Diesel-alternative fuel hybrid combustion engine control method

Abstract

The invention provides a diesel-alternative fuel hybrid combustion engine control method without an electric oil pump rack actuating mechanism, belonging to the field of engine control. According to the invention, an exhaust temperature sensor, a wide-range oxygen sensor, a mixedly burning ratio information display screen, an alternative fuel injection controller, a high pressure diesel pump rack displacement sensor and an alternative fuel injector are additionally arranged on an original diesel engine with a mechanical high pressure fuel pump; a high pressure diesel pump rack is mechanically connected with a vehicle accelerator pedal; and according to the position of the high pressure oil pump rack of the diesel engine, the alternative fuel injection controller determines the injection quantity of alternative fuel in combination with estimation on the excess air coefficient of an engine and the operation intention of the driver and sends a control command to drive an alternative fuel injection valve to inject corresponding alternative fuel to an engine intake pipe. The method has the beneficial effects of lowering the cost and overcoming the adverse factors caused by the adoption of an electric oil pump rack actuator and can be widely applied to the diesel-alternative fuel hybrid combustion engines.

Description

technical field [0001] The invention belongs to the field of engine control, and is especially suitable for the engine control of diesel-alternative fuel mixed combustion. Background technique [0002] In today's world of high fuel prices, people are constantly looking for ways to use alternative fuels in existing engines. Especially for high-power commercial diesel vehicles or construction machinery, the industry seeks to adopt the diesel-alternative fuel mixed combustion mode without changing the basic structure of the engine, and reduce the engine's demand for diesel by partially adding alternative fuels. Alternative fuels currently available include gas / liquid natural gas, alcohols, dimethyl ether, etc. [0003] In the existing technical solutions, for diesel engines with mechanically controlled high-pressure fuel pumps, an electronically controlled fuel pump rack actuator must be added to control the blending ratio of diesel and alternative fuels when converted to a du...

AI Technical Summary

Problems solved by technology

However, in actual use, the installation of electronically controlled rack actuators has problems of consistency and changes in the blending ratio after mechanical wear, especially for the aftermarket (refitting commercial vehicles), and there is even more difficulty in calibration

At the same time, the cost of installing an electronically controlled oil pump rack actuator is also relatively high, which is not conducive to market promotion

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