What are the technical routes of methanol vehicles?

1. Gasoline/methanol (M 100) combustion technology represented by Geely Automobile.

The engine adopts gasoline and methanol fuel supply system. Start with gasoline to ensure normal start at normal temperature and low temperature. After stable operation, it will automatically switch to stable operation of methanol fuel. The electronic control system can automatically identify the driving state of the vehicle, and can smoothly switch between the two fuels, so that the engine can run smoothly. This method solves the problem of difficult cold start of methanol vehicle at low temperature.

The second is the methanol (M85) combustion technology represented by FAW Technology.

The engine adopts a single fuel supply system, which needs to be adapted to the engine. Spark plugs suitable for methanol combustion, large-flow alcohol-proof fuel nozzles, brushless motor alcohol-proof pumps and special lubricants for methanol engines are adopted. By improving the combustion system, fuel modification, intake heating, fuel heating and optimizing the control strategy, the cold start problem is solved, and a heating device is added to the engine intake port to increase the intake temperature. The injector with heating function is used for mixing combustion and heating the former fuel; Install the imported reversing valve to increase the reflux ratio and promote the full mixing of fuel and air; Increasing the compression ratio of the engine can effectively increase the in-cylinder temperature and improve the ignition performance of the mixture; Optimize the control strategy to determine the optimal fuel injection quantity and ignition advance angle; Adding 15% gasoline to methanol, and adding additives such as petroleum ether, isopentane and C4-C8 light fraction alkanes to improve the low-temperature volatility of fuel can greatly increase the high methanol concentration of the mixed gas.

Three, Tianjin University diesel/methanol (M 100) combined combustion technology

Methanol itself is not easy to be compressed, so when diesel engine uses methanol fuel, it needs to be started together with diesel. When the engine temperature meets the design requirements, methanol is injected through the air inlet, diesel is ignited, and diesel/methanol binary fuel is mixed and burned in the diesel engine. The methanol injection time and methanol quantity are automatically controlled by the electronic control system, and the two systems work together. The methanol substitution rate of diesel/methanol mixed combustion technology is 35% ~ 45%, which can greatly improve fuel economy. The power of the engine is the same as that of the original engine, and the acceleration performance even exceeds that of the original engine. After methanol mixed combustion, the emission level is greatly improved, and low-carbon, clean and smokeless emissions can be realized.