IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0431629
(2006-05-11)
|
등록번호 |
US-7530648
(2009-07-01)
|
우선권정보 |
JP-2005-139990(2005-05-12) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
Buchanan Ingersoll & Rooney PC
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
3 |
초록
▼
The brake hydraulic pressure control apparatus employs, as a pressure-increasing valve, a normally-open linear solenoid valve that can linearly adjust an actual differential pressure (difference between master cylinder hydraulic pressure and a wheel cylinder hydraulic pressure). This apparatus repea
The brake hydraulic pressure control apparatus employs, as a pressure-increasing valve, a normally-open linear solenoid valve that can linearly adjust an actual differential pressure (difference between master cylinder hydraulic pressure and a wheel cylinder hydraulic pressure). This apparatus repeatedly executes, in principle, a control cycle in which a pressure-reducing control, holding control and linear pressure-increasing control make one set, while a "linear pressure-increasing control with holding period" is executed instead of the linear pressure-increasing control only in the first-time control cycle that is started in a state where a current-value-corresponding-to-actual-differential-pressure cannot correctly be obtained. The command current value Id (=I0) to the pressure-increasing valve at the point of starting the "linear pressure-increasing control with holding period" is set to a "current-value-corresponding-to-reduced-pressure" that is always smaller than the current-value-corresponding-to-actual-differential-pressure at the same point.
대표청구항
▼
What is claimed is: 1. A brake hydraulic pressure control apparatus that is applied to a control unit provided with: a pressure-increasing valve disposed in a first hydraulic circuit between a master cylinder generating a master cylinder hydraulic pressure and a wheel cylinder, and adjusting a diff
What is claimed is: 1. A brake hydraulic pressure control apparatus that is applied to a control unit provided with: a pressure-increasing valve disposed in a first hydraulic circuit between a master cylinder generating a master cylinder hydraulic pressure and a wheel cylinder, and adjusting a differential pressure between the master cylinder hydraulic pressure and a wheel cylinder hydraulic pressure in the wheel cylinder proportionally in accordance with a first energizing current value provided to the pressure-increasing valve; and a pressure-reducing valve disposed in a second hydraulic circuit between the wheel cylinder and a reservoir and being opened and closed in accordance with a second energizing current value provided to the pressure-reducing valve, comprising: anti-skid control means for continuously executing, plural times, an anti-skid control that is started in response to an establishment of a predetermined anti-skid control start condition, and in which anti-skid control, a pressure-reducing control for reducing the wheel cylinder hydraulic pressure is executed by controlling the first energizing current value and the second energizing current value and then a linear pressure-increasing control for increasing the wheel cylinder hydraulic pressure linearly continues to be executed by changing the first energizing current value with a basic pattern, in which pattern the first energizing current value linearly changes with a constant negative slope while the pressure-reducing valve is maintained in its closed state through controlling the second energizing current value until the next anti-skid control start condition is established, wherein the anti-skid control means is configured to set the first energizing current value to values, instead of the values corresponding to the basic pattern, for maintaining the pressure-increasing valve in its closed state over a predetermined period which is a part of a period from a starting point to an ending point of the linear pressure-increasing control in a predetermined-numberth-time anti-skid control, thereby executing a holding control for holding the wheel cylinder hydraulic pressure over the predetermined period. 2. A vehicle brake hydraulic pressure control apparatus according to claim 1, wherein the holding control is executed during the linear pressure-increasing control in the anti-skid control of a first time of the plural times. 3. A vehicle brake hydraulic pressure control apparatus according to claim 1, wherein the anti-skid control means is configured to set the first energizing current value at a point of starting the linear pressure-increasing control in the predetermined-numberth-time anti-skid control to a value corresponding to an increase amount of the differential pressure by a decrease in the wheel cylinder hydraulic pressure due to the pressure-reducing control in the predetermined-numberth-time anti-skid control. 4. A vehicle brake hydraulic pressure control apparatus according to claim 1, wherein the anti-skid control means is configured to set the first energizing current value during the execution of the pressure-reducing control in the predetermined-numberth-time anti-skid control to predetermined values (Ihold) for maintaining the pressure-increasing valve in its closed state and to set the first energizing current value during the execution of the holding control in the linear pressure-increasing control in the predetermined-numberth-time anti-skid control to values (ibase+Iadd) obtained by adding the fixed value to the values corresponding to the basic pattern are smaller than the predetermined values (Ihold) during the execution of the pressure-reducing control. 5. A vehicle brake hydraulic pressure control apparatus according to claim 1, wherein the anti-skid control means is configured to periodically execute the holding control during the linear pressure-increasing control in the predetermined-numberth-time anti-skid control. 6. A vehicle brake hydraulic pressure control apparatus according to claim 5, further comprising: holding control time changing means that obtains, during the linear pressure-increasing control in the predetermined-numberth-time anti-skid control, a value indicating a degree of an increase in a slip amount for a wheel to which the anti-skid control is to be performed, and changes, in accordance with the value indicating the degree of the increase in the slip amount for the wheel, a length of the predetermined period in which the holding control is executed. 7. A vehicle brake hydraulic pressure control apparatus according to claim 1, wherein the pressure increasing valve is a normally open linear solenoid valve having a relationship between a first energizing current value provided to the pressure increasing valve and a command value of a differential pressure between the master cylinder hydraulic pressure and a wheel cylinder hydraulic pressure in the wheel cylinder, the pressure increasing valve being closed to break a communication between the master cylinder and the wheel cylinder when the command value of the differential pressure is greater than an actual value of the differential pressure and being opened to establish communication between the master cylinder and the wheel cylinder when the command value of the differential pressure is smaller than the actual value of the differential pressure. 8. A brake hydraulic pressure control apparatus, comprising: anti-skid control means for continuously executing, plural times, an anti-skid control that is started in response to an establishment of a predetermined anti-skid control start condition, and in which anti-skid control, a pressure-reducing control is executed and then a linear pressure-increasing control is executed, the pressure-reducing control for reducing a wheel cylinder hydraulic pressure being executed by controlling a first valve in the form of a linear solenoid valve disposed in a first hydraulic circuit between a master cylinder and a wheel cylinder and a second valve disposed in a second hydraulic circuit between the wheel cylinder and a reservoir, the first valve adjusting a differential pressure between the master cylinder and the wheel cylinder proportionally, and the linear pressure-increasing control for increasing the wheel cylinder hydraulic pressure being continuously executed by controlling the first valve with an energizing current value that linearly changes with a constant negative slope so that the wheel cylinder hydraulic pressure is linearly increased with a constant slope while the second valve is maintained in its closed state until the next anti-skid control start condition is established, wherein the anti-skid control means controls the first valve to be maintained in its closed state over a predetermined period which is a part of a period from a starting point to an ending point of the linear pressure-increasing control in a predetermined-numberth-time anti-skid control, thereby executing a holding control for holding the wheel cylinder hydraulic pressure over the predetermined period. 9. A vehicle brake hydraulic pressure control apparatus according to claim 8, wherein the holding control is executed during the linear pressure-increasing control in the anti-skid control of a first time of the plural times. 10. A vehicle brake hydraulic pressure control apparatus according to claim 8, wherein first valve is a normally open linear solenoid valve having a relationship between a first energizing current value provided to the first valve and a command value of a differential pressure between the master cylinder hydraulic pressure and a wheel cylinder hydraulic pressure in the wheel cylinder, the first valve being closed to break a communication between the master cylinder and the wheel cylinder when the command value of the differential pressure is greater than an actual value of the differential pressure and being opened to establish communication between the master cylinder and the wheel cylinder when the command value of the differential pressure is smaller than the actual value of the differential pressure, the first valve adjusting the differential pressure proportionally in accordance with the first energizing current value provided to the first valve.
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