Automobile speed control method for electronic fuel injection automobile

Abstract

The invention discloses an automobile speed control method for an electronic fuel injection automobile, which can calculate automobile accelerated speed based on automobile speed signals, achieve current objective automobile speed according to current work condition, obtain a differential value by using the current automobile speed to subtract the current objective automobile speed, and calculate a special fuel injection mode threshold value according to current automobile acceleration speed. When the differential value is larger than or equal to the special fuel injection mode threshold value and the differential value is minus, number of times of continuous fuel injection sequence in fuel injection fuel cut sequence of each cylinder increases with enlargement of the absolute value of the differential value, and the continuous fuel injection sequence is separated by one fuel cut. When the differential value is zero, the fuel injection fuel cut sequence of each cylinder is in normal fuel injection mode. When the differential value is positive, number of times of continuous fuel cut sequence in fuel injection fuel cut sequence of each cylinder increases with enlargement of the differential value, and the continuous fuel cut sequence is separated by one fuel injection. The automobile speed control method for the electronic fuel injection automobile can effectively limit automobile of the electronic fuel injection automobile with a single cylinder engine or a multiple cylinder engine, and the automobile speed is small in fluctuation.

Description

technical field [0001] The invention relates to engine technology, in particular to a method for controlling vehicle speed of an electronic injection vehicle. Background technique [0002] EFI vehicles use multi-point injection electronic fuel injection control system on the engine. The electronic fuel injection control system takes an engine control unit (ECU) as the control center, and uses various sensors installed on different parts of the engine to measure the Various working parameters, according to the control program set in the engine control unit (ECU), control the fuel injection quantity by controlling the injector, the control method is flexible, and can realize the precise control of the engine air-fuel ratio, so that the engine can operate under various working conditions Can get the best concentration of the mixture. [0003] The speed limit is an important guarantee for vehicle safety, and there are different requirements in different countries and applicatio...

AI Technical Summary

Problems solved by technology

[0004] The common method of limiting vehicle speed is to increase the mechanical device to limit the opening of the throttle body valve plate, thereby limiting the engine power, but this method cannot be used when the vehicle is in different gears or when there are different needs according to the working conditions. To limit the speed of different needs, it is generally limited to meet the power limit requirements; the other is to detect the signal of the vehicle speed sensor. When the vehicle speed reaches the target speed limit, the electronic fuel injection control system controls one of them respectively according to the limit value exceeded by the vehicle speed. or multiple cylinders cut off, when the vehicle speed drops below the target speed, the fuel supply to each cylinder is resumed, so as to achieve the purpose of limiting the vehicle speed, but this method of cutting off the fuel cannot precisely control the fuel supply of a specific cylinder, and the single cylinder As far as the engine is concerned, oil cut-off means that all power is cut off, and all power is restored when it is restored, which will lead to discontinuous power output and large fluctuations in vehicle speed, which cannot meet the drivability requirements of vehicle speed control.

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