Patent KR-20070063782-A (KR)
Title: Electronic control unit of vehicle
Inventor: JUNG JI HYUN
IPC: B60T8/58
Filed: 2005-12-15
Abstract: An electronic control unit of a vehicle is provided to lower down the cost and to make maintenance easy by performing both electronic stability control and tire pressure monitoring using one microprocessor. The invention relates to an electronic control unit of a vehicle having an electronic stability program and a tire pressure monitoring system capable of performing both vehicle stability control and tire pressure monitoring using a single microprocessor, wherein the vehicle stability control system comprises a measurement unit(310), an ESP ECU(320), an ABS control unit(330) and a TCS control unit(340). The measurement unit contains a wheel speed sensor(311) detecting the speed of four wheels, a vertical acceleration sensor(312) detecting the vertical acceleration of a vehicle, a steering angle sensor(313) detecting the steering angle of a steering handle, a horizontal acceleration sensor(314) detecting the horizontal acceleration of a vehicle and a yaw-rate sensor(315) detecting a yaw rate of a vehicle, the ESP ECU contains a vehicle speed estimation unit(321) estimating the standard speed of a vehicle using the detected value from the wheel speed sensor and the vertical acceleration sensor, a steering angle calculation unit(322) calculating a steering angle of a steering handle using the detected value from the steering angle sensor, a yaw-rate calculation unit(323) estimating the wanted yaw-rate of a driver using the standard speed and steering angle of a vehicle and the horizontal acceleration of the horizontal acceleration sensor, a yaw-rate error output unit(324) comparing the yaw-rate calculated from the yaw-rate calculation unit and the measured yaw-rate from the yaw-rate sensor and outputting the error of two yaw-rates, a yaw-rate error power calculation unit(326) calculating the power of yaw-rate error value outputted from the yaw-rate error output unit, a vehicle acceleration power calculation unit(325) inputting the vertical acceleration outputted from the vertical acceleration sensor and the horizontal acceleration outputted from the horizontal acceleration sensor and outputting the power of vehicle acceleration, a vehicle acceleration calculation unit(328) inputting the vehicle acceleration power value calculated from the vehicle acceleration power calculation unit and outputting vehicle acceleration, a road friction coefficient estimation unit(327) inputting the yaw-rate error power value outputted from the yaw-rate error power calculation unit and the vehicle acceleration value outputted from the vehicle acceleration calculation unit and estimating the road friction coefficient and a TPMS control unit(358) monitoring the pressure of a tire and generating alarm and control signals accordingly, the ABS control unit performs vehicle braking control in an ABS mode by inputting the estimated frictional coefficient from the road friction coefficient estimation unit, and the TCS control unit performs vehicle acceleration control in a TCS mode by inputting the estimated frictional coefficient from the road friction coefficient estimation unit.