Variable compression ratio opposed piston homogeneous charge compression ignition engine

Abstract

The invention provides a variable compression ratio opposed piston homogeneous charge compression ignition engine. The engine is characterized in that two pistons are arranged relatively in a cylinder, a main crank shaft and an auxiliary crank shaft are arranged on the two sides of the cylinder, each crank shaft is connected with a respective piston through a connecting rod, the auxiliary crank shaft is connected with a phase crank shaft through an angle turning device, the phase crank shaft is connected with the main crank shaft through a phase connecting rod, rotating speed of the main crank shaft is equal to that of the auxiliary crank shaft, rotating direction of the main crank shaft is equal to that of the auxiliary crank shaft, and turn angle of the angle turning device is adjusted through two oil cylinders in the angle turning device so that the phase crank shaft has an angle of advance relative to the auxiliary crank shaft, the phase crank shaft pushes the main crank shaft to rotate an angle of advance through the phase connecting rod, and eventually the main crank shaft has an angle of advance relative to the auxiliary crank shaft, namely, a main and auxiliary crank shaft phase angle, compression ratio of the engine can be changed by adjusting the phase angle of the main crank shaft and the auxiliary crank shaft, and the engine can work by adopting a homogeneous charge compression ignition manner in the whole process by adjusting the compression ratio of the engine.

Description

technical field [0001] The invention is a variable compression ratio opposed piston homogeneous compression ignition engine, which is characterized in that two pistons are relatively arranged in a cylinder, the main and auxiliary crankshafts are arranged on both sides of the cylinder and connected with their respective pistons through connecting rods, and the auxiliary crankshaft The phase crankshaft is connected with the phase crankshaft through the angler, and the phase crankshaft is connected with the main crankshaft through the phase connecting rod. The auxiliary crankshaft has an advance angle, and the phase crankshaft pushes the main crankshaft to rotate an advance angle through the phase connecting rod. Finally, the main crankshaft has an advance angle than the auxiliary crankshaft, that is, the phase angle of the main and auxiliary crankshafts. By adjusting the phase angle of the main and auxiliary crankshafts, the Changing the compression ratio of the engine can make ...

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Problems solved by technology

[0002] The concept of homogeneous compression ignition engine (referred to as HCCI engine) has been proposed for decades. It absorbs the common advantages of gasoline engines and diesel engines, adopts high compression ratio compression ignition, and has no throttle valve to form a homogeneous mixture in the cylinder. , no spark plug, direct compression ignition of air mixture with high compression ratio, its advantages are no obvious flame propagation, fast combustion speed, thus high thermal efficiency, reduced nitrogen oxides and solid particle emissions, and thus received extensive attention from all over the world, But its disadvantages are also obvious. The range of HCCI working conditions is relatively narrow, the power load is low, knocking is easy to occur when the load is high, and the engine is easy to misfire when the load is low. To solve this problem, major international automobile companies such as GM adopt the method of controlling the combustion process. To solve the problem, direct injection, variable timing, intelligent fuel control and exhaust gas recirculation are used to control the combustion process of the HCCI engine, which obviously widens the range of HCCI operating conditions, but it still needs to be used at high and low loads. With the traditional spark plug ignition method, the biggest challenge of the HCCI engine is to precisely control the combustion process. The control system is extremely complicated, which increases the cost of the engine, so this engine has not been mass-produced so far.

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