Hydraulic brake system with slip control
First Claim
1. A hydraulic brake system with slip control, including a pedal-operable master cylinder, to which a front-wheel brake and a rear-wheel brake of an automotive vehicle are connected at least through a main pressure line, including a hydraulic auxiliary-pressure pump which is connected to an auxiliary-pressure line and takes in pressure medium from a reservoir and supplies it to the wheel brakes, and including wheel speed sensors and a controlling and regulating electronic unit to determine the wheel rotational behavior and to generate electric braking pressure control signals, said brake system further including pressure modulation valves, including at least one inlet valve and at least two outlet valves, connected to the wheel brakes to control the braking pressure, characterized in that a pressure-medium displacing element is connected to the main pressure line which leads to the rear-wheel brake, the pressure of the auxiliary-pressure pump being adapted to be applied to a first end surface of the pressure-medium displacing element, wherein said first end surface is in selective fluid communication with said front-wheel brake, and in that the pressure prevailing in the rear-wheel brake is adapted to be applied to a second end surface which is arranged opposite to the first end surface,, wherein said pressure-medium displacing element undergoes a stroke to displace a pressure from said front wheel-brake toward said rear-wheel brake.
1 Assignment
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Accused Products
Abstract
A pressure-medium displacing element is connected to the main pressure line which leads to the rear-wheel brake, and a first end surface of the pressure-medium displacing element is acted upon by the pressure of the auxiliary-pressure pump, while the pressure prevailing in the rear-wheel brake is applied to the second end surface which is opposed to the first end surface.
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Citations
36 Claims
- 1. A hydraulic brake system with slip control, including a pedal-operable master cylinder, to which a front-wheel brake and a rear-wheel brake of an automotive vehicle are connected at least through a main pressure line, including a hydraulic auxiliary-pressure pump which is connected to an auxiliary-pressure line and takes in pressure medium from a reservoir and supplies it to the wheel brakes, and including wheel speed sensors and a controlling and regulating electronic unit to determine the wheel rotational behavior and to generate electric braking pressure control signals, said brake system further including pressure modulation valves, including at least one inlet valve and at least two outlet valves, connected to the wheel brakes to control the braking pressure, characterized in that a pressure-medium displacing element is connected to the main pressure line which leads to the rear-wheel brake, the pressure of the auxiliary-pressure pump being adapted to be applied to a first end surface of the pressure-medium displacing element, wherein said first end surface is in selective fluid communication with said front-wheel brake, and in that the pressure prevailing in the rear-wheel brake is adapted to be applied to a second end surface which is arranged opposite to the first end surface,, wherein said pressure-medium displacing element undergoes a stroke to displace a pressure from said front wheel-brake toward said rear-wheel brake.
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20. A hydraulic brake system with slip control comprising:
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a master cylinder; a main pressure line having a front-wheel branch and a rear-wheel branch; an auxiliary-pressure line; a front-wheel brake associated with a front wheel and connected to said master cylinder through said front-wheel branch of said main pressure line; a rear-wheel brake associated with a rear wheel and connected to said master cylinder through said rear-wheel branch of said main pressure line; a pressure-medium reservoir; an auxiliary-pressure pump connected to said auxiliary-pressure line for supplying pressure medium from said pressure-medium reservoir to said front-wheel brake and said rear-wheel brake; a front-wheel sensor for developing a front-wheel signal representative of the wheel rotation behavior of the front wheel; a rear-wheel sensor for developing a rear-wheel signal representative of the wheel rotation behavior of the rear wheel; a controlling and regulating electronic unit responsive to said front-wheel signal and said rear-wheel signal for determining the wheel rotation behavior of the front wheel and the rear wheel and for generating braking pressure control signals; pressure modulation valves, including at least one inlet valve and at least two outlet valves, in said front-wheel branch of said main pressure line and said rear-wheel branch of said main pressure line responsive to said braking pressure control signals for regulating pressure medium flow to said front-wheel brake and said rear-wheel brake to control braking pressure in said front-wheel brake and said rear-wheel brake; and a pressure-medium displacing element, having a first end and a second end having a nominal diameter, which undergoes a stroke to displace a pressure from said front wheel-brake toward said rear-wheel brake and is connected in said rear-wheel branch of said main pressure line and responsive to; (a) pressure of the pressure medium supplied by said auxiliary-pressure pump to a first end surface of said pressure-medium displacing element, wherein said first end surface is in selective fluid communication with said front-wheel brake, and (b) pressure of the pressure medium prevailing in said rear-wheel brake applied to a second end surface of said pressure-medium displacing element opposite to said first end surface; wherein the pressure displaced by the stroke and the nominal diameter of said second end surface corresponds to the wheel braking pressure which is necessary for slip-free deceleration of said rear-wheel brake. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification