Diesel oil ignition methanol dual-fuel engine exhaust reforming and combustion system and control method

By catalytically reforming unburned methanol and adjusting the reformed gas injection rate in real time, the problem of the reformed gas not being able to flexibly promote methanol combustion was solved, achieving stable combustion and pollutant control in high-proportion methanol diesel engines, and improving engine operating efficiency and stability.

CN122040435APending Publication Date: 2026-05-15TONGJI UNIV
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Patent Information

Application Number
CN202610202219.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-12
Publication Date
2026-05-15

AI Technical Summary

Technical Problem

Existing technologies cannot effectively promote methanol combustion with reformed gas, resulting in complex operating conditions and unstable engine cycles in high-proportion methanol diesel engines. Furthermore, these engines lose their ignition effect or even inhibit combustion when the hydrogen-to-methanol ratio is unbalanced.

Method used

An exhaust gas reforming device is used to catalytically reform unburned methanol. Reformed gas is introduced into the gas storage tank through a reformed gas circulation branch flow regulating valve. The reformed gas is then controlled in conjunction with the reformed gas intake port injection and the common rail direct injection system. Combined with cylinder pressure sensor and sensor feedback, the amount and ratio of reformed gas injection are adjusted in real time to ensure stable combustion.

Benefits of technology

It improves the utilization rate of reformed gas, achieves efficient and stable combustion of methanol and synergistic control of pollutants, solves the problem of difficult ignition of methanol under low temperature and low speed conditions, and ensures stable operation of the engine under different operating conditions.

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Abstract

The invention relates to an exhaust reforming and combustion system of a diesel ignition methanol dual-fuel engine and a control method. The system comprises an exhaust reforming device, a combustion device and a diesel ignition methanol dual-fuel engine, wherein the exhaust reforming device is used for carrying out catalytic reforming on unburned methanol in exhaust; a reformed gas circulation branch flow regulating valve; the gas cylinder is connected with the valve; the reforming gas inlet channel injection common rail and the reforming cylinder internal direct injection common rail are respectively connected with the gas storage cylinder; the reformed gas inlet channel nozzle is connected with the gas inlet channel common rail; the in-cylinder direct injection gas auxiliary nozzle is simultaneously connected with the methanol in-cylinder direct injection common rail and the reformed gas direct injection common rail; a cylinder pressure sensor for monitoring a cylinder pressure; the first methanol and hydrogen sensor is used for monitoring reformed gas components; and an ECU. Compared with the prior art, stable control over the hydrogen-alcohol ratio of the reformed gas and intelligent optimization of the in-cylinder combustion state can be achieved, and the problem that high-ratio methanol combustion is unstable is solved.
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