US 9,981,642 B2Granted

Electric brake system and method thereof

AssigneeMando Corporation

InventorHak-Burm Kim

Life of this patent

Estimating the term…

Loading patent…

Abstract

Electronic brake system is disclosed. An electronic brake system includes, a pressure sensor including a first pressure sensor configured to measure a hydraulic pressure of the accumulator, a second pressure sensor configured to measure a hydraulic pressure of the first hydraulic circuit, and a third pressure sensor configured to measure a hydraulic pressure of the second hydraulic circuit, a driver including one or more apply valves and release valves configured to control the hydraulic pressures of the first hydraulic circuit and the second hydraulic circuit, a determiner configured to determine that at least one of the first hydraulic circuit and the second hydraulic circuit has failed when an absolute value of a slope of the pressure measured by the first pressure sensor is greater than a preset first threshold value and the pressure measured by the first pressure sensor is less than a preset second threshold value and a controller configured to close apply valves of the first hydraulic circuit and the second hydraulic circuit when the failure has been determined, determine that a leak has occurred in one of the first and second hydraulic circuits having an amount of pressure change greater than that of the other hydraulic circuit measured on the basis of the second pressure sensor and the third pressure sensor, and control braking using only the hydraulic circuit operating normally.

Claims12

Dependent claims

An electronic brake system including a motor configured to drive a pump for pumping brake oil from a reservoir of a master cylinder, an accumulator configured to store the pumped brake oil according to operation of the pump driven by the motor, a first hydraulic circuit configured to control a hydraulic pressure generated by the accumulator to be transmitted to at least one first wheel, and a second hydraulic circuit configured to control the hydraulic pressure generated by the accumulator to be transmitted to at least one second wheel, the electronic brake system comprising:

a pressure sensor including a first pressure sensor configured to measure a hydraulic pressure of the accumulator, a second pressure sensor configured to measure a hydraulic pressure of the first hydraulic circuit, and a third pressure sensor configured to measure a hydraulic pressure of the second hydraulic circuit;
a driver including one or more apply valves and release valves configured to control the hydraulic pressures of the first hydraulic circuit and the second hydraulic circuit;
a determiner configured to determine that at least one of the first hydraulic circuit and the second hydraulic circuit has failed when an absolute value of a slope of the pressure measured by the first pressure sensor is greater than a preset first threshold value and the pressure measured by the first pressure sensor is less than a preset second threshold value;
and
a controller configured to close apply valves of the first hydraulic circuit and the second hydraulic circuit when the failure has been determined, determine that a leak has occurred in one of the first and second hydraulic circuits having an amount of pressure change greater than that of the other hydraulic circuit measured on the basis of the second pressure sensor and the third pressure sensor, and control braking using only the hydraulic circuit operating normally.

2 more elements

A control method of an electronic brake system including a motor configured to drive a pump for pumping brake oil from a reservoir of a master cylinder, an accumulator configured to store the pumped brake oil according to operation of the pump driven by the motor, a first hydraulic circuit configured to control a hydraulic pressure generated by the accumulator to be transmitted to at least one first wheel, and a second hydraulic circuit configured to control the hydraulic pressure generated by the accumulator to be transmitted to at least one second wheel, the control method comprising:

measuring a hydraulic pressure of the accumulator, a hydraulic pressure of the first hydraulic circuit, and a hydraulic pressure of the second hydraulic circuit;
driving valves included in the first hydraulic circuit and the second hydraulic circuit on the basis of the measured hydraulic pressure of the accumulator, the measured hydraulic pressure of the first hydraulic circuit, and the measured hydraulic pressure of the second hydraulic circuit;
determining that at least one of the first hydraulic circuit and the second hydraulic circuit has failed when a magnitude of a slope of the measured hydraulic pressure of the accumulator is greater than a preset first threshold value and the measured hydraulic pressure of the accumulator is less than a preset second threshold value;
closing apply valves included in the first hydraulic circuit and the second hydraulic circuit when the failure is determined;
determining that a leak has occurred in one of the first and second hydraulic circuits having an amount of hydraulic pressure change greater than that of the other hydraulic circuit measured on the basis of the hydraulic pressures of the first hydraulic circuit and the second hydraulic circuit measured after the apply valves are closed;
and
determining that one of the first and second hydraulic circuits having an amount of hydraulic pressure change less than that of the other hydraulic circuit measured on the basis of the hydraulic pressures of the first hydraulic circuit and the second hydraulic circuit measured after the apply valves are closed operates normally, and controlling braking of only the hydraulic circuit operating normally.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/422,387Filed 1 Feb 2017
Priority: KR 10-2016-00128352 Feb 2016
Published: US 2017/0217415 A13 Aug 2017
Granted: 29 May 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

B60T 13/145
Systems with master cylinder: master cylinder integrated or hydraulically coupled with booster
B60T 7/042
Foot actuated: by electrical means, e.g. using travel or force sensors
B60T 8/171
Using electrical or electronic regulation means to control braking: detecting parameters used in the regulation; Measuring values used in the…
B60T 8/172
Using electrical or electronic regulation means to control braking: determining control parameters used in the regulation, e.g. by calculations…