Byd Company Limited

Yingwu Xu

Nan Liu

Xiaohua Tang

Jian Gong

Guangming Yang

Xuguang Zhou

Ming Chang Yu

Kai Liu

Xianhong Jiang

Qiaoqiao Wu

Ting Luo

Ming Yu

A method and an apparatus for controlling output torque of a motor for an electric vehicle in downhill mode comprises following steps: detecting a tilt angle value &#x3b8;, a current vehicle speed value V and an accelerator-pedal travel value Gain of the vehicle, determining whether the vehicle is in downhill mode or not, and if the result is positive, then calculating a downhill slip torque Tof the vehicle under the tilt angle value &#x3b8;, obtaining a maximum output torque T, calculating an output torque T of the motor based on T, T, Gain and a given vehicle speed delimitative value V, and controlling the motor to output the calculated output torque T. The present invention ensures the vehicle speed not too high by controlling the output torque of an electric vehicle in downhill mode, even if the brake-pedal travel is zero.

Method and apparatus for controlling output torque of a motor for an electric vehicle in downhill mode

The present invention provides an apparatus and method for controlling an accelerator for electric vehicles. The method comprises steps of: acquiring an actual accelerator pedal depth value and a current vehicle speed; determining a maximum output torque of motor under the current vehicle speed based on the current vehicle speed; and controlling the output torque of motor in such a way that the growth rate of the output torque higher than that of the actual accelerator pedal depth value at the beginning and then closed to that of the actual accelerator pedal depth value during the actual accelerator pedal depth value growing. The invention makes the output torque grown rapidly within the shallow range of accelerator pedal depth, while makes the output torque grown closed to that of the accelerator pedal depth within the relative deep range of accelerator pedal depth. Thus during the initial stage of acceleration, the vehicle may rapidly output a bigger torque, with an excellent dynamic response, to improve the driving comfort.

Apparatus and method for controlling an accelerator for electric vehicles

The present invention provides a clutch engaging control method in a hybrid power output device, wherein the device comprises an engine, a first motor, a clutch and a second motor that are connected in sequence, a battery, and a speed reducing mechanism and a drive shaft that are connected to the output end of the second motor; the method comprises: (a) detecting the rotation speed &#x3c9;of the second motor and setting the rotation speed &#x3c9;as the target rotation speed &#x3c9;of the first motor, when the vehicle is driven by the second motor and the engine is required to be started to provide assistance to the second motor; (b) starting the first motor to drive the engine, and controlling the actual rotation speed &#x3c9;of the first motor to be close to the target rotation speed &#x3c9;; (c) switching the state of the first motor from a driving motor to a power generator when the actual rotation speed &#x3c9;of the first motor is approximately equal to the target rotation speed &#x3c9;; and (d) engaging the clutch. The method can improve the dynamic response time of the engine and suppress impact in the clutch engaging process. The present invention further provides a clutch engaging control system in a hybrid power output device.

Clutch engaging control method and control system in hybrid power output device

This invention provides methods for electric vehicle motor control and rotor position detection and fault-tolerant processing. The rotor position signal sampled by the system is compared with the previous rotor position &#x3b8;. When there is a sudden change, the current position signal acquired is discarded. Instead, a fault-tolerant processing strategy for use during an error condition is employed where the previous sampled rotor position &#x3b8;is used as a base to determine the corrected current rotor position angle &#x398;'. Then the correcting value is used to control the electric motor. Thus, during the motor operation, when the detection of the motor rotor position is erroneous because of a sensor such as a revolver that may be interfered by external conditions such as electromagnetic fields or vibrations or when there is a breakdown in other related hardware components or transmitting circuits, the fault-tolerant processing methods of this invention can effectively prevent the motor from losing control and allow it to maintain its continuity and stability.

Methods for electric vehicle motor control and rotor position detection fault-tolerant processing

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Shanghai, China

Yingwu Xu