Gas time-sharing gas inlet system and method based on crankshaft synchronizing signal control

By using a time-shaft intake system based on crankshaft synchronization signal control, the time separation of gas and air is achieved, solving the problems of fuel escape and backfire in four-stroke engines during the valve overlap angle stage, improving the engine's fuel utilization and emission quality, and adapting to complex operating conditions.

CN121676189APending Publication Date: 2026-03-17SHANDONG UNIV +1
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Patent Information

Application Number
CN202610136953.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-30
Publication Date
2026-03-17

AI Technical Summary

Technical Problem

Existing four-stroke engines have safety hazards such as fuel escape and backfire during the valve overlap angle stage. Current technology is unable to achieve high-precision timing control, resulting in fuel waste and non-compliance with emission standards.

Method used

The system employs a time-shaft intake system based on crankshaft synchronization signal control. The gas control valve is driven by a servo motor and operates independently of the air intake. The crankshaft synchronization signal is used to achieve time separation of gas and air, ensuring that only pure air is supplied during the high-risk period of valve overlap, thus avoiding fuel short circuits and backfire.

Benefits of technology

It completely eliminates short-circuit escape of the air-fuel mixture, improves fuel efficiency and emission quality, enhances engine safety and power, meets stringent environmental regulations, and adapts to complex operating conditions.

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Abstract

The invention discloses a gas time-sharing gas inlet method based on crankshaft synchronizing signal control, which belongs to the technical field of internal combustion engines, and comprises a gas supply channel which is arranged independent of an air inlet channel and is used for guiding gas to a cylinder, and a gas control valve is arranged on the gas supply channel; the servo motor is connected with the gas control valve and used for driving the gas control valve to execute opening or closing action; the crankshaft position sensor is used for detecting the rotating angle of an engine crankshaft in real time and generating a crankshaft synchronizing signal; and the electronic control unit is electrically connected with the crankshaft position sensor and the servo motor, receives the crankshaft synchronizing signal, judges the real-time phase of the engine according to the crankshaft synchronizing signal, and controls the servo motor to drive the gas control valve in the air inlet stroke, so that the gas control valve is kept closed in the air valve overlapping stage of the air cylinder and is opened after the air valve overlapping stage is ended. The invention aims to fundamentally solve the problems of mixed gas escape and tempering in the valve overlap angle period, and meanwhile, the economical efficiency, the dynamic property and the emission level of the engine are improved.
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