Vehicle braking system distribution of front and rear braking forces is controlled according to two different distribution patterns depending upon vehicle load
First Claim
1. A braking system for braking a motor vehicle by operation of a front and a rear brake for a front and a rear wheel of the vehicle, respectively, said braking system comprising:
- a distribution control device to control a distribution of a front wheel braking force and a rear wheel braking force which are produced by said front and rear brakes, respectively, and which are applied to said front and rear wheels, said distribution control device controlling said distribution according to a selected one of a first distribution pattern and a second distribution pattern, each of said first and second distributin patterns being a relationship between said front and rear wheel braking forces such that said rear wheel braking force defined by said second distribution pattern is larger than that defined by said first distribution pattern at least when the front and rear wheel braking forces are smaller than respective predetermined values, and when at least said rear wheel braking force is being increased.
1 Assignment
0 Petitions
Accused Products
Abstract
A braking system for braking a motor vehicle by the front and rear brakes of the vehicle'"'"'s front and rear wheels, respectively, including a distribution control device for controlling a distribution of front and rear wheel braking force produced by the respective front and rear brakes, according to a selected one of a first and a second distribution pattern, each of which represents the front and rear wheel braking forces in relation to each other wherein the rear wheel braking force defined by the second distribution pattern is larger than that defined by the first distribution pattern at least when the front and rear wheel braking forces are smaller than respective predetermined values. The selection of the two distribution patterns may be dependent on vehicle load.
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Citations
19 Claims
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1. A braking system for braking a motor vehicle by operation of a front and a rear brake for a front and a rear wheel of the vehicle, respectively, said braking system comprising:
a distribution control device to control a distribution of a front wheel braking force and a rear wheel braking force which are produced by said front and rear brakes, respectively, and which are applied to said front and rear wheels, said distribution control device controlling said distribution according to a selected one of a first distribution pattern and a second distribution pattern, each of said first and second distributin patterns being a relationship between said front and rear wheel braking forces such that said rear wheel braking force defined by said second distribution pattern is larger than that defined by said first distribution pattern at least when the front and rear wheel braking forces are smaller than respective predetermined values, and when at least said rear wheel braking force is being increased. - View Dependent Claims (2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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6. A braking system according to claim wherein at least a part of said portion of said rear brake cylinder passage between the point of connection of said front and rear brake cylinder passages and the point of connection of said rear brake cylinder passage and said pump passage consists of a first and a second passage which are concentric with and mutually independent of each other and which have a circular and an annular cross sectional shape, respectively, said first check valve being disposed in one of said first and second passages while said second check valve being disposed in the other of said first and second passages.
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16. A braking system for braking a motor vehicle by operation of a front and rear brake for a front and a rear wheel of the vehicle, respectively, said braking system comprising:
a distribution control device to control a distribution of a front wheel braking force and a rear wheel braking force which are produced by said front and rear brakes, respectively, and which are applied to said front and rear wheels, said distribution control device controlling said distribution according to a selected one of a first distribution pattern and a second distribution pattern, each of said first and second distribution patterns being a relationship between said front and rear wheel braking forces such that said rear wheel braking force defined by said second distribution pattern is larger than that defined by said first distribution pattern at least when said rear wheel braking force is being increased. - View Dependent Claims (17, 18)
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19. A braking system of a diagonal or X-crossing type for braking a four-wheel motor vehicle by operation of a front and a rear brake for a front and a rear wheel of the vehicle, respectively, said braking system including two pressure application sub-systems which are connected to respective two mutually independent pressurizing chambers of a master cylinder, each of said two pressure application sub-systems comprising:
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(a) a front brake cylinder passage connecting a corresponding one of said two pressurizing chambers of said master cylinder and a front wheel brake cylinder of said front brake; (b) a rear brake cylinder passage connecting said front brake cylinder passage and a rear wheel brake cylinder of said rear brake; (c) a master cylinder cut valve in the form of a normally-open shut-off valve disposed in a portion of said front brake cylinder passage between said master cylinder and a point of connection of said front and rear brake cylinder passages, said master cylinder cut valve being closed when the braking system is in an anti-lock pressure control mode, and opened when the braking system is not in said anti-lock pressure control mode; (d) an intermediate valve in the form of a normally-open shut-off valve disposed in said rear brake cylinder passage; (e) a reservoir passage connected at one of opposite ends thereof to a portion of said rear brake cylinder passage between said intermediate valve and said rear wheel brake cylinder; (f) a reservoir connected to the other end of said reservoir passage; (g) a pressure reducing valve in the form of a normally-closed shut-off valve disposed in said reservoir passage; (h) a pump passage connected at one of opposite ends thereof to said reservoir and at the other end to a portion of said rear brake cylinder passage between said intermediate valve and a point of connection of said front and rear brake cylinder passages; (i) a pump disposed in said pump passage for delivering a working fluid from said reservoir to a portion of said each pressure application sub-system; (j) a controller operable in said anti-lock pressure control mode for controlling said master cylinder cut valve, said intermediate valve, said pressure reducing valve and said pump to effect an anti-lock pressure control operation for controlling pressures of said fluid in said front and rear wheel brake cylinders in an anti-lock manner; and (k) a check valve device disposed in a portion of said rear brake cylinder passage between the point of connection of said front and rear brake cylinder passages and a point of connection of said rear brake cylinder passage and said pump passage, said check valve device comprising a first check valve and a second check valve, said first check valve permitting a flow of the fluid therethrough in a first direction from said pump toward said front wheel brake cylinder after the pressure generated by the pump becomes higher than the pressure in said front wheel brake cylinder by more than a predetermined difference, and inhibiting a flow of the fluid therethrough in a second direction opposite to said first direction, said second check valve permitting a flow of the fluid therethrough in said second direction and inhibiting a flow of the fluid therethrough in said first direction.
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Specification