OIL LEAK DETECTING METHOD OF BRAKE SYSTEM AND DETECTING SYSTEM THEREOF

Abstract

Disclosed is an oil leak detecting method of a brake system and an oil leak detecting system thereof. The method includes: closing a first hydraulic circuit and monitoring an amount of a leak of brake oil in a second hydraulic circuit; closing the second hydraulic circuit and monitoring an amount of a leak of brake oil in the first hydraulic circuit; and determining where brake oil leaks from among the first hydraulic circuit and the second hydraulic circuit. The first hydraulic circuit controls a flow of hydraulic pressure transmitted to two wheel cylinders. The second hydraulic circuit controls a flow of hydraulic pressure transmitted to other two wheel cylinders.

Description

Claims

1. An oil leak detecting method comprising: closing a first hydraulic circuit and monitoring an amount of a leak of brake oil in a second hydraulic circuit;closing the second hydraulic circuit and monitoring an amount of a leak of brake oil in the first hydraulic circuit; anddetermining where brake oil leaks from among the first hydraulic circuit and the second hydraulic circuit,wherein the first hydraulic circuit controls a flow of hydraulic pressure transmitted to two wheel cylinders, andwherein the second hydraulic circuit controls a flow of hydraulic pressure transmitted to other two wheel cylinders.

2. The oil leak detecting method of claim 1, further comprising checking a level of brake oil, wherein the monitoring of the amount of leak of brake oil in the second hydraulic circuit comprises monitoring the amount of leak of brake oil in the second hydraulic circuit based on a level of the brake oil being lower than a preset value.

3. The oil leak detecting method of claim 1, further comprising monitoring the second hydraulic circuit to check whether or not the amount of leak of break oil in the second hydraulic circuit is greater than a preset value, wherein the monitoring of the amount of leak of brake oil in the first hydraulic circuit comprises monitoring the amount of leak of brake oil in the first hydraulic circuit based on an amount of leak of brake oil in the second hydraulic circuit being not greater than the preset value.

4. The oil leak detecting method of claim 3, wherein the determining where brake oil leaks from among the first hydraulic circuit and the second hydraulic circuit comprises determining that a leak has occurred in the second hydraulic circuit based on an amount of leak of brake oil in the second hydraulic circuit being greater than the preset value.

5. The oil leak detecting method of claim 3, further comprising: monitoring the first hydraulic circuit to check whether the amount of leak of brake oil in the first hydraulic circuit is greater than a preset value.

6. The oil leak detecting method of claim 5, wherein the determining where brake oil leaks from among the first hydraulic circuit and the second hydraulic circuit comprises determining that a leak has occurred in the first hydraulic circuit based on an amount of leak of brake oil in the first hydraulic circuit being greater than the preset value.

7. The oil leak detecting method of claim 5, further comprising: comparing a leak flow rate of brake oil from the first hydraulic circuit with a leak flow rate of brake oil from the second hydraulic circuit.

8. The oil leak detecting method of claim 7, wherein the determining where brake oil leaks from among the first hydraulic circuit and the second hydraulic circuit comprises determining that leak has occurred in the first hydraulic circuit based on a leak flow rate of brake oil from the first hydraulic circuit being greater than a value obtained by adding a reference value to the leak flow rate of brake oil from the second hydraulic circuit.

9. The oil leak detecting method of claim 5, further comprising: comparing a leak flow rate of brake oil from the first hydraulic circuit with a leak flow rate of brake oil from the second hydraulic circuit.

10. The oil leak detecting method of claim 9, wherein the determining where brake oil leaks from among the first hydraulic circuit and the second hydraulic circuit comprises determining that a leak has occurred in the second hydraulic circuit based on a leak flow rate of brake oil from the second hydraulic circuit being greater than a value obtained by adding a reference value to the leak flow rate of brake oil flowing out of the first hydraulic circuit.

11. The oil leak detecting method according to claim 9, wherein the determining where brake oil leaks from among the first hydraulic circuit and the second hydraulic circuit comprises determining that no leak has occurred in the first hydraulic circuit and the second hydraulic circuit based on a leak flow rate of brake oil from the second fluid circuit being not greater than the value obtained by adding the reference value to the leak flow rate of the braking oil from the first fluid circuit.

12. A leak detecting system comprising: a first hydraulic circuit configured to control a flow of hydraulic pressure transmitted to two wheel cylinders;a second hydraulic circuit configured to control a flow of hydraulic pressure transmitted to other two wheel cylinders;first and second inlet valves for opening and closing the first hydraulic circuit;third and fourth inlet valves for opening and closing the second hydraulic circuit; anda controller configured to control the first, second, third and fourth inlet valves,wherein the controller is configured to: close one of the first hydraulic circuit and the second hydraulic circuit, andmonitor an amount of leak of break oil from the other one which is not closed so as to determine a circuit in which brake oil leaks.

13. The oil leak detecting system of claim 12, further comprising: a first leak detector configured to detect an amount of leak of brake oil in the first hydraulic circuit; anda second leak detector configured to detect an amount of leak of brake oil in the second hydraulic circuit.

14. The oil leak detecting system of claim 12, wherein the controller is configured to: close the first hydraulic circuit,monitor the second hydraulic circuit, anddetermine that a leak has occurred in the second hydraulic circuit based on an amount of leak of break oil from the second hydraulic pressure circuit being greater than a preset value.

15. The oil leak detecting system of claim 12, wherein the controller is configured to: close the second hydraulic circuit,monitor the first hydraulic circuit, anddetermine that brake oil leaks in the first hydraulic circuit based on an amount of leak of break oil from the first hydraulic pressure circuit being greater than a preset value.

16. The oil leak detecting system of claim 12, wherein the control unit is configured to determine that hydraulic pressure has occurred in the first hydraulic circuit based on a leak flow rate of brake oil from the second hydraulic circuit being greater than a value obtained by adding a reference value to the leak flow rate of the braking oil from the second hydraulic circuit.

17. The oil leak detecting system of claim 12, wherein the controller is configured to determine that brake oil leaks in the second hydraulic circuit based on a leak flow rate of brake oil from the first hydraulic circuit being greater than a value obtained by adding a reference value to the leak flow rate of brake oil from the second hydraulic circuit.

18. The oil leak detecting system of claim 12, wherein the controller is configured to: close one of the first hydraulic circuit and the second hydraulic circuit,monitor the amount of leak of the other one hydraulic circuit which is not closed, anddetermine that no leak has occurred in the first and second hydraulic circuits based on an amount of leak being not greater than the preset value.

19. The oil leak detecting system of claim, wherein the controller is configured to determine that no leak has occurred in the first hydraulic circuit and the second hydraulic circuit based on a leak flow rate of brake oil from the first hydraulic circuit being not greater than a value obtained by adding a reference value to the leak flow rate of the braking oil from the second oil hydraulic circuit.

20. The oil leak detecting system of claim 19, wherein the controller is configured to determine that no leak has occurred in the first hydraulic circuit and the second hydraulic circuit based on a leak flow rate of brake oil from the second hydraulic circuit being not greater than a value obtained by adding a reference value to a leak flow rate of brake oil from the first fluid hydraulic circuit.