied to a wheel brake. The control device includes for each system of an X-pipe arrangement: a cut valve as a linear solenoid valve provided to a first fluid pressure path; a pump capable of pressurizing brake fluid on a side toward the wheel brakes than the cut valve on the first fluid pressure path; and a control valve provided on the second fluid pressure path. The control device further includes: a target fluid pressure setting portion for setting a target fluid pressure for each of the wheel brake; and a valve actuating portion for drive-controlling the cut valve and the control valve, based on the target fluid pressure. The valve actuating portion performs for each of the systems the operations of drive-controlling the cut valve by using a higher one of the target fluid pressures of the wheel brakes as a target fluid pressure of the first fluid pressure path, to control the wheel brake having the higher target fluid pressure by driving only the cut valve, and of controlling a wheel brake having a lower target fluid pressure by driving the control valve corresponding to the wheel brake having the lower target fluid pressure.
摘要:
A wheel adjusting device can adjust separately the wheel angles of left and right wheels. A judgment portion which determines whether vehicle braking is to be permitted or not based on the driving state of the vehicle. A control portion controls the wheel adjusting device. More specifically, under conditions where the vehicle braking is permitted by the judgment portion, the control portion defines the wheel angles of the left and right wheels to be in opposite phase and adjusts the wheel angles in accordance with the braking force to be applied to the left and right wheels.
摘要:
A device and method are provided for determining a longitudinal force (Fx) exerted on a wheel of a motor vehicle by a ground surface supporting the wheel, the vehicle including connections means which connect the wheel to a body of the vehicle. An actual force (FAX) is measured at the level of at least one measurement point in the connection means. A force (FDx, Fx) is calculated which results from a transmission via the connection means from the at least one measurement point to the wheel, of a body-associated force (FADX, FAX), which depends at least on the actual force. The longitudinal force (Fx) exerted on the wheel by the ground surface is calculated as a function at least of the force (FDx; Fx) resulting from the transmission of the body-associated force.
摘要:
An anti-skid control system for an automotive vehicle, comprises a plurality of actuators each associated with one of front-left, front-right, rear-left and rear-right road wheels, for adjusting braking forces applied to the road wheels, sensors for detecting wheel speeds of the road wheels to generate wheel-speed indicative signals, and a controller for controlling the actuators in response to the wheel-speed indicative signals. The controller controls a hydraulic actuator associated with a controlled outer rear road wheel through a so-called select-LOW process between a wheel-speed indicative signal value of the controlled rear outer road wheel and a wheel-speed indicative signal value of a diagonal front wheel located on the vehicle diagonally to the controlled outer rear wheel only when the controller determines that the vehicle is in a cornering state with a high lateral acceleration during a braking-force control for the controlled outer rear wheel.
摘要:
Anti-lock brake system including a controller for controlling at least one solenoid-operated valve device for controlling braking pressures in a rear right and a rear left brake cylinder such that if two different control modes which would be selected for the rear brake cylinders independently of each other include pressure decrease mode, this pressure decrease mode is determined as effective control mode for one of the rear brake cylinders, while one of control modes which is not selected for the other rear brake cylinder and which causes lower braking pressure in the other rear brake cylinder than when the normally selected mode is determined as the effective control mode is determined as the effective control mode for that other rear brake cylinder, and wherein the normally selected different control modes are determined as the effective control modes for the rear brake cylinders if the normally selected control modes consist of pressure hold mode selected for one of the rear brake cylinders and pressure increase mode selected for the other rear brake cylinder.
摘要:
An antilock brake control system for a vehicle is capable of switching between an individual control mode and a collective control mode. The individual control mode regulates the braking forces of left and right wheel brakes in accordance with locking tendencies of the left and right wheels during braking. The collective control mode collectively regulates the braking forces of the left and right wheel brakes in accordance with one of the detected locking tendencies of the wheels, the direction of a vehicle's yaw rate and the steering direction. When these directions coincide with each other, the individual control mode is selected, but when these directions do not coincide with each other, the collective control mode is selected. Thus, it is possible to easily determine a state where the friction coefficients of the road sections, with which the left and right wheels are contacted, are different. Thus, stability is insured in the collective control mode. At other times, the individual control mode can be selected to provide a sufficient braking force.
摘要:
A vehicle braking system is provided for delaying the flow of brake fluid to the rear brakes to reduce the risk of locking the rear brakes. The braking system preferably has a master cylinder, a pair of disk brakes respectively positioned on a pair of rear wheels of a vehicle, and inlet and outlet brake lines each respectively connected to the master cylinder and the pair of rear disk brakes. A fluid circulator valve preferably is positioned between and in fluid communication with the master cylinder and the pair of rear disk brakes and is connected to the inlet and outlet brake lines. A rear brake delay valve preferably is positioned between and in fluid communication with the circulator valve and the pair of rear disk brakes and is connected to the inlet brake line. The rear brake delay valve preferably has a housing including a first opening connected to a first portion of the inlet brake line and a second opening connected to a second portion of the inlet brake line, and a check valve positioned within the housing in fluid communication with the first and second openings. The check valve has a perforated member having a predetermined sized orifice extending therethrough so that the check valve delays fluid flowing from the first opening through the second portion of the inlet brake lines and to the pair of rear disk brakes.
摘要:
A vehicle anti-lock braking system having X-crossed two pressure application sub-systems connected to respective independent chambers of a master cylinder, each sub-system including a normally-open first shut-off valve in a front brake cylinder passage between the master cylinder and a front wheel brake cylinder, a series connection of a normally-open second shut-off valve and a proportioning valve disposed in a portion of a rear brake cylinder passage connected to the front brake cylinder passage and a rear wheel brake cylinder, a normally-closed third shut-off valve in a reservoir passage connected to the rear brake cylinder passage and a reservoir, a pump in a pump passage which is connected at one end to the reservoir and the other end to a portion of the rear brake cylinder passage between the proportioning valve and the rear wheel brake cylinder, and a controller for controlling the three shut-off valves.