A cold start control method for a dual-fuel engine
A dual-fuel engine, cold start technology, applied in the direction of engine control, machine/engine, mechanical equipment, etc., can solve problems such as easy fire, and achieve the effects of avoiding fire, increasing inertia, and increasing temperature
Active Publication Date: 2019-01-29
GREAT WALL MOTOR CO LTD
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Problems solved by technology
[0004] In view of this, the present invention aims to propose a dual-fuel engine cold start control method to solve the problem that the cold start dual-fuel engine is prone to misfire in the first few cycles
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Embodiment Construction
[0030] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0031] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0032] see figure 1 , an embodiment of the present invention provides a dual-fuel engine cold start control method, comprising the following steps:
[0033] Step S1:
[0034] According to the current coolant temperature in the dual-fuel engine, the cold start speed corresponding to the current coolant temperature is obtained; wherein, the cold start speed corresponding to the current coolant temperature is higher than the speed corresponding to the cold start diesel engine at the current coolant temperature ;
[0035] Step S2: According to the cold start speed corresponding to the current coolant temperature, cold start the dual-fuel engine until the vehicle is in an idling state;
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The invention provides a dual-fuel engine coldstarting control method, relates to the engine technical field, and aims to solve the easy firing problems in first several cycles of coldstarting; the method comprises the following steps: obtaining a coldstarting rotate speed according to the present coolant temperature; coldstarting the dual-fuel engine according to the coldstarting rotate speed until the vehicle is in an idle running state. The method uses the coolant temperature to determine the coldstarting rotate speed, and the obtained coldstarting rotate speed is higher than a coldstarting diesel oil engine rotate speed; when the dual-fuel engine is coldstarted according to the determined coldstarting rotate speed, the dual-fuel engine crankshaft and rotation system inertia can be increased, thus fast increasing diesel oil cylinder inner temperature, preventing firing formation, allowing the vehicle to finish coldstarting and enter the idle running state, and reducing dual-fuel engine total hydrocarbon discharge capacity; the dual-fuel engine coldstarting control method is applied to the dual-fuel engine coldstarting process.
Description
technical field [0001] The invention relates to the technical field of engines, in particular to a method for controlling cold start of a dual-fuel engine. Background technique [0002] The common engine is a gasoline engine fueled by gasoline, or a diesel engine fueled by diesel oil, but this engine consumes a lot of fuel and has high emissions of nitrogen oxides and soot; for this reason, a dual-fuel engine has been designed , which uses gasoline and diesel as mixed fuel to drive the car to run, wherein gasoline enters the diesel cylinder through the intake port, and diesel is injected into the diesel cylinder through the nozzle on the diesel cylinder, so that the diesel and gasoline are mixed and compressed to ignite the piston. acting. Compared with traditional diesel engines, although dual-fuel engines have low fuel consumption and low emissions of nitrogen oxides and soot, their total hydrocarbon emissions are about ten times higher than those of traditional diesel en...
Claims
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IPC IPC(8): F02D19/08F02D17/04
Inventor 崔亚彬高定伟赖海鹏
Owner GREAT WALL MOTOR CO LTD