Vehicle braking system with drive wheel slip control
First Claim
1. A braking system comprising an anti-lock vehicle braking system for a vehicle having a pair of drive wheels the wheels of said pair being disposed on opposite sides of the vehicle, comprising a wheel speed sensor for each wheel a controller responsive to wheel speed signals from said two wheel speed sensors for sensing skid conditions at said wheels and for generating skid control instructions, a wheel brake for each wheel responsive to hydraulic pressure, hereinafter referred to as hydraulic brake pressure, supplied thereto, a common supply line for supplying a common hydraulic brake pressure for both of said brakes a hydraulic pressure converter in accordance with a pneumatic brake demand signal comprising air under pressure, said pneumatic brake demand signal being fed to a common supply valve, said common supply valve being connected to said converter for supply of pneumatic pressure thereto in accordance with the pneumatic brake demand signal, a skid control means controlled by said skid control instructions for modulating the common hydraulic brake pressure, a brake apply valve to supply said pneumatic brake demand signal to the common supply valve in response to the controller detecting a wheel spin condition of one of said wheels and isolating means to isolate the brake associated with the other of said wheels from the common hydraulic brake pressure, wherein said converter provides the sole connection between the pneumatic brake demand signal and the hydraulic brake pressure, the skid control means being operable to modulate the common brake pressure by modulating the pneumatic pressure supplied to the converter, the common hydraulic brake pressure being responsive solely to the pneumatic pressure supplied to the converter, isolating means being provided connected between the converter and each wheel brake solely to isolate the respective wheel brake.
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Accused Products
Abstract
A braking system comprising an anti-lock vehicle braking system for a vehicle having a pair of drive wheels (13, 14), the wheels of said pair being disposed on opposite sides of the vehicle, comprising a wheel speed sensor (17, 18) for each wheel (13, 14), a controller (19) responsive to wheel speed signals from said two wheel speed sensors (17, 18) for sensing skid conditions at said wheels (13, 14) and for generating skid control instructions, a wheel brake (23, 24) for each wheel (13, 14), responsive to fluid pressure, hereinafter referred to as brake pressure, supplied thereto, a common supply line (37), for supplying a common brake pressure for both of said brakes from a fluid pressure supply valve means (38) in accordance with a brake demand signal and a skid control means (40) controlled by said skid control instructions for modulating the common brake pressure, having a brake apply valve (51) to supply fluid under pressure to the common supply valve (39), in response to the controller detecting a wheel spin condition of one of said wheels (13, 14), to provide a common brake pressure for both of said brakes and isolating means (42, 43) to isolate the brake (23, 24) associated with the other of said wheels (13, 14) from the brake pressure.
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Citations
15 Claims
- 1. A braking system comprising an anti-lock vehicle braking system for a vehicle having a pair of drive wheels the wheels of said pair being disposed on opposite sides of the vehicle, comprising a wheel speed sensor for each wheel a controller responsive to wheel speed signals from said two wheel speed sensors for sensing skid conditions at said wheels and for generating skid control instructions, a wheel brake for each wheel responsive to hydraulic pressure, hereinafter referred to as hydraulic brake pressure, supplied thereto, a common supply line for supplying a common hydraulic brake pressure for both of said brakes a hydraulic pressure converter in accordance with a pneumatic brake demand signal comprising air under pressure, said pneumatic brake demand signal being fed to a common supply valve, said common supply valve being connected to said converter for supply of pneumatic pressure thereto in accordance with the pneumatic brake demand signal, a skid control means controlled by said skid control instructions for modulating the common hydraulic brake pressure, a brake apply valve to supply said pneumatic brake demand signal to the common supply valve in response to the controller detecting a wheel spin condition of one of said wheels and isolating means to isolate the brake associated with the other of said wheels from the common hydraulic brake pressure, wherein said converter provides the sole connection between the pneumatic brake demand signal and the hydraulic brake pressure, the skid control means being operable to modulate the common brake pressure by modulating the pneumatic pressure supplied to the converter, the common hydraulic brake pressure being responsive solely to the pneumatic pressure supplied to the converter, isolating means being provided connected between the converter and each wheel brake solely to isolate the respective wheel brake.
Specification