There is a "DTC" button in the middle of the air conditioning outlet above the car center console. When you press it, the dashboard shows DTC on. DTC is direct torque control, which is a way for inverter to control the torque of three-phase motor.
The method is to calculate the estimated values of motor flux linkage and torque according to the measured motor voltage and current, and then control the motor speed after controlling the torque. Direct torque control is a patent of ABB in Europe. In direct torque control, the stator voltage is integrated. The torque is estimated by the estimated stator flux linkage and the measured current vector inner product.
Flux and torque will be compared with reference values. If the error between the magnetic flux or torque and the reference value exceeds the allowable value, the power crystal in the frequency converter will be switched to reduce the error of the magnetic flux or torque as soon as possible.
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The control mode of the engine is to input the optimal driving torque to the driving wheels according to the road conditions, and the specific methods include changing the fuel injection amount, ignition time and throttle opening. The above two methods can be used separately or in combination. Engine torque control is adopted, but the response speed is slower than that of braking mode.
Another essential problem is that the optimal driving control cannot be realized on the road surface with asymmetric adhesion coefficient, and its efficiency is similar to that of the low-selected ABS control system. In order to achieve the optimal control of driving force, that is, to maximize the economy, power, directional stability and maneuverability of the car. At present, it is developing in the direction of comprehensive control of engine torque and wheel braking.