Vehicle brake force generation device

Abstract

A vehicle brake force generation device (11) is provided with an electric motor (13) for applying drive force and regenerative brake force to the wheels (17) of an electric vehicle (V), a brake hydraulic pressure generation device (26) for generating the brake hydraulic pressure to be applied to the calipers (27) of the electric vehicle (V), a slip information computation unit (63) for computing the slip information of the wheels (17), a VSA device (18) for controlling the friction braking of at least the brake hydraulic pressure generation device (26) such that the slipping of the wheels (17) is inhibited, a first diagnosis unit (67) for diagnosing the VSA device (18), and a brake control unit (65) for controlling the cooperative braking which includes controlling the regenerative braking of the electric motor (13) and/or controlling the friction braking of the brake hydraulic pressure generation device (26). The brake control unit (65) continues to control the regenerative braking of the electric motor (13) when a behavior stabilization assistance device (18) goes into an abnormal state while the regenerative braking of the electric motor (13) is being controlled.

Description

technical field [0001] The present invention relates to a braking force generator for a vehicle that generates braking force for a vehicle. Background technique [0002] For example, in a hybrid vehicle, not only a conventional brake device that generates a braking force through a hydraulic circuit but also a By-Wire type brake device that generates a braking force through an electric circuit is used. In this drive-by-wire brake device, an operation amount of a brake pedal by a driver is converted into an electric signal, and supplied to an electric motor that drives a piston of a slave cylinder (hereinafter referred to as "electric servo brake device"). In this way, the motor compresses and drives the piston to generate brake hydraulic pressure in the electric servo brake device, and the wheel cylinder (wheel cylinder) is operated according to the brake hydraulic pressure thus generated to generate friction-based braking force. [0003] In such a drive-by-wire brake device...

AI Technical Summary

Problems solved by technology

[0015] However, in the braking force control technique disclosed in Patent Document 1, if the diagnostic result of the ABS device is abnormal, the regenerative braking control of the wheel drive motor is immediately prohibited, which may cause regenerative braking to the driver. Uncomfortable braking feeling caused by a sudden change in braking force caused by sudden stop of braking control, and the power obtained by regenerative braking will decrease

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