Text/Civil
Understanding the P2 motor architecture can be seen that because it needs to go through the gearbox, the efficiency of pure electric drive and kinetic energy recovery is discounted, so it is necessary to look at the P3 motor architecture.
The P3 motor architecture is to place the position of the motor behind the gearbox, which can have a certain distance from the gearbox, couple with the output shaft of the gearbox, and drive through gears or chains. The entire path is engine -clutch-gearbox-motor-reducer-wheel. In terms of functions, the P3 motor can realize braking energy recovery and pure electric drive vehicles.
Because the P3 motor architecture has separate space requirements, in theory, the rear-drive car is more suitable for the P3 motor architecture, after all, it can provide more space.
Advantages of the P3 motor architecture:
1, the efficiency of pure electric drive is higher, because the position of the P3 motor is connected to the transmission shaft behind the gearbox, so in the case of pure electric drive, it can drive the vehicle more directly and efficiently, reducing kinetic energy loss.
2, kinetic energy recovery ability is better, in the vehicle braking or downhill and other road conditions, the brake energy generated by wheel reversal can also be more directly fed back to the P3 motor through the drive shaft for charging.
Disadvantages of the P3 motor architecture:
1, compared with the P0-P2 motor, P3 motor can not be integrated with the gearbox or engine, so the entire structure needs a separate space to store, the corresponding need to occupy more body space.
2, because the P3 motor and the engine between the gearbox and clutch, so the motor can not undertake the start and stop work of the engine, so at this time it is necessary to add a P0 or P1 position of the motor to fill this function deficiency, while the power of the motor can not be too low.
3, although the P3 motor is in the rear of the gearbox, but in the case of pure electric drive, it is still necessary to drive the gearbox in front, so the gearbox will cause some unnecessary energy losses.
Since the position of the gearbox in the P3 architecture is awkward, replace it. So the engineer removed most of the transmission's gears, leaving only a few gears. The combination of P1+P3 motors then forms the P1P3 hybrid system, which is the Honda i-MMD hybrid system.
The working mode of this hybrid architecture can be divided into:
1, pure electric drive: the battery for the P3 motor power, the clutch disconnected, the engine and P1 generator do not work, by the P3 motor alone to drive the vehicle.
2, the engine direct drive: when the vehicle driving situation in line with the efficient engine range, the clutch coupling, the engine will drive the vehicle alone, but because there is no transmission, the engine is difficult to achieve the efficient range, so this mode is relatively small.
3, series hybrid: the engine, P1 generator, P3 motor is connected in series, the engine drives the P1 generator to generate electricity, the electrical energy is transmitted to the P3 motor to drive the vehicle.
4. Parallel hybrid: the engine runs with the P3 motor to drive the vehicle.
5. Kinetic energy recovery mode: When going downhill or braking, the wheel drives the P3 motor to reverse to charge the battery.
It can be seen that the P3 motor can get better results with the motor in other positions.
summary:
Compared with the previous motor architecture, the P3 motor architecture no longer needs to go through the gearbox, so the pure electric drive and kinetic energy recovery efficiency are higher, and the disadvantage is that it occupies space and needs motors in other positions to assist. Compared with the P3 architecture alone, coupled with the P0 or P1 position of the motor, it is a good hybrid system.