We have learned that the engine control system is simple and is composed of three parts , namely, sensors Sensor, the central control unit (ECU) and actuators , in theory, as long as these three systems are working properly , the engine can operate normally ( other hardware normal state ) , the normal work of the internal combustion engine is only the minimum required . Performance aside part of engine displacement , parts strength , precision, intake and exhaust systems , ignition , fuel system, cooling system, do not say, alone ECU programmed , the original vehicle ECU program set take into consideration the performance of the vehicle emissions , fuel economy , durability and other issues, even taking into account whether for urban roads ( power output characteristics , emphasizing the low torque output ) .(turbo chra cartridge)
Original computer according to different load and engine speed , set one of the most stable injection and ignition parameters , so that the combustion temperature is neither too high nor make the mixture too thick or too thin, taking into account the different regions of the fuel quality difference ( ignition timing control conservative ) . But since it is widely used , then this setting must be more conservative . By changing the ECU program to more precise control of fuel injection, ignition timing , etc. can enhance the combustion efficiency or power performance of the engine. Also, or both.(turbo chra)
We must first understand the principle of the internal combustion engine through fuel combustion , explosion and generate power , then the ratio between fuel and air is very important. Lean fuel mixture ( air-fuel ratio is greater than 14.7 ) can be fuel-efficient , rich mixture ( air-fuel ratio of less than 14.7 ) can provide greater impetus. Of course , the so-called concentrated or dilute , will ensure that the engine is under normal operating conditions, the mixing ratio is too low or too high , can not get a good condition , the different operating conditions of the engine air-fuel ratio adjustment will have different, everything depends on the specific circumstances.(renault connecting rods)
Take an example air-fuel ratio , will not change the properties of a simple modification to an aspect often requires other components with changes, such as the oil system, but often because then increase horsepower , and to reduce the knocking and better distributing the engine Why the heat will be transferred after multiple fuel injection quantity, so to improve the dynamic performance involving not often tend to be more expensive oil before conversion , and enhance dynamic performance appears even smoky flame phenomenon it is not difficult to understand.
