Brake unit for automotive vehicles with electric drive
First Claim
1. A brake unit for automotive vehicles with electric drive, with a driven and a non-driven axle of vehicle wheels, with a first set of hydraulic friction brakes individually associated with said vehicle wheels of said driven axle, and with a second set of hydraulic friction brakes individually associated with said vehicle wheels of said non-driven axle, wherein said brake unit is provided in the shape of a multiple-circuit compound system consisting of said first set and said second set of said hydraulic friction brakes and an electroregenerative brake system, said electroregenerative brake system utilizing an electric driving motor of the automotive vehicle for braking and for energy recovery, and three brake circuits being provided, a first brake circuit which is comprised of a pedal-actuated brake pressure master unit and of said second set of hydraulic friction brakes, a second brake circuit which is constituted by the electroregenerative brake system which is directly or indirectly coupled to a brake pedal and which acts upon said driven wheels, and a third brake circuit which is comprised of said first set of hydraulic friction brakes and is coupled to the brake pedal, wherein an electronic controller which is fed with information on brake pressure caused by actuation of the brake pedal, on vehicle speed and on the charging condition of the vehicle batteries and evaluates said information for controlling said second brake circuit and said third brake circuit and for controlling the distribution of the brake power to said driven and said non-driven axles, characterized in that said first set of hydraulic friction brakes in a way isolated hydraulically from the brake pressure master unit, are connected to at least one of:
- (a) an electrohydraulic actuating mechanism which is driven by actuating signals of the controller, and(b) an auxiliary pressure source, for braking said vehicle wheels of said driven axle by applying pressure fluid to said first set of hydraulic friction brakes.
1 Assignment
0 Petitions
Accused Products
Abstract
A brake unit for automotive vehicles with electric drive is configured in the shape of a multiple-circuit compound system consisting of hydraulic friction brakes of brake circuits (I, I'"'"', I", III, III'"'"', III") and of an electroregenerative brake system (circuit II, II'"'"', II"). In a vehicle with a driven and a non-driven axle, three brake circuits exist, one brake circuit of which (I, I'"'"', I") is comprised of a pedal-actuated hydraulic brake pressure master unit (2) and of friction brakes (3, 4) acting upon the non-driven wheels. The second brake circuit (II, II'"'"', II") which represents an electroregenerative brake system is directly or indirectly coupled to the brake pedal and acts upon the driven wheels. The third brake circuit (III, III'"'"', III") which is comprised of friction brakes (10, 11) also acts upon the driven wheels. The actuation of the wheel brakes (10, 11) is connected to the second and third brake circuits. The distribution of the brake power to the front axle (VA) and to the rear axle (HA) is controlled with the aid of an electronic controller (7, 7'"'"',7").
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Citations
23 Claims
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1. A brake unit for automotive vehicles with electric drive, with a driven and a non-driven axle of vehicle wheels, with a first set of hydraulic friction brakes individually associated with said vehicle wheels of said driven axle, and with a second set of hydraulic friction brakes individually associated with said vehicle wheels of said non-driven axle, wherein said brake unit is provided in the shape of a multiple-circuit compound system consisting of said first set and said second set of said hydraulic friction brakes and an electroregenerative brake system, said electroregenerative brake system utilizing an electric driving motor of the automotive vehicle for braking and for energy recovery, and three brake circuits being provided, a first brake circuit which is comprised of a pedal-actuated brake pressure master unit and of said second set of hydraulic friction brakes, a second brake circuit which is constituted by the electroregenerative brake system which is directly or indirectly coupled to a brake pedal and which acts upon said driven wheels, and a third brake circuit which is comprised of said first set of hydraulic friction brakes and is coupled to the brake pedal, wherein an electronic controller which is fed with information on brake pressure caused by actuation of the brake pedal, on vehicle speed and on the charging condition of the vehicle batteries and evaluates said information for controlling said second brake circuit and said third brake circuit and for controlling the distribution of the brake power to said driven and said non-driven axles, characterized in that said first set of hydraulic friction brakes in a way isolated hydraulically from the brake pressure master unit, are connected to at least one of:
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(a) an electrohydraulic actuating mechanism which is driven by actuating signals of the controller, and (b) an auxiliary pressure source, for braking said vehicle wheels of said driven axle by applying pressure fluid to said first set of hydraulic friction brakes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A brake system for automotive vehicles with electric drive, an accelerator pedal, a vehicle battery having a charging condition and a driven axle and a non-driven axle of vehicle wheels, said brake system comprising:
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a brake pedal; a first set of hydraulic friction brakes individually associated with said vehicle wheels of said driven axle; a second set of hydraulic friction brakes individually associated with said vehicle wheels of said non-driven axle; a multiple-circuit compound brake system including; (a) a first brake circuit having a pedal-actuated brake pressure master unit for braking said vehicle wheels of said non-driven axle by applying pressure fluid to said second set of hydraulic friction brakes, (b) a second brake circuit which is an electroregenerative brake circuit, responsive to movement of said brake pedal, having an electric driving motor, for braking said vehicle wheels of said driven axle and for recovering energy from said vehicle wheels of said driven axle, (c) a third brake circuit, responsive to movement of said brake pedal and hydraulically isolated from said pedal-actuated brake pressure master unit, including at least one of; (i) an electrohydraulic actuating mechanism, and (ii) an auxiliary pressure source, for braking said vehicle wheels of said driven axle by applying pressure fluid to said first set of hydraulic friction brakes; means for developing vehicle speed signals representative of the vehicle speed; means for developing charging condition signals representative of the charging condition of the vehicle battery; means for developing pressure signals representative of the pressure in said pedal-actuated brake pressure master unit; and an electronic controller, responsive to; (a) said vehicle speed signals, (b) said charging condition signals, (c) said pressure signals, for generating control signals for controlling braking operation of said electroregenerative brake circuit and said third brake circuit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification