A trailer braking system comprises a vehicles having a continuously-variable hydrostatic transmission, and a trailer coupled for towing by the vehicle and having an associated braking system operable from the vehicle. The vehicle transmission includes a first pressure sensor arranged to measure a fluid pressure at a predetermined point within the transmission, and a rotation sensor arranged to determine a rotation direction of a predetermined component in a driveline of the vehicle. A control unit coupled to the first pressure sensor and rotation sensor determines when a PUSH condition exists based on a particular combination of pressure and rotational direction, and operates the trailer brakes in response. One or more back-up systems to confirm the existence of a PUSH condition may be provided.

An electropneumatic control module for an electronically controllable pneumatic brake system for a vehicle combination with a tractor vehicle and a trailer vehicle includes a pneumatic reservoir input, which is connectable to a compressed-air reservoir, a trailer control unit, which has a trailer control valve unit with one or more electropneumatic valves, a trailer brake pressure port and a trailer supply pressure port, an immobilizing brake unit, which has a spring-type actuator port for a spring-type actuator for a tractor vehicle and an immobilizing brake valve unit with one or more electropneumatic valves, and an electronic control unit for controlling the trailer control valve unit and the immobilizing brake valve unit. The trailer control unit has a first relay valve, which has a relay valve working input connected to the reservoir input, a relay valve output connected to the trailer brake pressure port, and a relay valve ventilation output.

A brake device of the present invention includes: a wheel brake unit for braking a wheel; an electric motor for driving the wheel brake unit; a speed reducer for decelerating rotation of the electric motor; a rotation-linear motion converter for converting a rotational output of the speed reducer into a linear motion; and a braking force transmission member for transmitting the linear motion produced by the rotation-linear motion converter to the wheel brake unit.

A brake device of the present invention includes: a wheel brake unit for braking a wheel; an electric motor for driving the wheel brake unit; a speed reducer for decelerating rotation of the electric motor; a rotation-linear motion converter for converting a rotational output of the speed reducer into a linear motion; and a braking force transmission member for transmitting the linear motion produced by the rotation-linear motion converter to the wheel brake unit.

Towed vehicles can be extremely heavy. Accordingly, it is too much of a burden to the braking system of a towing vehicle to not have brakes on the towed vehicle. Controlling the brakes of the towed vehicle must be accurately applied otherwise very dangerous conditions can be created. A method of controlling braking of a towed vehicle is, therefore, needed. The method comprises receiving speed signals based on speed of a towing vehicle, or a towed vehicle, or both said towing vehicle and said towed vehicle, receiving pressure signals based on pressure of a hydraulic brake system of the towing vehicle, and generating a brake output signal based on the speed signals and the pressure signals.

Provided is an electric braking device that transmits power generated by an electric motor MTR to a pressing member PSN and causes pressing force to be generated by the pressing member PSN with respect to a friction member MSB. Hysteresis characteristics in the relation between the power supply amount to the electric motor and the pressing force of the pressing member are detected each time a predetermined point in time arrives. Upon determination of a “holding state in which the pressing force is held constant”, a minimum value for a power supply amount that makes it possible to maintain the current pressing force is obtained on the basis of the most recently detected hysteresis characteristics and the power supply amount is set to a value determined on the basis of the obtained minimum value for the power supply amount.

A braking force control system includes: a brake device and at least one electronic control unit. The brake device is configured to generate a braking force commensurate with a brake operation amount of a driver. At least one electronic control unit is configured to execute vehicle speed control for controlling a speed of a vehicle to a target speed by controlling a driving force and a braking force. The electronic control unit is configured to cause the brake device to generate an actual braking force corresponding to a total value of an additional braking force and an operational braking force when brake operation is performed during execution of the vehicle speed control. The additional braking force corresponds to a controlled braking force required by the vehicle speed control. The operational braking force is required through the brake operation.

An anti-lock braking unit is provided which has a single actuating solenoid acting on a piston of an associated valve unit. The actuating solenoid moves the piston within a primary hydraulic chamber in fluid communication with a brake calliper. A movement of the piston closes a bypass passage formed within the valve unit, that connects a master cylinder to the brake calliper. By closing the bypass passage, the build-up of pressure acting on the calliper is stopped. Simultaneously, the movement of the piston opens an outflow passage within the valve unit, allowing a brake fluid to vent from the primary hydraulic chamber into an expansion chamber. The expansion chamber provides an increased volume for brake fluid contained between the valve unit and the brake calliper, thereby decreasing pressure of the brake fluid acting on the calliper.

A method for controlling a vehicle brake system for a heavy duty vehicle including a primary brake system and an auxiliary brake system. The method includes configuring a wheel slip magnitude limit, obtaining a requested auxiliary brake torque, engaging the primary brake system at a torque determined in dependence of the requested auxiliary brake torque, while monitoring a wheel slip value, determining an allowable auxiliary brake torque in dependence of the requested auxiliary brake torque and the wheel slip value, and engaging the auxiliary brake system at the allowable auxiliary brake torque.

Braking system for carrying out additional safe braking functions

Various embodiments of a braking system (500) for at least one bogie or railway vehicle comprising an emergency braking control unit (503) made according to a first safety integrity level and a service braking control unit (508) made according to a second safety integrity level lower than said first safety integrity level are described; the braking system (500) carrying out at least one additional braking function (550) at the same safety integrity level as the emergency braking control unit (503).