*Technology/project introduction (background, status, characteristics, etc.): The hydraulic hybrid system consists of hydraulic pump/motor, hydraulic control valve, hydraulic accumulator, ECU controller, working status sensor, etc., and is installed in buses, taxis, sanitation vehicles, etc., which operate under urban conditions and have frequent starts and frequent stops, are called hydraulic hybrid vehicles. At work: A hydraulic pump is used to recover the braking energy of the vehicle and store it in a hydraulic accumulator, and a hydraulic motor is used to release the energy in the hydraulic accumulator to drive the vehicle to start. Its highlight is that hydraulic hybrid vehicles can save energy by more than 15% year-on-year, reduce emissions by more than 30%, and eliminate starting black smoke. Because of its high cost performance, it is currently a new energy vehicle technology that is relatively easily accepted by the market.  The key technologies of the hydraulic hybrid power system are: to build a braking energy recovery and release system based on hydraulic power. The system and the vehicle can be effectively connected. By controlling the smooth switching of engine power and hydraulic power during starting, braking and parking, energy release and recovery can be achieved. The hydraulic hybrid power system consists of hydraulic motors/hydraulic pumps, hydraulic valves, hydraulic accumulators and electronic controllers. Its role is to recover the vehicle's slow-down parking kinetic energy into the hydraulic accumulator in the form of pressure energy. When the vehicle starts, the pressure energy in the hydraulic accumulator is released and converted into hydraulic power to drive the vehicle to complete the starting process.  

*Main technical indicators: 1) Energy saving rate> 15%; 2) Emission reduction rate> 20%, no starting black smoke; 3) System weight <300 kg; 4) Maneuvability does not change driver operating habits; 5) Supporting use for City buses with a length of more than 9 meters (including active buses) 

*Current application status: 20 passenger buses have been demonstrated in Shenfu Passenger Transport, 2 Foshan buses, 1 Zhengzhou bus, 2 Xiamen bus Company, and 1 Wuhan bus company. Technical personnel from the National Motor Vehicle Products and Quality Supervision and Inspection Center conducted energy consumption testing on our company's hydraulic hybrid electric buses. After accurate testing, our company's hydraulic hybrid electric buses can achieve fuel saving by more than 28%.  

*Application prospects of "civilian joining the army" or "military conversion": Hydraulic hybrid power systems can use this technology in military energy-saving and emission reduction power plants, effectively improving the efficiency of special vehicles that are frequently started and braked.