The hybrid electric vehicle has both a motor drive and an internal combustion engine drive. The motor is subjected to the optimization calculation of a feasible solution.

3.2 Electric operation commutation control technology In the electric operation state, the two-phase conduction six-state control method is adopted. Only two power switch tubes are turned on at any one time, which belong to the upper half bridge and the lower half bridge, respectively, but are not in the same Bridge arm, in the speed control, only the lower half of the bridge power switch works in the PWM state, as shown, gives the electric operation state control signal waveform.

Since only two phase windings are turned on at any one time, there are 6 commutation cycles per cycle. Assume that before the commutation% and conduction, then A, C two-phase power, its working circuit for the battery anode -Vi-A phase winding -C phase winding -V2 - livestock battery cathode, then iA = shaped wave air gap magnetic field waveform For the phase current and phase potential amplitude when the width of the flat top is greater than 120°, the average electromagnetic torque is: When the main control board issues a commutation command, Vi ends, V3 and V2 conduct, and iA still exists. Continue reading through The current diodes continue to flow until they disappear. When V3 and V2 are turned on, the two phases B and C are energized. The working circuit is the anode of the battery - V3 - B phase winding - the winding of the C phase - V2 - the negative electrode of the battery. During this process, the iB is increased from zero to I. The linear change of iA and iB, the time for iA to decrease from I to zero is ti, and the time for iB to increase from zero to I is t2, then the change process of the commutation current can be described as shown.

From equations (4) and (5), it can be seen that in order to suppress the fluctuation of the electromagnetic torque in the commutation phase, it is desirable that the commutation torque is also equal to the average electromagnetic torque Tn, which requires that ic be phase-commutated in A and B phases. During the process, a constant value is maintained, which is obtained by Equation (2): The current ic amplitude will not change, as shown in (b). When tl=t2, the current ic remains unchanged, so the magnitude of the commutation torque is constant 4. Here, the commutation process of a magnetic state at 60° electrical angle is analyzed, and the commutation process for the other 5 magnetic states is analyzed. It can be analyzed by the same reason, as long as the control of tl=t2 can suppress the commutation torque fluctuation.

3.3 Power generation operation control technology In the power generation operation state, the power control circuit Vi, V3, V5 of the half bridge of the power main circuit is fully closed by the control signal of the main control board, and the power tubes V2, V4, V6 of the lower half bridge are respectively pressed. Certain laws are used for PWM control. In this way, due to the presence of freewheeling diodes in the upper half of the bridge, the equivalent circuit appears to be the same half-controlled rectifier circuit. In addition, because the hybrid electric vehicle's power supply is a battery, when the motor enters the power generation operation, the generated voltage must be higher than the battery voltage in order to output the electric power. Therefore, the power generation operation control method adopts the PWM boost operation principle of semi-controlled rectification, however, When designing the motor, the output voltage of the highest rotating speed should not exceed the rated voltage of the battery. When the power is running at a low speed, the power tubes V2, V4, and V6 of the lower half-bridge can be used as the PWM work to generate the pump-up voltage. When the pump rise voltage is higher than the battery terminal voltage, the power is output. This process is controlled by the main control board.

As shown, the waveform of the power generation operating state control signal is given.

Magnetic power converted electric energy Wr Motor winding heat consumed electric energy W Motor inductance 2 (-M) Magnetic field energy released Set the motor inductance 2 (-M) The energy absorbed in the time period equals the energy released in the time period, namely Wl-W 'Combined with (9) and; motor weight; controller weight 6.8kg (water-cooled) In conclusion, the electric operation, power generation operation and braking operation are realized, and the use requirements of the hybrid electric vehicle driving system are met.

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