47results about How to "Wide power coverage" patented technology

The invention aims at providing a gas-electric series-parallel type ship hybrid power system with a fuel cell. The gas-electric series-parallel type ship hybrid power system with the fuel cell comprises a gas machine, an electric motor and a power generator; the output end of the gas machine is connected with the first input end of a gearbox through a permanent magnet coupler; the output end of the electric motor is connected with the second input end of the gearbox through a first clutch; the input end of the power generator is connected with the first output end of the gearbox through a second clutch; the second output end of the gearbox is connected with a propeller; a liquefied natural gas tank is connected with a gas supply device; the gas supply device is connected with the gas machine and the fuel cell; the fuel cell, a storage battery, a ship load, an inverter and a rectifier are all electrically connected with a distributing board; the inverter is electrically connected with the electric motor through a frequency converter; and the power generator is electrically connected with the rectifier. According to the gas-electric series-parallel type ship hybrid power system withthe fuel cell, the operation efficiency of the gas machine and the operation efficiency of the electric motor are further enhanced, the fuel consumption and emission of the gas machine are effectivelyreduced, and the power response of a ship is improved.

The purpose of the invention is to provide a dual-shaft ship hybrid power system with a fuel cell. The system comprises a diesel engine, a gas machine, a fuel cell and a storage battery; the gas machine is connected to a first reversible shaft motor; the first reversible shaft motor is connected with a gear case; the diesel engine is connected with a second reversible shaft motor; the second reversible shaft motor is connected with the gear case; the gear case is connected with two propellers; a liquefied natural gas tank is connected with a gas supply device; the gas supply device is connected with the gas machine and the fuel cell; the fuel cell, the storage battery, a ship load, an inverter and a rectifier are all electrically connected with a distributing board; the inverter is connected to the first reversible shaft motor and the second reversible shaft motor through a frequency converter, and the first reversible shaft motor and the second reversible shaft motor are electricallyconnected to the rectifier. The invention can meet the requirements of the ship under various environments and working conditions, further improve the operating efficiency of the gas machine, the diesel engine and the reversible shaft motor, and effectively reduce the fuel consumption and emission of the engine.

The invention aims at providing a dual-shaft type gas-electric hybrid ship power system. The whole dual-shaft type gas-electric hybrid ship power system comprises a gas machine, a reversible shaft driven motor, a storage battery, a permanent magnet coupler, a clutch, a gearbox, a propeller, a natural gas storage and supply device, an inverter, a frequency converter, a rectifier and a switchboard.The dual-shaft type gas-electric hybrid ship power system is mainly characterized in that the gas machine is connected with the reversible shaft driven motor through the permanent magnet coupler; thereversible shaft driven motor is connected with the gearbox through the clutch; and the power source is the storage battery. According to the dual-shaft type gas-electric hybrid ship power system, theadopted layout of multiple energy forms can meet demands of a ship under various environments and working conditions, the operation efficiency of the gas machine and the reversible shaft driven motoris further enhanced, the fuel consumption and emission of the gas machine are effectively reduced, the power response of the ship is improved and the application range of the system is wide.

The invention discloses an electric automobile power supply free of external charging. The electric automobile power supply comprises an energy storage cell which is used for charging a power cell or directly driving a motor, an energy storage cell control unit which is used for controlling the energy storage cell and adjusting the start and stop and the output power of the energy storage cell by controlling the gas, water and heat inside the energy storage cell, the power cell which is used for directly providing electric energy for the motor and maintaining the normal rotating power of the motor in an electric automobile through receiving the electric energy which is provided by the energy storage cell, a power cell management unit which is used for controlling the discharging and the charging of the power cell, a DC (Direct Current) / DC (Direct Current) converting unit which is used for converting the direct current voltage which is fluctuant in a fixed range into the voltage which can be loaded on the power cell, and a power system control unit which is used for adjusting the power generation of the energy storage cell and the charging and discharging of the power cell, and providing the electric energy for the motor. According to the electric automobile power supply free of external charging, a fuel cell is used as the energy storage cell and used for assisting electricity supply, the real-time charging of the electric automobile is realized, and an external charging interface is not needed.

The invention aims to provide a gas-electric hybrid type ship hybrid power system with a super capacitor. The system comprises a gas machine, the super capacitor, a propeller, a natural gas storage and supply device and a ship load. The output end of the gas machine is connected with the input end of a gearbox, and the input end of a power generator is connected with the output end of the gas machine through a belt transmission transposition; the output end of the gearbox is connected with a motor, and the super capacitor, the power generator and a storage battery serve as power sources. The arrangement of various energy forms adopted by the system can meet requirements of ships under various environments and working conditions; the super capacitor is used for storing or releasing energy when the system load is changed so as to prevent the impact of the excessively quick energy change on a power grid, the operation efficiency of the gas machine, the power generator and the motor is improved, the utilization efficiency of fuel is improved, emission is reduced, the power response of the ships is improved, the application range of the system is enlarged, and the utilization rate of the fuel is further improved.

The purpose of the invention is to provide a gas-electric parallel ship hybrid power system with fuel cells. The system comprises a gas machine, a fuel cell, a reversible motor and a gear case; the gear case comprises an input end, an output end and an input / output end; the output of the gas machine is connected to the input of the gear case via a permanent magnet coupler; the output / input end ofthe reversible motor is connected to the input / output end of the gear case via a clutch, the output end of the gear case is connected to a propeller, and a LNG tank is connected to a gas supply device; the gas supply device is connected to the gas machine and the fuel cell, and the fuel cell, the battery, the ship load, the inverter, and the rectifier are electrically connected to a power distribution board, and the inverter is electrically connected to the reversible motor through a frequency changer, and the reversible motor is connected to the rectifier. The various energy forms arranged bythe invention can meet the requirements of the ship under various environments and working conditions, effectively reduce the fuel consumption and emissions of the gas machine, and improve the dynamic response of the ship.

The purpose of the invention is to provide a dual-engine dual-oar gas-electric hybrid ship power system. The whole system is composed of gas engines, reversible motors, a storage battery, a permanentmagnetic coupler, clutches, a gear case, a propeller, a natural gas storage and supply device, an inverter, a frequency converter, a rectifier and a distributing board. The main features of the systemare as follows: two gas engines are connected to the gear case through the permanent magnet coupler, and two reversible motors are connected to the gear case through the clutches, and the power source is the storage battery. The arrangement of various energy forms adopted by the invention can meet the requirements of the ship under various environments and working conditions, further improve theoperating efficiency of the gas machine and the reversible motor, and effectively reduce the fuel consumption and discharge of the gas machine. At the same time, the dynamic response of the ship is improved, and the system has a wide range of applications.

The purpose of the invention is to provide a gas-electric hybrid type ship hybrid power system with LNG cooling. The system includes a gas engine, a generator, motors and a natural gas storage and supply device. The gas engine is connected to a gear case through a shaft motor. The motors are connected to the gear case through clutches. The propellers are connected to the motors. An engine coolingsystem and a fuel cell cooling system are connected to an LNG gasification heat exchanger. An electric power source is a fuel cell, the generator and a storage battery. The gas-electric hybrid type ship hybrid power system with the LNG cooling can meet requirements of ships in various environment and working conditions through the adopted arrangement of a plurality of energy forms, improves running efficiency of the gas engine, the shaft motor and the motors, and utilizes LNG gasification cold energy so as to reduce the power of a heat dissipation fan and a liquid coolant circulating pump, reduce the area of a radiator and improve the integration of the system, further improves the utilization efficiency of fuel and reduces emission, thereby improving the power response of the ships, improves an application range of the system, and further improves the utilization rate of fuel.

The invention discloses a valve used for a diesel engine exhaust gas recirculation system, which comprises a valve seat, and a valve body and a torque motor that are arranged on the valve seat; the valve body is provided with an exhaust gas inlet and an exhaust gas outlet; the valve body is internally provided with a valve cavity; the torque motor is fixed on the valve seat; the valve also comprises an eccentric cam plate, a valve rod and a torsion spring; the eccentric cam plate and the valve rod are arranged on an output shaft of the torque motor; the axis of the valve rod is vertical to the rotation axis of the eccentric cam plate; the upper rod part of the valve rod extends into the valve cavity, and a valve block is arranged at the end part of the upper rod part; the valve cavity is divided into an upper valve cavity and a lower valve cavity by the valve block, wherein the exhaust gas inlet is respectively communicated with the exhaust gas outlet by the upper valve cavity and the lower valve cavity; the lower rod part of the valve rod extends to the eccentric cam plate and is connected with the eccentric cam plate; and the valve rod is driven to do straight line motion by the rotating movement of the eccentric cam plate. The valve is simple in structure and can adjust the ratio between air and recycled exhaust gas only by one motor.

The invention aims to provide a ship ammonia-electricity hybrid power system with a heat storage-cooling battery heat management system. The ship ammonia-electricity hybrid power system comprises an ammonia fuel engine, a reversible motor, a diesel generator set, a storage battery, a capacitor, a fuel battery, a propeller, a liquid ammonia storage and supply device, a power transformation device,a ship mainstream power grid, a ship load, a whole ship cooling system and a waste heat system. Hybrid propulsion of the ammonia fuel engine and the motor and coordinated power supply of the diesel generator set and the energy storage unit can be achieved, multi-stage utilization of cold energy of the energy storage unit and the engine is achieved, and the waste heat system can achieve multi-stageheat energy utilization and is integrated with the cooling system.

The purpose of the invention is to provide a dual-motor coaxial gas-electric hybrid ship power system. The system includes a gas engine, a generator, motors, a storage battery, a fuel cell, clutches,a gear case, a propeller, a natural gas storage and supply device, substation devices, a shore power device, a ship power grid, and a ship load. The gas engine is connected to the gear case through the clutch. The first motor and the second motor are connected to the gear case through the clutches. The generator is connected to an output end of the gear case. The two motors are connected to each other through a shaft. An electric power source is the storage battery, the generator and the fuel cell. The dual-motor coaxial gas-electric hybrid ship power system adopts a plurality of energy form arrangements, has a plurality of working modes, can meet requirements of ships in various environment and working conditions, can maintain the gas engine and the motors in a high efficiency zone all the time, reduces the fuel consumption and discharge of the gas engine, improves the power response of ships, and enlarges seaworthiness of the ships.

The invention provides a single-engine single-propeller type gas-electric hybrid ship power system. The single-engine single-propeller type gas-electric hybrid ship power system comprises a gas engine, a storage battery and a gearbox, the output end of the gas engine is connected with the input end of the gearbox through a permanent magnet coupler, the output / input ends of a reversible motor are connected with the input / output ends of the gearbox through a clutch, and the output end of the gearbox is connected with a propeller. A liquefied natural gas tank is connected with a gas supply devicein a gas mode, the gas supply device communicates with the interior of the gas engine, the storage battery, ship load, an inverter and a rectifier are all connected to a distribution board, the inverter is connected with the reversible motor through a frequency converter, and the reversible motor is electrically connected with the rectifier. The layout of various energy forms adopted by the single-engine single-propeller type gas-electric hybrid ship power system can meet the needs of ships in various environments and operating conditions, further improves the operation efficiency of the gasengine and the reversible motor, effectively reduces fuel consumption and emission of the gas engine, improves the dynamic response of the ships simultaneously, and the system has a wide range of application.

The invention provides a hybrid power ship mode switching control strategy. According to the mode switching control strategy, firstly, a hybrid power operation mode is divided into four modes of motor independent propulsion, gas machine independent propulsion, gas machine and motor combined propulsion and charging propulsion. The strategy is mainly characterized by comprising the following steps: firstly, calculating the total torque demand required by the ship during operation, and formulating a mode switching control rule by taking optimization of the operation efficiency of a gas engine as a principle according to the operation demand torque and the value of the SOC of a power battery; and when the operation condition of the hybrid power system changes and the mode switching condition is met, the hybrid power assembly controller coordinates all parts of the power system to be switched to the target mode. The target mode of the hybrid power system when the operation condition is changed is formulated according to the ship operation demand torque and the power battery, the system operation efficiency is improved, fuel oil is saved, the operation performance of the hybrid power ship is improved, and the service life of the power battery is prolonged.

The purpose of the invention is to provide a single-engine double-propeller gas-electric hybrid ship power system with a fuel cell. The system includes a gas engine, a generator, motors, the fuel cell, a storage battery, clutches, a gear case, propellers, a natural gas storage and supply device, a substation device, a shore power device, a ship power grid, and a ship load. The gas engine is connected to the gear case through the clutch. The motors and the generator are connected to the gear case through the clutches. The propellers are directly connected to output ends of the motors. An electric power source is the fuel cell, the storage battery and the generator. The single-engine double-propeller gas-electric hybrid ship power system with the fuel cell adopts a plurality of energy form arrangements, has a plurality of working modes, can meet requirements of ships in various environment and working conditions, can maintain the gas engine and the motors in a high efficiency zone all the time, reduces the fuel consumption and discharge of the ship power system, improves the power response of ships, and enlarges seaworthiness of the ships.

The purpose of the invention is to provide a gas-electric parallel ship hybrid power system with LNG cooling. The system includes gas engines, a reversible motor, a fuel cell and a storage battery. The two gas engines are connected to input ends of a gear case through clutches. The reversible motor is connected to the gear case through a clutch. A propeller is connected to an output end of the gear case. An engine cooling system and a fuel cell cooling system are connected to an LNG gasification heat exchanger. The gas-electric parallel ship hybrid power system with LNG cooling can meet requirements of ships in various environment and working conditions through the adopted arrangement of a plurality of energy forms and a plurality of working modes, improves running efficiency of the gas engines and the reversible motor, and utilizes LNG gasification cold energy so as to reduce the power of a heat dissipation fan and a liquid coolant circulating pump, reduce the area of a radiator and improve the integration of the system, thereby improving the utilization efficiency of fuel, reducing emission and improving an application range of the system.

The purpose of the invention is to provide a double-engine single-propeller ship hybrid power system with a fuel cell. The system includes gas engines, a generator, a motor, a storage battery, the fuel cell, clutches, a gear case, a propeller, a natural gas storage and supply device, a substation device, a shore power device, a ship power grid, and a ship load. The gas engines are connected to thegear case through the clutches. The motor and the generator are connected to the gear case through the clutches. An electric power source is the storage battery, the generator and the fuel cell. Thedouble-engine single-propeller ship hybrid power system with the fuel cell adopts a plurality of energy form arrangements, has a plurality of working modes, can meet requirements of ships in various environment and working conditions, can maintain the gas engine and the motor in a high efficiency zone all the time, reduces the fuel consumption and discharge of the gas engine, improves the power response of ships, and enlarges seaworthiness of the ships.

The invention aims to provide a double-shaft double-motor ship ammonia-electricity hybrid power system with a fuel cell. The system comprises an ammonia fuel engine, a first reversible motor, a secondreversible motor, a third reversible motor, a diesel generator set, a storage battery, a super capacitor, a fuel cell, a propeller, a liquid ammonia storage and supply device, a power transformationdevice, a ship power grid, a ship load, a whole ship cooling system and an exhaust gas recirculation system. Hybrid propulsion of the ammonia fuel engine and the motor and coordinated power supply ofthe diesel generator set and the energy storage unit can be achieved. Meanwhile, multi-stage utilization of cold energy of the energy storage unit and the engine is achieved, waste gas of the fuel cell supplements gas for the waste gas turbine, the gas inlet efficiency is improved, ship energy consumption is reduced, the whole ship efficiency is improved, and the application range of the system iswidened.

The purpose of the invention is to provide a gas-electric hybrid ship power system with generator set parallel operation. The system includes gas engines, a generator, a motor, a storage battery, a fuel cell, clutches, a gear case, a propeller, a natural gas storage and supply device, substation devices, a shore power device, a ship power grid, and a ship load. Output ends of the gas engines are connected to input ends of the gear case. The motor and the generator are connected to output ends of the gear case through the clutches. An electric power source is the storage battery, the generatorand the fuel cell. The gas-electric hybrid ship power system with the generator set parallel operation adopts a plurality of energy form arrangements, realizes a plurality of working modes by openingand closing the clutches, can meet requirements of ships in various environment and working conditions, can maintain the gas engine and the motor in a high efficiency zone all the time, reduces the fuel consumption and discharge of the gas engine, improves the power response of the ships, and enlarges seaworthiness of the ships.

The invention aims to provide an ammonia-electricity hybrid power system of an alternating-current and direct-current main network ship. The system comprises an ammonia fuel engine, a first reversiblemotor, a second reversible motor, a third reversible motor, a hoisting motor, a diesel generator set, a storage battery, a capacitor, a fuel cell, a propeller, a liquid ammonia storage and supply device, a power transformation device, a ship power grid, a ship load and a whole ship cooling system. Hybrid propulsion of an ammonia fuel engine and double motors, coordinated power supply of a dieselgenerator set and an energy storage unit, cooperative work of an AC main network and a DC main network and multi-stage utilization of cold energy of the energy storage unit and the engine can be achieved, ship energy consumption is reduced, the whole ship efficiency is improved. The system is provided with a hoisting motor and is suitable for specific large ships.

The invention relates to a double-shaft four-machine type ship hybrid power system and a propulsion control method thereof. The hybrid power system comprises two sets of independent power devices. Theoutput end of a main push diesel engine is connected with the input end of a gearbox through a clutch; the input / output end of a propulsion motor is connected with the input / output end of the gearbox; the output end of the gearbox is connected with the input end of a full-revolving steering oar; a first group of power transmission lines of the propulsion motor are connected with a first group ofterminals of a distribution board through a propulsion motor end rectifier; a second group of terminals of the distribution board are connected with an energy storage unit; and a third group of terminals of the distribution board are connected with a second group of power transmission lines of the propulsion motor through a propulsion motor end inverter and a frequency converter in sequence. The power system is wide in power coverage range, on the one hand, power redundancy is increased, the reliability of the power system is improved, and on the other hand, multiple working modes are provided, and the requirements of various ship environments and working conditions are met.

The purpose of the invention is to provide a double-engine single-propeller gas-electric hybrid ship power system. The system includes gas engines, a generator, a motor, a storage battery, clutches, agear case, a propeller, a natural gas storage and supply device, substation devices, a shore power device, a ship power grid, and a ship load. The first gas engine and the second gas engine are connected to the gear case through the clutches. The motor and the generator are connected to the gear case through the clutches. An electric power source is the storage battery, the generator and a fuel cell. The double-engine single-propeller gas-electric hybrid ship power system adopts a plurality of energy form arrangements, has a plurality of working modes, can meet requirements of ships in various environment and working conditions, can maintain the gas engines and the motor in a high efficiency zone all the time, reduces the fuel consumption and discharge of the gas engines, improves the power response of ships, and enlarges seaworthiness of the ships.

The purpose of the invention is to provide a three-engine double-propeller diesel-gas-electric hybrid ship power system. The system includes gas engines, a diesel engine, a generator, a motor, a storage battery, clutches, gear cases, propellers, a natural gas storage and supply device, substation devices, a shore power device, a ship power grid, and a ship load. The first gas engine, the second engine and the diesel engine are connected to the gear cases through the clutches. The motor and the generator are connected to the gear cases through the clutches. An electric power source is the storage battery and a reversible motor (a generator mode). The three-engine double-propeller diesel-gas-electric hybrid ship power system adopts a plurality of energy form arrangements, has a plurality ofworking modes, can meet requirements of ships in various environment and working conditions, can maintain the gas engines and the motor in a high efficiency zone all the time, reduces the fuel consumption and discharge of the gas engines, improves the power response of ships, and enlarges seaworthiness of the ships.

The invention aims to provide a double-host and double-motor ship ammonia-electricity hybrid power system with a battery thermal management function. The system comprises an ammonia fuel engine, a diesel engine, reversible motors, diesel generator sets, a storage battery, a capacitor, propellers, a liquid ammonia storage and supply device, power transformation devices, a ship power grid and a whole ship cooling system; the diesel generator sets, the storage battery and the capacitor are connected with the ship power grid through frequency conversion devices; the ship power grid is connected with ship daily load and each reversible motor through the power transformation devices; the first reversible motor is connected with the ammonia fuel engine through a belt crankshaft; the first reversible motor and the second reversible motor are respectively connected with the diesel engine and the ammonia fuel engine through clutches and then drive the variable-pitch propeller through a gear box;and the third reversible motor and the fourth reversible motor directly drive the fixed-pitch propellers. Hybrid propulsion of the ammonia fuel engine, the diesel engine and the motors and multi-stage utilization of cold energy of an energy storage unit and the engines can be achieved.

The purpose of the invention is to provide a double-engine three-propeller type ship hybrid power system with composite energy storage. The system includes gas engines, a generator, a motor, pod propellers, and a natural gas storage and supply device. Output ends of the gas engines are connected to input ends of the gear case. An input end of the generator is connected to an output end of a gear case. The output end of the gear case is connected to the motor. Propellers are connected to an input end of the motor. The pod propellers are connected to a ship power grid. An electric power source is a supercapacitor, a fuel cell, the generator and a storage battery. The double-engine three-propeller type ship hybrid power system with the composite energy storage can quickly shore or release energy when a load of the system changes to prevent impact of the too fast energy change on the power grid, improves running efficiency of the gas engines, the generator and the motor, improves the utilization efficiency of fuel, reduces emission, improves the power response of the ships, improving an application range of the system, and further improves the utilization rate of fuel.

The purpose of the invention is to provide a gas-electric hybrid type ship hybrid power system with composite energy storage. The system includes gas engines, generators, motors, propellers, and a natural gas storage and supply device. Output ends of the gas engines are connected to input ends of the gear case. Input ends of the generators are connected to output ends of the gear case. The outputends of the gear case are connected to the motors. The propellers are connected to input ends of the motors. An electric power source is a supercapacitor, the generators and a storage battery. The gas-electric hybrid type ship hybrid power system with the composite energy storage can meet requirements of ships in various environment and working conditions through the adopted arrangement of a plurality of energy forms, form a composite energy storage system by using the supercapacitor, the generators and the storage battery, solves the problems of low electric energy quality of a ship power grid and short life of the storage battery, can quickly shore or release energy when a load of the system changes to prevent impact of the too fast energy change on the power grid, improves running efficiency of the gas engines, the generators and the motors, improves the utilization efficiency of fuel, reduces emission, and improves the power response of the ships.

The invention aims at providing a dual-shaft type gas-electric hybrid ship power system. The whole dual-shaft type gas-electric hybrid ship power system comprises a gas machine, a reversible shaft driven motor, a storage battery, a permanent magnet coupler, a clutch, a gearbox, a propeller, a natural gas storage and supply device, an inverter, a frequency converter, a rectifier and a switchboard.The dual-shaft type gas-electric hybrid ship power system is mainly characterized in that the gas machine is connected with the reversible shaft driven motor through the permanent magnet coupler; thereversible shaft driven motor is connected with the gearbox through the clutch; and the power source is the storage battery. According to the dual-shaft type gas-electric hybrid ship power system, theadopted layout of multiple energy forms can meet demands of a ship under various environments and working conditions, the operation efficiency of the gas machine and the reversible shaft driven motoris further enhanced, the fuel consumption and emission of the gas machine are effectively reduced, the power response of the ship is improved and the application range of the system is wide.

The purpose of the invention is to provide a gas-electric hybrid type ship hybrid power system with PTI-PTO. The system includes a gas engine, a generator, a motor, a storage battery, a fuel cell, clutches, a gear case, a propeller, a natural gas storage and supply device, substation devices, a shore power device, a ship power grid, and a ship load. An output end of the gas engine is connected toan input end of the gear case. The PTI motor and the PTO generator are connected to output ends of the gear case through the clutches. An electric power source is the storage battery, the PTO generator and fuel cell. The gas-electric hybrid type ship hybrid power system with PTI-PTO adopts a plurality of energy form arrangements, realizes a plurality of working modes by opening and closing the clutches, can meet requirements of ships in various environment and working conditions, can maintain the gas engine and the motor in a high efficiency zone all the time, reduces the fuel consumption anddischarge of the gas engine, improves the power response of the ships, and enlarges seaworthiness of the ships.

The invention discloses a valve used for a diesel engine exhaust gas recirculation system, which comprises a valve seat, and a valve body and a torque motor that are arranged on the valve seat; the valve body is provided with an exhaust gas inlet and an exhaust gas outlet; the valve body is internally provided with a valve cavity; the torque motor is fixed on the valve seat; the valve also comprises an eccentric cam plate, a valve rod and a torsion spring; the eccentric cam plate and the valve rod are arranged on an output shaft of the torque motor; the axis of the valve rod is vertical to the rotation axis of the eccentric cam plate; the upper rod part of the valve rod extends into the valve cavity, and a valve block is arranged at the end part of the upper rod part; the valve cavity is divided into an upper valve cavity and a lower valve cavity by the valve block, wherein the exhaust gas inlet is respectively communicated with the exhaust gas outlet by the upper valve cavity and the lower valve cavity; the lower rod part of the valve rod extends to the eccentric cam plate and is connected with the eccentric cam plate; and the valve rod is driven to do straight line motion by the rotating movement of the eccentric cam plate. The valve is simple in structure and can adjust the ratio between air and recycled exhaust gas only by one motor.