A fuel supply control method for a vehicle electronically controlled methanol-diesel dual-fuel engine
A dual-fuel engine and control method technology, applied in engine control, fuel injection control, electrical control, etc., can solve problems such as difficult to measure, difficult to measure directly, and achieve the effects of extending engine life, reducing operating costs, and running smoothly
Inactive Publication Date: 2017-11-14
CHANGAN UNIV
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Problems solved by technology
[0005] Since it is difficult to directly measure the temperature in the engine cylinder, and it is also difficult to achieve a quick and simple measurement of the mixture concentration of the premixed fuel outside the cylinder, it is necessary to consider seeking some easy-to-measure methods related to the temperature in the cylinder and the concentration of the mixture gas. , a parameter strongly correlated with the maximum substitution rate
At present, domestic patents related to electronically controlled dual-fuel engines for vehicles mainly focus on hardware technologies such as injectors and fuel supply devices and the overall design of electronic control systems. There are no related patents that are identical or similar to this patent and involve specific fuel supply strategies.
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[0020] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0021] According to the test, the applicant found that the two parameters of engine intake pressure and exhaust temperature significantly affect the methanol-diesel substitution rate when the engine knocks, in other words, the boundaries of the methanol-diesel substitution rate can be determined through these two parameters. Therefore, the applicant finally decided to use the two parameters of engine exhaust temperature and intake pressure to determine whether knocking would occur in a methanol-diesel dual-fuel engine under a certain substitution ratio of methanol to diesel. Finally, a series of effective substitution rate boundaries are formed by using the exhaust temperature and intake pressure, so as to prevent the engine from knocking due to an excessively high substitution rate and cause adverse effects on its operation.
[0022] Based on the abo...
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The invention discloses a fuel supply control method of an electric control methanol-diesel dual-fuel engine for a vehicle. The methanol-diesel substitution rate is dynamically determined according to the exhaust temperature and intake pressure of the engine, and therefore different methanol-diesel injection amount proportions can be determined according to different conditions of the engine. By means of the fuel supply control method, the knocking phenomenon can be avoided as far as possible on the premise of guaranteeing the maximum substitution rate, and the effects of increasing the use economy of the methanol-diesel dual-fuel engine and prolonging the service life of the methanol-diesel dual-fuel engine can be achieved.
Description
technical field [0001] The invention belongs to the application field of alternative fuels for vehicle engines, and in particular relates to a dynamic fuel supply strategy for vehicle dual-fuel engines. Background technique [0002] Due to the large soot emission of diesel engines, it has caused serious harm to the atmospheric environment. At present, an economical and effective solution is to transform diesel engines into dual-fuel engines. The dual-fuel engine operates by coupling two fuels with different activities. The low-activity fuel (methanol) enters the cylinder in a pre-mixed form. The low-activity fuel can effectively reduce the soot emission of the engine, and generally the price of the low-activity fuel (methanol) is lower than that of the high-activity fuel (diesel), so this combustion method can effectively reduce the diesel engine while reducing smoke exhaust. operating costs, so it has a strong potential for promotion and application. [0003] At present, ...
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IPC IPC(8): F02D19/08F02D41/00
CPCF02D19/0655F02D19/081F02D41/0025F02D2200/0406F02D2250/00
Inventor 李阳阳张春化陈昊马志义林广宇
Owner CHANGAN UNIV