KR-20260065618-A - A type of engine cold start flexibility control strategy

KR20260065618AKR 20260065618 AKR20260065618 AKR 20260065618AKR-20260065618-A

Abstract

The present invention relates to the field of engine cold start technology and discloses a type of engine cold start flexibility control strategy, comprising the following steps. In step S101, engine operating parameters at the current time are obtained, and a set of operating parameters is obtained by sorting them in descending order based on the influence coefficient of each operating parameter. In step S102, if it is determined that any of the operating parameters is greater than or equal to a corresponding preset parameter threshold, the process proceeds to step S103; otherwise, it returns to S101. In step S103, the engine preheating time and temperature are obtained based on the preheating time curve and preheating temperature curve corresponding to the operating parameters greater than or equal to the preset parameter threshold. In the present invention, the preheating time curve and preheating temperature curve of different engine operating parameters are obtained through a simulation experiment. Furthermore, based on the engine operating parameters at the current time, relays are linked to accurately control the engine cold start preheating time and temperature.

Inventors

황 융중
리 청
리 웨이
양 량

Assignees

광시 위차이 마린 앤 젠셋 파워 컴퍼니 리미티드

Dates

Publication Date: 20260508
Application Date: 20240923
Priority Date: 20240202

Claims (10)

As an engine cold start flexibility control strategy, A step S101 of obtaining engine operating parameters at the current time and also obtaining a set of operating parameters by sorting them in descending order based on the influence coefficient of each operating parameter, wherein the engine operating parameters include intake temperature, ambient temperature, coolant temperature, and atmospheric pressure; Step S102, which reviews all sets of operating parameters in descending order according to influence coefficients to determine whether each operating parameter is above a preset parameter threshold, and if any of the operating parameters are above the corresponding preset parameter threshold, indicates that engine warm-up has started and also enters Step S103, otherwise returns to Step S101; and Step S103 of obtaining the engine preheating time and preheating temperature based on the preheating time curve and preheating temperature curve corresponding to operating parameters above a preset parameter threshold. An engine cold start flexibility control strategy characterized by including
In paragraph 1, In the process of obtaining the influence coefficient of each operating parameter through a simulation experiment platform, Step S201, which selects one of the operating parameters as an independent variable and sets the remaining operating parameters as fixed variables, and sets the time it takes for the engine to reach the rated rotational speed and the fuel consumption value at which the engine reaches the rated rotational speed as dependent variables; Step S202, which involves randomly generating an operating parameter as an independent variable under the first constraint of each operating parameter, inputting the operating parameter as an independent variable and the remaining operating parameters as fixed variables into a simulation experiment platform, and recording the time it takes for the engine to reach the rated rotational speed and the fuel consumption value at which the engine reaches the rated rotational speed as a dependent variable; Step S202 is repeated M times, where M represents the number of simulation experiments and is also a step of obtaining the influence coefficient of the operating parameter used as an independent variable, The formula for calculating the influence coefficient of the operating parameter used as an independent variable is, And, among them, R indicates the influence coefficient of the operating parameter used as the independent variable, and M indicates the number of simulation experiments. represents the time it takes for the engine to reach rated rotational speed in the i-th simulation experiment, and the unit is s. indicates the fuel consumption value at which the engine reaches the rated rotational speed in the i-th simulation experiment, and the unit is mm. and Each represents the first weighted parameter and the second weighted parameter, and the sum of the first weighted parameter and the second weighted parameter is 1. and Step S203, wherein each indicates a first bias parameter and a second bias parameter and the sum of the first bias parameter and the second bias parameter is 1; and Step S204, which duplicates steps S201 through S203 and obtains the influence coefficients of the remaining operating parameters respectively. An engine cold start flexibility control strategy characterized by including
In paragraph 2, An engine cold start flexibility control strategy characterized by including, in the first constraint of the operating parameters, an upper and lower limit of randomly generated intake temperature, an upper and lower limit of randomly generated ambient temperature, and an upper and lower limit of randomly generated coolant temperature, each corresponding to 0℃ and a lower limit of engine operating temperature, respectively, and an upper and lower limit of randomly generated atmospheric pressure, both of which are self-defined parameters.
In paragraph 2, An engine cold start flexibility control strategy characterized by the number of simulation experiments M being a self-defined parameter and also being a positive integer greater than 1.
In paragraph 2, An engine cold start flexibility control strategy characterized in that the first weighting parameter, the second weighting parameter, the first bias parameter, and the second bias parameter are all self-defined parameters and are also real numbers greater than 0 and less than 1.
In paragraph 1, An engine cold start flexibility control strategy characterized in that the preset parameter threshold for intake temperature, the preset parameter threshold for ambient temperature, the preset parameter threshold for coolant temperature, and the preset parameter threshold for atmospheric pressure are all self-defined parameters.
In paragraph 1, In the process of acquiring the preheating time curve and preheating temperature curve associated with each operating parameter through a simulation experiment platform, Step S301 of randomly generating engine operating parameters, engine preheating time, and preheating temperature that meet the second constraint of set N; Step S302 of inputting the engine operating parameters, engine preheating time, and engine preheating temperature corresponding to the second constraint of each set, respectively, into a simulation experiment platform, and also recording the time it takes for each set of engines to reach the rated rotational speed; Step S303, which constructs four first and second tuples and four second and second tuples, respectively, based on the engine operating parameters corresponding to the minimum value of the time it takes for the engine to reach the rated rotational speed, the preheating time, and the preheating temperature, wherein the four first and second tuples are represented as {A1, B}, {A2, B}, {A3, B}, and {A4, B} respectively, and the four second and second tuples are represented as {A1, C}, {A2, C}, {A3, C}, and {A4, C} respectively, wherein A1, A2, A3, and A4 represent the intake temperature, ambient temperature, coolant temperature, and atmospheric pressure, B represents the preheating time for engine preheating, and C represents the preheating temperature for engine preheating; and Step S304, which duplicates steps S301 through S303, configures the preheating time curve for each operating parameter by fitting it using the least squares method based on the first and second tuples, and configures the preheating temperature curve for each operating parameter by fitting it using the least squares method based on the second and second tuples. An engine cold start flexibility control strategy characterized by including
In Paragraph 7, Engine cold start flexibility control strategy characterized by N being a self-defined parameter.
In paragraph 3, An engine cold start flexibility control strategy characterized in that the second constraint includes, in addition to the first constraint, that the upper and lower limits of the engine warm-up time are both self-defined parameters.
In paragraph 1, Engine cold start flexibility control strategy that controls the engine warm-up time and warm-up temperature through an electromagnetic time relay.

Description

A type of engine cold start flexibility control strategy The present invention relates to the field of engine cold start technology, and specifically to a type of engine cold start flexibility control strategy. In a cold start scenario, the low temperature of the engine slows the fuel evaporation rate and increases the viscosity of the lubricating oil, thereby increasing engine friction. This results in additional load and greater friction losses on the engine. Furthermore, the reduced combustion efficiency during a cold start leads to increased emissions, causing negative environmental impacts. The current trend in the automotive industry's technology roadmap for implementing warm-up starts is to either add external auxiliary systems or control the heating of the intake grille based on a single ambient temperature sensor. External auxiliary systems assist in engine warm-up by installing additional heating devices, such as flame injection warmers or electric heating wires, while the single ambient temperature sensor-based method implements warm-up starts by adding a pseudo-heating device to the intake grille based on a preset temperature threshold to raise the engine's intake temperature. However, if an external auxiliary system or the intake temperature sensor fails, engine preheating cannot be assisted by the additional supply of thermal energy, causing a problem where starting the engine in low-temperature environments is difficult. The present invention discloses a type of engine cold start flexibility control strategy, thereby solving the technical problems of the background technology mentioned above. The present invention discloses a type of engine cold start flexibility control strategy, which includes the following steps. In step S101, engine operating parameters at the current time are obtained, and a set of operating parameters is obtained by sorting them in descending order based on the influence coefficient of each operating parameter. The engine's operating parameters include intake temperature, ambient temperature, coolant temperature, and atmospheric pressure. In step S102, the entire set of operating parameters is reviewed in descending order according to the influence coefficient to determine whether each operating parameter is greater than or equal to a preset parameter threshold; if any of the operating parameters is greater than or equal to the corresponding preset parameter threshold, it indicates that engine warm-up has started and proceeds to step S103, otherwise it returns to step S101. In step S103, the engine preheating time and preheating temperature are obtained based on the preheating time curve and preheating temperature curve corresponding to operating parameters above a preset parameter threshold. Preferably, the process of obtaining the influence coefficient of each operating parameter through a simulation experiment platform includes the following steps. In step S201, one of the operating parameters is selected as the independent variable and the remaining operating parameters are set as fixed variables, and the time it takes for the engine to reach the rated rotational speed and the fuel consumption value at which the engine reaches the rated rotational speed are set as dependent variables. In step S202, an operating parameter to be used as an independent variable is randomly generated under the first constraint of each operating parameter, and the operating parameter to be used as an independent variable and the remaining operating parameters to be used as fixed variables are input into a simulation experiment platform, and the time it takes for the engine to reach the rated rotational speed and the fuel consumption value at which the engine reaches the rated rotational speed, which are the dependent variables, are recorded. In step S203, step S202 is repeated M times, where M represents the number of simulation experiments, and the influence coefficient of the operating parameter used as the independent variable is also obtained. The formula for calculating the influence coefficient of the operating parameter used as an independent variable is as follows. , among them, R indicates the influence coefficient of the operating parameter used as the independent variable, and M indicates the number of simulation experiments. represents the time it takes for the engine to reach rated rotational speed in the i-th simulation experiment, and the unit is s. indicates the fuel consumption value at which the engine reaches the rated rotational speed in the i-th simulation experiment, and the unit is mm. and Each represents the first weighted parameter and the second weighted parameter, and the sum of the first weighted parameter and the second weighted parameter is 1. and Each represents the first bias parameter and the second bias parameter, and the sum of the first bias parameter and the second bias parameter is 1. In step S204, steps S201 through S203 are duplicated, and the infl