A cooling control method for a gasoline engine for a vehicle
A technology for cooling control and vehicle gasoline, which is applied in engine cooling, coolant flow control, engine components, etc., and can solve the problems of coolant flow and crankshaft power waste, increased engine friction, and low exhaust gas temperature. Effects of improved fuel efficiency, improved emission levels, increased exhaust gas temperature
Active Publication Date: 2019-05-03
CHONGQING CHANGAN AUTOMOBILE CO LTD
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Problems solved by technology
[0005] Therefore, when the engine is under low-load and low-temperature conditions, it naturally forms a significant waste of coolant flow and crankshaft power, which leads to low engine temperature, increased engine friction, poor combustion, and low exhaust gas temperature. Fuel efficiency and emission levels deteriorate, especially when the ambient temperature is low
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0022] For automotive gasoline engines, the mixing ratio of fuel and air must be kept within a certain range to ensure good fuel combustion, and the heat release of fuel combustion is almost linearly positively correlated with the intake mass flow rate of the engine. Therefore, the vehicle gasoline engine control system needs to measure or calculate the intake air mass flow of the engine to ensure that the fuel supply can make the engine work normally and meet the driver's operating requirements. Most of the heating of engine coolant comes from the combustion of fuel. Therefore, the intake air mass flow data calculated by the existing software of the vehicle gasoline engine control system can be used to estimate the heating of the engine coolant.
[0023] This solution does not directly control the operation of the clutch water pump based on the temper...
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The invention relates to a cooling control method for a vehicle gasoline engine. The cooling control method comprises the steps that the voltage of an engine electronic controller, the rotation speed of an engine, the failure state of a coolant temperature sensor and the failure state of a clutch type water pump are detected; whether the clutch water pump is allowed to work or not under the detected information condition is judged; the intake air mass flow rate W<intake>, and the coolant temperature correction factor T of the difference value between the current temperature and the target temperature of a coolant are obtained, and the heat integral coefficient K is calculated according to the formula that K=W<intake>*T; whether the heat integral coefficient K is larger than the first preset value or not is judged; the heat integral coefficient K is subjected to time integral to obtain the coolant heat integral value S; whether the coolant heat integral value S is larger than the second preset value or not is judged, and if yes, the clutch type water pump operates for t<SWP> and then stops operating; and if not, the clutch type water pump stops operating immediately. According to the scheme, the purposes of improving the fuel efficiency of the vehicle gasoline engine and lowering the emission level are achieved.
Description
technical field [0001] The invention relates to the field of electronic control of internal combustion engines for automobiles, in particular to a cooling control method for gasoline engines for automobiles. Background technique [0002] At present, the cooling system of gasoline engines for vehicles is generally forced liquid cooling, and the cooling water pump drives the cooling liquid to circulate in the cooling circuit of the engine to ensure that the engine works at a suitable temperature. [0003] The crankshaft of the engine transmits torque and speed to the cooling water pump through the belt to make the cooling water pump run. With the gradual improvement of the degree of strengthening of gasoline engines for vehicles, the calorific value during operation also increases. Therefore, the design of its cooling system is also continuously optimized to meet its huge cooling demand during high-load operation. One of the important means is to increase the head and flow o...
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IPC IPC(8): F01P7/14
CPCF01P7/14F01P2050/22
Inventor 侯思晨张才干詹樟松张青
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD