By HEV(Hybrid Electric Vehicle), we refer to a vehicle which can be both fuel driven and electricity driven. Its advantage lies in the engine always maintaining the optimum working condition with excellent power performances，low fuel consumption and a low emission level.
A hybrid powertrain system can be classified into three types, namely the serial, the parallel and SPI according to the hybrid configurations. The weakness of the serial layout is its mechanical inefficiency due to repeated power conversions. In contrast to the serial, the parallel layout uses an engine as the main power and an electric motor as the auxiliary power.
The Syne system adopts the SPI configuration, which not only reduces both fuel consumption and emission level when running at low speed and with light workload, but also decreases energy loss resulting from frequent braking. Thus compared with vehicles of the same size, the Syne system burns less fuel. Moreover, the electric motor, although used as the auxiliary power, generates a more powerful starting and quicker acceleration, which is most suitable for buses running in urban areas.
When the vehicle starts or runs below a certain speed, the combustion engine runs idle while at the same time drives the generator, which in turn drives the motor. The vehicle runs entirely on power generated by the motor.
After it reaches a certain speed, the engine and the motor are coupled and co-running in accordance with the best matched load curve. The vehicle is driven by both the engine and the motor, thus the speed is raised as a result.
When the engine exerts enough output torque to run the vehicle, the MCU issues a command to stop the motor so that the engine alone powers the vehicle.
In the engine-works-alone mode, if extra power is needed as during acceleration and uphill drive, the motor resumes work under the command of the MCU. And the process is repeated again and again.
When the vehicle runs below a certain speed, the engine runs idle while the motor works alone. Meanwhile, the PM generator starts working at the command of the MCU, providing power to the drive motor to keep the vehicle running at a low speed.
During braking and other forms of deceleration, the high-output motor functions as a large capacity generator. The system functions as an efficient regenerative braking system recovering the vehicle's kinetic energy as electrical energy. The recovered energy is then stored in high-performance battery to be used in the next cycle. Operating Mode
◆Power generation during driving:Automatic clutch detaches,the engine runs idle while at the same time drives BSG motor,which in turn drives the motor.The vehicle runs entirely on power generated by the motor;
◆Synchronizing automatic clutch mode:BSG motor regulates speed of engine,while automatic clutch smoothly clutches;
◆EV driving mode:Automatic clutch detaches,the motor drives the vehicle,while the BSG motor drives accessories;
◆Engine driving mode:Automatic clutch clutches,the engine drives the vehicle and accessories;
◆Engine+motor driving mode:Automatic clutch clutches,the engine and the motor drive the vehicle together,which results in better acceleration;
◆Regenerative braking mode:Automatic clutch detaches,the motor recovers energy when braking and generates power;
◆Power generation when pulling up: Automatic clutch detaches,the engine runs idle and drives the BSG motor.Power generated by BSG motor is used for battery. |
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