Automated Manual Transmission Shift Strategy for Parallel Hybrid Electric Vehicle

For the parallel hybrid electric vehicles in which there are one engine and one motor, and the motor is located before the transmission, the motor torque is added as a new parameter to develop a new shift strategy for automated manual transmissions. The design rule of the shift strategy is to pursue a better fuel economy without sacrificing performance of the vehicle. Upshift strategies in four driving modes and downshift strategies in driving mode and in braking mode are discussed in detail respectively. Simulations show that the new three-parameter shift strategy is able to save fuel consumption in driving mode and regenerate more energy in braking mode.