Method and apparatus for activating a pump of a braking system as a function of the pressure gradient
AssigneeRobert Bosch GmbH
InventorJuergen Hachtel
Life of this patent
Estimating the term…
Abstract
An activation signal of a pump of a braking system is created as a function of a pressure gradient, preferably from a pressure accumulator. In this context, the switched-on time of a pulse-width modulated signal within an activation clock cycle is varied, taking into consideration the accumulator pressure gradient, in order to activate the pump. This is done by addressing a switching arrangement by way of a control unit. Activation as a function of the pressure gradient can be accomplished alternatively to or in combination with activation as a function of the generator voltage of the pump motor.
Claims10
A method for activating an arrangement including a pump for delivering a pressure medium in a braking system, the method comprising the steps of:
- ascertaining a pressure gradient variable representing an actual value of a pressure gradient of the pressure medium;
- and
- predefining a first condition as a first dependency mode such that an activation signal is generated as a function of the ascertained pressure gradient variable wherein the activation signal is dependent on the first condition.
An apparatus for generating an activation signal for activating an arrangement including a pump for delivering a pressure medium in a braving system, the activation signal being dependent on a first condition, the apparatus comprising:
- a control unit;
- and
- a sensor arrangement associated with the control unit, the control unit performing the steps of:
- ascertaining a pressure gradient variable representing an actual value of a pressure gradient of the pressure medium,
- predefining the first condition as a first dependency mode such that the activation signal is generated as a function of the ascertained pressure gradient variable, and
- predefining a second condition as a second dependency mode such that the activation signal is generated as a function of a voltage variable associated with the arrangement for delivering the pressure medium, wherein the generation of the activation signal is one of:
- simultaneously dependent on the first condition and the second condition,
- alternatively dependent on the first condition and the second condition, and
- exclusively dependent on the first condition and the second.
Dependencies are inferred from the claim text.