Brake control system for a motor vehicle
First Claim
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1. A brake control apparatus for a motor vehicle comprising:
- a master cylinder connected via a first hydraulic circuit to a plurality of wheel cylinders, and configured to generate a master cylinder pressure by a driver'"'"'s braking action;
a plurality of pressure control valves disposed in the first hydraulic circuit for regulating a wheel cylinder pressure of each of the wheel cylinders;
a pump having a pump inlet connected via a second hydraulic circuit to the master cylinder and connected via a return circuit to each of the wheel cylinders, and a pump outlet connected via the first hydraulic circuit to each of the wheel cylinders, and configured to generate a hydraulic pressure independently of a driver'"'"'s braking action;
an outflow gate valve disposed in the first hydraulic circuit;
an inflow gate valve disposed in the second hydraulic circuit; and
a brake control unit configured to be electronically connected to the pressure control valves, the oufflow and inflow gate valves, and the pump, for regulating the wheel cylinder pressure of each of the wheel cylinders by controlling operations of the respective valves and the pump, whereinthe brake control unit is configured to execute a pre-charge and flow-back operating mode in which the pump is operated for a pre-charge time duration, before execution of brake control that the pump is operated as a pressure source, or during an initial stage of the brake control, in a specified state where the outflow gate valve, the inflow gate valve, and the pressure control valves are kept open concurrently.
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Abstract
A brake control system for a motor vehicle comprising a brake control unit which controls increasing and decreasing of a brake pressure of a wheel cylinder from a pressure source by driving plural solenoid valves without a brake operation by a driver. The system comprises a flow back control unit which controls the brake pressure of a wheel cylinder to drive the plural solenoid valves before control by the brake control unit and returns the brake fluid to the pressure source from the wheel cylinder.
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Citations
18 Claims
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1. A brake control apparatus for a motor vehicle comprising:
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a master cylinder connected via a first hydraulic circuit to a plurality of wheel cylinders, and configured to generate a master cylinder pressure by a driver'"'"'s braking action; a plurality of pressure control valves disposed in the first hydraulic circuit for regulating a wheel cylinder pressure of each of the wheel cylinders; a pump having a pump inlet connected via a second hydraulic circuit to the master cylinder and connected via a return circuit to each of the wheel cylinders, and a pump outlet connected via the first hydraulic circuit to each of the wheel cylinders, and configured to generate a hydraulic pressure independently of a driver'"'"'s braking action; an outflow gate valve disposed in the first hydraulic circuit; an inflow gate valve disposed in the second hydraulic circuit; and a brake control unit configured to be electronically connected to the pressure control valves, the oufflow and inflow gate valves, and the pump, for regulating the wheel cylinder pressure of each of the wheel cylinders by controlling operations of the respective valves and the pump, wherein the brake control unit is configured to execute a pre-charge and flow-back operating mode in which the pump is operated for a pre-charge time duration, before execution of brake control that the pump is operated as a pressure source, or during an initial stage of the brake control, in a specified state where the outflow gate valve, the inflow gate valve, and the pressure control valves are kept open concurrently. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A brake control apparatus for a motor vehicle comprising:
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first pressure source means connected via a first hydraulic circuit to a plurality of wheel cylinders, for outputting a hydraulic pressure produced by a drivers braking action to each of the wheel cylinders; pressure control valve means disposed in the first hydraulic circuit for regulating a wheel cylinder pressure of each of the wheel cylinders, said pressure control valve means comprising pressure-increase and pressure-decrease valves; second pressure source means having an inlet port connected via a second hydraulic circuit to the first pressure source means and connected via a return circuit to each of the wheel cylinders, and an outlet port connected via the first hydraulic circuit to each of the wheel cylinders, for generating a hydraulic pressure independently of a drivers braking action; outflow gate valve means disposed in the first hydraulic circuit for controlling fluid communication between the first pressure source means and the pressure control valve means; inflow gate valve means disposed in the second hydraulic circuit for controlling fluid communication between the first pressure source means and the second pressure source means; and brake control means configured to be electronically connected to the pressure control valve means, the outflow and inflow gate valve means, and the second pressure source means, for regulating the wheel cylinder pressure of each of the wheel cylinders by controlling operations of the respective valve means and the second pressure source means, wherein the brake control means is configured to execute a pre-charge and flow-back operating mode in which the second pressure source means is operated for a pre-charge time duration, before execution of brake control that the second pressure source means is operated as a pressure source, or during an initial stage of the brake control, in a specified state where the oufflow gate valve means, the inflow gate valve means, and the pressure-increase valves of the pressure control valve means are kept open concurrently.
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18. A method of brake control for a motor vehicle employing a master cylinder connected via a first hydraulic circuit to a plurality of wheel cylinders, a plurality of pressure control valves disposed in the first hydraulic circuit, a pump having a pump inlet connected via a second hydraulic circuit to the master cylinder and connected via a return circuit to each of the wheel cylinders and a pump outlet connected via the first hydraulic circuit to each of the wheel cylinders for generating a hydraulic pressure independently of a driver'"'"'s braking action, an outflow gate valve disposed in the first hydraulic circuit, an inflow gate valve disposed in the second hydraulic circuit, and a brake control unit provided to regulate the wheel cylinder pressure of each of the wheel cylinders by controlling operations of the respective valves and the pump, the method comprising:
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pre-charging brake fluid through a fluid flow path that permits brake fluid flow from the master cylinder to each of the wheel cylinders via the inflow gate valve, the second hydraulic circuit, the pump, and the pressure control valves, with the inflow gate valve kept open during a pre-charge and flow-back operating mode in which the pump is operated for a pre-charge time duration, before execution of brake control that the pump is operated as a pressure source, or during an initial stage of the brake control, in a specified state where the outflow gate valve, the inflow gate valve, and the pressure control valves are kept open concurrently; and flowing-back brake fluid through a fluid flow path that permits brake fluid flow from each of the wheel cylinders back to the master cylinder via the pressure control valves, the first hydraulic circuit, and the outflow gate valve, with the outflow gate valve kept open during the pre-charge and flow-back operating mode, simultaneously with the pre-charging action.
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Specification