ECM (Engine Control Module Engine Control Module) as the engine of the soul, like control of the engine running. Able to control the engine, there must be several types of sensors (Sensor) to receive and pass the engine running information, an engine intake air temperature usually sensor (IAT Sensor), throttle sensor (TPS Sensor), manifold pressure sensor (MAP Sensor), water temperature sensor (ECT Sensor), crank angle sensor (Crank Sensor), knock sensor (Knock Sensor), oxygen sensor, etc. (O2 Sensor) give the engine a variety of state information to the ECU (Engine Control Unit) for the operation of information through the operation of these engines running, it will by the ECU to the various actuators (Reactor) to issue control signals to control actuators of the actuation, engine actuators commonly have idle control valve (IAC), fuel injection module, Ignition Module, EGR valve, VVT controller, carbon canister (EEC) off valve and so on. Perhaps you the reader will see dazzling, but so many sensors and actuators so much, in fact, the most important thing is to calculate and control the engine's fuel injection and ignition timing of the best, of course, some control is to comply with environmental regulations, such as activated carbon tank valve off.

On the Ignition Module, idle speed, timing, knock control and fuel injection and other relevant units have been introduced, and fuel consumption on this to talk about "open-loop control" and "closed-loop control." In the "control study", the so-called "open loop control" means control by the control mode has been written, one-way underground command to the actuator for movement; and "closed-loop control" is added in the feedback control loop signal to correct for the momentum actuator. In the fuel injection control system, then by the ECU according to engine operating conditions, the conditions set by the amount of instructions sent to the injector fuel injection. In the open loop control, ECU fuel injection nozzle to give feedback signal command is not affected by the amendment. In the closed-loop control, the feedback signal injection instruction will be subject to the amendment, while the feedback signal to the source of the oxygen sensor. Oxygen sensor detects oxygen content of exhaust gases and the oxygen content of the signal sent to the ECU, ECU will be calculated based on the amount of oxygen and fuel injection out the actual air-fuel ratio, if the mixture is too thin to detect (empty fuel ratio), ECU will fix the directions towards the concentration of oil; if too strong to detect the gas mixture (air-fuel ratio small), ECU will fix the directions toward the light oil, so the engine is operating at optimum air-fuel ratio, when the engine's fuel consumption will be minimal.

When will the engine in the closed-loop control, and when it will be in open loop control? Under normal operating conditions in the engine are based on closed loop control, and when the throttle through the large, hard acceleration and cold state, the engine will enter the open circuit state. Especially in the Bigfoot throttle, the engine is not only in the open loop state, or even by injection into the concentration mode, so definitely more fuel. The current oil price is climbing, the best way to fuel-efficient, is to take to control their right foot!