Multi-stage injection methanol engine cold start device and method

Abstract

The invention belongs to the field of methanol engine cold start, and discloses a multi-stage injection methanol engine cold start device and method. The device comprises a methanol evaporation and cracking module and a methanol multi-stage injection and ignition module, the methanol evaporation and cracking module comprises a first air inlet passage, a combustion chamber, an evaporation and cracking chamber and an exhaust pipe which are sequentially connected, and the methanol multi-stage injection and ignition module comprises a methanol box, a methanol high-pressure oil rail, a methanol pump, a first-stage methanol injector, a second-stage methanol injector, a sparking plug and a controller. The invention further discloses a multi-stage injection methanol engine cold start method. Methanol cracking gas can be prepared under the condition of low ambient temperature by multi-stage methanol injection and single ignition under the condition of cold start, and the methanol cracking gas and the uncracked methanol gas are introduced into an engine together to realize rapid cold start of the pure methanol engine. The device has the advantages of being high in stability, low in electricity consumption and easy to produce in an industrialized mode.

Description

technical field [0001] The invention belongs to the technical field of methanol engine cold start, and more specifically relates to a multi-stage injection methanol engine cold start device and method. Background technique [0002] Due to the large latent heat of vaporization of methanol, it is difficult to evaporate and form a flammable mixture with air in a low temperature environment, resulting in difficult cold start. The existing technical means to solve the cold start of methanol engine mainly include: installing a preheating device. The preheating device includes an intake pipe preheating device, a first intake port preheating device, an oil rail preheating device and an injector preheating device. The air heated by the intake pipe is relatively far away from the cylinder, so it cannot directly act on the initial cycle of cold start, and there is a lot of heat loss along the way, so the heating effect is not good. The preheating of the first air intake is by install...

AI Technical Summary

Problems solved by technology

The above existing technologies provide heat for methanol cracking through electric heating. Electric heating takes a long time to provide heat, and the energy density is not high. It is also necessary to provide special heating parts.

Images