| 摘要 |
The present invention relates to an operation method of a brake system, easy to estimate a wheel pressure in active controllable electronic stability control (ESC) integrated regenerative braking. According to the present invention, the operation method comprises the following steps: transferring a valve operation command to an inlet valve to supply brake oil to a wheel brake cylinder and an outlet valve to collect the brake oil supplied to the wheel brake cylinder to a reservoir; calculating a valve operation time of the inlet and the outlet valve based on a both-end pressure difference of the inlet and the outlet valve; determining whether or not it is a linear control command with an increased pressure in comparison with the previous both-end pressure difference based on the both-end pressure difference; in case of the linear control command, performing linear control to calculate a flow rate of the brake oil passing the inlet valve based on a pressure increase slope and a pressure-volume line diagram corresponding to the both-end predetermined difference and the valve operation time; and estimating a pressure of the wheel brake cylinder based on the flow rate, the previous flow rate of the inlet valve, and a passing flow rate of the outlet valve. |
