1. Introduction
ECU (Electronic Control Unit) the electronic control unit, also known as “trip computer”, “car computer” and the like. From the use of perspective is a vehicle for computer controller, also known as vehicle-specific microcontroller. It ordinary microcontroller as large scale integration by the microprocessor (CPU), a memory (ROM ,, RAM), an input / output interface (I / O), analog to digital converter (A / D) and shaping, driving, etc. circuit.
2, and the role of the working environment
3, adaptive procedure
present in some high-class cars, not only in the application engine ECU, ECU can find traces in many other places. For example, anti-lock braking system, four-wheel drive system, electronically controlled automatic transmission, active suspension systems, air bag system, the multi-adjustable electric seat so arranged the respective ECU. With the improvement of car electronic automation, ECU will be increasing, the line will become increasingly complex. To simplify the circuit and reduce costs, the vehicle information transfer between the plurality of ECU will use a technique called multiplexing communication network, the vehicle ECU to form a network system, i.e. CAN data bus.
4, ECU upgrade
by a computer program rewrite driving, to enhance the power, increased horsepower, torque or to reduce fuel consumption, vehicle performance optimization purposes. Because modern vehicles to adapt to the weather, the environment (such as high altitude, desert, cold and poor-quality gasoline and other harsh conditions) and the different requirements of various drivers, but it is also to ensure that this complex situation still able to pass a stringent exhaust emissions, fuel consumption standards, so in most cases, the program within the original ECU is the best compromise a number of conditions. In foreign countries, ECU tuning is a service provided when buying a car. Since the case where each vehicle is different factory, together with some of the techniques employed are car specific practical requirements may not meet adjusted trip computer (ECU) so that in addition to improve the output power of the engine, acceleration, and stability, but also that the car to better adapt to the relevant sections and the environment.
5, ECU composition
ECU by the throttle position sensor, intake air temperature sensor, air flow sensor, a water temperature sensor, speed sensor, Hall sensor, knocking sensor, an oxygen sensor is mainly composed of components