Method for controlling a pressure gradient of a power brake system
A method for controlling a maximum permissible pressure gradient of a power brake system of a motor vehicle. The method includes continuously calculating a maximum permissible pressure gradient, starting from a current motor speed gradient and motor speed of an external-force brake pressure generator, taking into account a predefined maximum permissible motor speed and a predefined maximum permissible motor speed gradient. In a next step, the maximum permissible pressure gradient is continuously transmitted to brake pressure demand units, so that, in the case of a braking event, the pressure gradient requested by the brake pressure demand units or resulting from a requested pressure is generally less than or equal to the maximum permissible pressure gradient.
1 . A method for controlling a maximum permissible pressure gradient of a power brake system of a motor vehicle, the method comprising the following steps:
continuously calculating a maximum permissible pressure gradient, starting from a current motor speed gradient and motor speed of an external-force brake pressure generator, taking into account a predefined maximum permissible motor speed and a predetermined maximum permissible motor speed gradient; and
continuously transmitting the maximum permissible pressure gradient to brake pressure demand units so that, in the case of a braking event, a pressure gradient requested by the brake pressure demand units or resulting from a requested pressure is less than or equal to the maximum permissible pressure gradient.
2 . The method according to claim 1 , wherein, in predefined braking situations of the brake pressure demand units, a pressure gradient or a pressure gradient resulting from the requested pressure, is required which lies above the maximum pressure gradient.
3 . The method according to claim 1 , wherein a brake fluid volume provided by the external-force brake pressure generator is used to brake a single axle.
4 . The method according to claim 1 , wherein, a brake pressure at a rear axle and a brake pressure at a front axle are controlled independently of one another.
5 . The method according to claim 1 , wherein an additional braking torque is applied by recuperation to reduce the pressure gradient.
6 . The method according to claim 1 , wherein one axle of the motor vehicle is braked entirely by recuperation.
7 . A power brake system, comprising:
a comfort control unit configured to calculate a maximum permissible pressure gradient;
an external-force brake pressure generator, via which a pressure for vehicle brakes can be generated for braking the vehicle; and
brake pressure demand units via which, for braking the motor vehicle, a pressure gradient or pressure can be transmitted to the external-force brake pressure generator;
wherein the power brake system is configured to:
continuously calculate a maximum permissible pressure gradient, starting from a current motor speed gradient and motor speed of the external-force brake pressure generator, taking into account a predefined maximum permissible motor speed and a predetermined maximum permissible motor speed gradient; and
continuously transmit the maximum permissible pressure gradient to the brake pressure demand units so that, in the case of a braking event, a pressure gradient requested by the brake pressure demand units or resulting from a requested pressure is less than or equal to the maximum permissible pressure gradient.