Patent ID: 9505390
Filing Date: 2016-11-29
CPC Classification: B60T

Claim Text:
1. A brake-assist device for a motor vehicle, comprising: a servomotor including: a control rod that activates the servomotor, wherein the control rod presses, at a first end, on the plunger piston, and receives, at a second end, a force exerted by a brake pedal, the force received being proportional to an origination force exerted by a driver of the vehicle; a component situated in the servomotor and in a contact space between the plunger piston and the moving part; a spring between the plunger piston and the moving part, the spring having a stiffness level and a compression; and an arrangement, situated in the servomotor, that, as a function of a driving mode, (i) varies the compression of the spring, (ii) displaces the plunger piston in the contact space, and (iii) displaces the component in the contact space, wherein the arrangement includes a control unit having a processing device configured to execute a program that determines, based on a selection of the driving mode, how the compression is varied, wherein a striking force that is returned to the driver at the brake pedal is based on the stiffness level and the compression of the spring, and wherein the stiffness level of the spring is selected such that when the driving mode is: