Roll stability control system
First Claim
1. A vehicle braking system for providing roll stability control, comprising:
- a brake chamber associated with a vehicle wheel to be braked;
an air-pressure controlled relay valve for providing air pressure to the brake chamber;
a solenoid controlled pilot valve for controlling flow of control air to the relay valve;
a solenoid-controlled supply pressure valve operative to direct either supply pressure or driver control pressure to the pilot valve as control air for the relay valve;
an ECU operative to control the solenoids on the supply pressure valve and the pilot valve; and
sensors for sensing vehicle conditions that can be used in a determination of whether to initiate roll stability control.
1 Assignment
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Accused Products
Abstract
A roll stability control system for a pneumatically operated vehicle brake system is implemented using simpler ABS hardware rather than more complex EBS hardware. For each brake chamber or channel, two 3/2 solenoid controlled valves are used. An ECU is operative to control the solenoids. The ECU is preferably operative to provide a selected delivery pressure to the brake chamber without measurement of delivery pressure to the brake chamber. Supply air is provided at a known pressure to a first solenoid controlled valve that is associated with the brake chamber; the amount of time of energization and de-energization of the first valve that is needed to provide an output therefrom of a given pressure, is calculated; and the first valve is energized and de-energized for the calculated times, thereby to cause a low-pressure test pulse to be provided to the brake chamber.
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Citations
35 Claims
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1. A vehicle braking system for providing roll stability control, comprising:
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a brake chamber associated with a vehicle wheel to be braked;
an air-pressure controlled relay valve for providing air pressure to the brake chamber;
a solenoid controlled pilot valve for controlling flow of control air to the relay valve;
a solenoid-controlled supply pressure valve operative to direct either supply pressure or driver control pressure to the pilot valve as control air for the relay valve;
an ECU operative to control the solenoids on the supply pressure valve and the pilot valve; and
sensors for sensing vehicle conditions that can be used in a determination of whether to initiate roll stability control. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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4. A system as set forth in claim 4 wherein said ECU is operative to cause the low pressure test pulse to be provided without the use of a measurement of delivery pressure at the wheel to be braked.
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18. A vehicle braking system for providing roll stability control, comprising:
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a brake chamber associated with a vehicle wheel to be braked;
an air-pressure controlled relay valve for providing air pressure to the brake chamber;
a solenoid controlled pilot valve for controlling flow of control air to the relay valve;
a solenoid-controlled supply pressure valve operative to direct either supply pressure or driver control pressure to the pilot valve as control air for the relay valve; and
an ECU operative to control the solenoids on the supply pressure valve and the pilot valve thereby to provide a selected delivery pressure to the brake chamber without measurement of delivery pressure to the brake chamber. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of controlling vehicle roll stability by applying air pressure to a brake chamber associated with a vehicle wheel, comprising the steps of:
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providing supply air at a known pressure to a first solenoid controlled valve that is associated with the brake chamber;
calculating the amount of time of energization and de-energization of the first valve that is needed to provide an output therefrom of a given pressure; and
energizing and de-energizing the first valve for the calculated times, thereby to cause a low-pressure test pulse to be provided to the brake chamber. - View Dependent Claims (32, 33, 34, 35)
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Specification