Rear pressure control and rear dynamic proportioning in a vehicle brake system
First Claim
1. A method for controlling a rear brake hydraulic circuit having a fluid storage element and a master cylinder supplying a volume of pressurized brake fluid to the rear brakes during the braking cycle in a pump-less anti-lock brake apparatus controlling the rotational speeds, during a braking cycle, of only the rear brakes of a vehicle having at least one front wheel, at least one rear wheel, and front and rear brakes acting on the front and rear wheels respectively, the method comprising:
- determining whether the vehicle is operating lightly loaded at a light vehicle weight (LVW) or heavily loaded at a gross vehicle weight (GVW) as a function of the rotational speed of at least one rear wheel and the rear brake pressure;
providing rear dynamic proportioning (RDP) when a predetermined deceleration rate is exceeded during the braking event with the vehicle operating at LVW;
monitoring rear brake pressure; and
determining a rear brake pressure rate (RBP Rate) from the rear brake pressure;
inhibiting RDP when the RBP rate is less than a predetermined value; and
inhibiting RDP when the vehicle is operating at GVW.
4 Assignments
0 Petitions
Accused Products
Abstract
An apparatus and method are provided for controlling a rear brake hydraulic circuit having a fluid storage element and a master cylinder supplying a volume of pressurized brake fluid to the rear brakes during the braking cycle in a pump-less anti-lock brake apparatus controlling the rotational speeds, during a braking cycle, of only the rear brakes of a vehicle having at least one front wheel, at least one rear wheel, and front and rear brakes acting on the front and rear wheels respectively, by determining whether the vehicle is operating lightly loaded at a light vehicle weight (LVW) or heavily loaded at a gross vehicle weight (GVW), providing rear dynamic proportioning (RDP) when a predetermined deceleration rate is exceeded during the braking event with the vehicle operating at LVW, and inhibiting RDP when the vehicle is operating at GVW. The apparatus and method also provide rear pressure control (RPC) during anti-lock braking.
16 Citations
12 Claims
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1. A method for controlling a rear brake hydraulic circuit having a fluid storage element and a master cylinder supplying a volume of pressurized brake fluid to the rear brakes during the braking cycle in a pump-less anti-lock brake apparatus controlling the rotational speeds, during a braking cycle, of only the rear brakes of a vehicle having at least one front wheel, at least one rear wheel, and front and rear brakes acting on the front and rear wheels respectively, the method comprising:
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determining whether the vehicle is operating lightly loaded at a light vehicle weight (LVW) or heavily loaded at a gross vehicle weight (GVW) as a function of the rotational speed of at least one rear wheel and the rear brake pressure; providing rear dynamic proportioning (RDP) when a predetermined deceleration rate is exceeded during the braking event with the vehicle operating at LVW; monitoring rear brake pressure; and determining a rear brake pressure rate (RBP Rate) from the rear brake pressure;
inhibiting RDP when the RBP rate is less than a predetermined value; andinhibiting RDP when the vehicle is operating at GVW. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification