What is the difference between open loop and closed loop in a car engine?
The difference between open-loop control and closed-loop control: 1. Open-loop control: There is only sequential action between the controller and the controlled object without reverse contact, and the control is performed in one direction. If the component characteristics and parameter values that make up the system are relatively stable and the external interference is small, open-loop control can maintain a certain degree of accuracy.
Disadvantages: The accuracy is usually low and there is no automatic correction capability. 2. Closed-loop control: A closed-loop control system has a feedback loop between the output end and the input end, and the output quantity has a direct impact on the control process.
The open-loop control system refers to a system in which the car engine can only control the fuel injection volume based on preset data, but cannot control the fuel volume based on changes in actual conditions. Generally, there are carburetor cars. , EFI gasoline vehicles and ordinary diesel vehicles without three-way purifier and maintenance sensor.
The closed-loop control system refers to a system in which the automobile engine can control the amount of fuel injection based on the oxygen content data in the exhaust emissions through an oxygen sensor. There are most electronic injection gasoline vehicles and some high-end electronic injection diesel vehicles currently sold on the market.
To put it more bluntly, generally EFI gasoline vehicles with three-way purifiers and maintenance sensors are EFI vehicles with a closed-loop control system, but not necessarily vice versa.
The design improvement from the carburetor to the open-loop EFI control system to the closed-loop control system aims to save energy and protect the environment. Only a closed-loop control system EFI vehicle with a three-way purifier and maintenance sensor can meet international environmental protection vehicle inspection standards.
At present, automobile manufacturers have stopped the production of open-loop control system vehicles, and many cities such as Beijing and Shanghai have also not allowed open-loop control system vehicles on the road because incomplete combustion of fuel will cause atmospheric pollution.
In terms of production costs, the cost of closed-loop control system vehicles is more than 5% higher than that of open-loop control system vehicles.
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