KR20220052420A - Method and apparatus for improvement of low temperature startability and prevention of oil dilution - Google Patents

Abstract

The present invention relates to a method and apparatus for preventing oil dilution and improving the ease of starting during low-temperature start-up. The method and apparatus of the present invention perform learning of injected fuel quantity to control oil dilution occurring in a low-temperature environment. The method and apparatus of the present invention prevent fuel from mixing with oil and improve start-up stability by measuring a normal start-up time with an injection counter and an engine RPM and learning an optimal start-up fuel quantity. Specifically, a learning model is built with a learning value of an injected fuel quantity for a start-up time, and an optimal fuel quantity for a startup injection is learned and stored in the learning model by increasing or decreasing the learning value of the injected fuel quantity by a predetermined fuel quantity every start-up operation. The learning value of the injected fuel quantity may be stored by outside temperature. In addition, whether to store the learning value may be determined based on the counter of an engine injector and the engine RPM.

Description

Method and apparatus for improvement of low temperature startability and prevention of oil dilution

The present invention relates to startability of a vehicle, and more particularly, to a technology for preventing oil dilution during low-temperature starting and improving startability.

Startability, that is, starting performance, is one of the important considerations when developing a vehicle, particularly, when developing an engine control. Starting means that the driver operates the engine at a standstill in order to start driving, because in order to start the car when it has been parked for several hours, it has to overcome much greater engine resistance than when it is warmed up. It requires quite a lot of power. Therefore, it is necessary to inject fuel richer than the stoichiometric air-fuel ratio during starting. When developing startability, atmospheric temperature, atmospheric pressure, fuel composition, etc. are considered.

Among these, in the case of atmospheric temperature, according to the prior art, pilot control is performed to start the engine by injecting a large amount of fuel in a state where the oxygen sensor does not operate at low temperature starting. However, at this time, an excessive amount of fuel is introduced into the cylinder, and oil dilution occurs, resulting in poor startability and impossible to start. Oil dilution refers to a phenomenon in which engine oil with no or low viscosity is mixed with other fluids (water, fuel, etc.), and the viscosity of the oil decreases and becomes thinner.

In summary, when starting a vehicle in a low temperature state, fuel is injected with a rich air-fuel ratio to improve startability. There is a problem that it becomes bad or it becomes impossible to start.

Therefore, through the present invention, it is intended to prevent oil dilution during low-temperature starting and to improve startability.

In order to solve the above problems, the present invention performs injection fuel amount learning for controlling oil dilution occurring in a low-temperature environment. By measuring the normal starting time with the injection counter and engine RPM and learning the optimal starting fuel amount, it prevents fuel mixing in the oil and improves starting stability.

More specifically, a learning model is built with the injection fuel amount learning value for the starting time, and the optimum starting injection fuel amount is learned and stored in the learning model by increasing or decreasing the fuel amount from the injection fuel amount learning value during each starting operation. . The injection fuel amount learning value may be stored according to the outside temperature. In addition, the determination of whether to store the learning value may be determined based on the injector counter of the engine and the engine RPM.

The method for improving low-temperature startability and preventing oil dilution according to the present invention performs the following process.

1. Check the condition that the coolant temperature of the vehicle is completely cooled by leaving it for more than 8 hours

2. Setting to operate only when the outside temperature is below -20℃

3. Check the crankshaft position to confirm that there is no problem with starting

4. Step of increasing the fuel amount by a predetermined set amount (e.g., 0.2%) or setting the data so that the data setter can change it

5. Step of increasing the fuel amount and applying it as a factor multiplied by the starting fuel amount

6. Checking the completion of starting the vehicle using the injection counter and engine RPM

7. Checking the startability improvement by the amount of fuel using the starting time

8. Check whether the learning value is used or not using the startup time

9. Comparing the previous cycle start time and the current cycle start time

10. Storing the learning value and the starting time when starting performance is improved due to an increase in fuel amount

11. A step of reducing the learning value and saving the starting time when starting performance is deteriorated due to an increase in fuel amount

The configuration and operation of the present invention will become clearer through specific embodiments described later in conjunction with the drawings.

According to the present invention, it is possible to obtain benefits of improving driver satisfaction by preventing an increase in the amount of fuel mixed in engine oil due to repeated short mileage at low temperatures, improving startability by learning the optimal starting fuel amount, and increasing starting stability.

1 is a software configuration diagram of a method and apparatus for improving low-temperature startability and preventing oil dilution according to a preferred embodiment of the present invention.
FIG. 2 shows hardware elements involved in the software operation of the method and apparatus for improving low-temperature startability and preventing oil dilution of FIG. 1 .
3 is a flowchart of an operation process of a method for improving low-temperature startability and preventing oil dilution according to a preferred embodiment of the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the detailed description in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only this embodiment allows the disclosure of the present invention to be complete, and those of ordinary skill in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the present invention is defined by the description of the claims. On the other hand, the terms used herein are for the purpose of describing the embodiment, not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, 'comprise' or 'comprising' refers to the presence or absence of one or more other components, steps, operations and/or elements other than the stated elements, steps, operations and/or elements. addition is not excluded.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, the same components are given the same reference numerals as much as possible even if they are shown in different drawings, and in describing the present invention, detailed descriptions of related known components or functions In the case where the gist of the present invention may be obscured, a detailed description thereof will be omitted.

A schematic configuration of a method and apparatus for improving low-temperature startability and preventing oil dilution according to a preferred embodiment of the present invention will be described. 1 is a software configuration diagram of a method and apparatus for improving low-temperature startability and preventing oil dilution, and FIG. 2 shows hardware elements involved in software operation.

In FIG. 1 , the fuel injection amount learning area 10 basically stores the fuel injection amount during starting along with the starting time, and continuously stores the calculated learning value whenever a starting operation is performed to evolve. The fuel injection amount learning value is stored together with the starting time. The form of the learning value is as follows.

- The initial value is 1, and the factor type multiplied by the amount of fuel injected at startup

- The x-axis is the outside temperature, for example, ..., -40, -30, -30, -25, -20℃.

- The y-axis is the learning value, which is stored in each array, for example, '1.×××'.

In the vehicle low temperature state checking area 20, since a lot of oil dilution occurs when the outside temperature is low, the coolant temperature is sufficiently lowered when the vehicle is completely left unattended (eg, 8 hours or more), and the outside temperature is -20 Check that it is below ℃. Learning is performed only under these temperature conditions.

The normal starting state checking area 30 confirms whether the starting state is normal because the crankshaft is in the normal position. In addition, it is checked whether the vehicle has been started by measuring the injection counter and engine RPM.

The starting time check area 40 increases the learning value (learned fuel injection amount) by 0.2% during the driver's starting operation, injects fuel, and checks the starting time required. Using this start-up time, it is checked whether the start-up performance is improved by the amount of fuel injected. And it is decided whether or not to use the corresponding injection amount as a learning value using the starting time.

And again, the fuel injection amount learning area 10 does not apply the learning value in terms of safety if the starting time ≥ 3 seconds. That is, it is determined that the starting time has become longer due to a cause other than the amount of injected fuel, and learning is stopped. And by comparing the stored starting time and the current starting time, if the starting time is shorter than the starting time of the previous cycle, it is judged that the startability is good by the corresponding fuel amount, and the injected fuel amount (learning value + 0.2%) is stored as a learning value at startup. (Stored together with the starting time), and if it is increased, it is judged that the increase in the amount of injected fuel has an adverse effect on the startability, and the reduced learning value -0.2% is saved as a learning value along with the starting time.

Although the engine 50, the injection counter 60 of the injector, the crankshaft sensor 70, and the outdoor temperature sensor 80 are representatively shown in FIG. 2 as hardware elements involved in the above software operation, in fact, only these are used. .

3 is a flowchart of an operation process of a method for improving low-temperature startability and preventing oil dilution according to a preferred embodiment of the present invention.

The process of the method of the present invention proceeds ( 110 ) when the vehicle is completely idle (eg, more than 8 hours). The completely idle state means a state in which the engine coolant is completely cooled.

It is determined whether the outside temperature (eg, measured by the outside temperature sensor 80 ) is -20°C or less ( 120 ). Since a lot of oil dilution occurs at a low outside temperature, the process and learning of this name is to proceed only in this temperature range.

By setting the crankshaft detection (eg, by the crankshaft sensor 70) to normal, it is checked whether the starting state is normal (130). This is a step to confirm that there is no problem in starting by figuring out the crankshaft position.

When the above conditions are satisfied, the fuel is injected by increasing the fuel amount by 0.2% to the existing learning value (injection fuel amount learning value) (140). Here, the fuel amount increase value of 0.2% can be arbitrarily changed by the data setter. In this step, the fuel amount is increased and applied as a factor multiplied by the starting fuel amount.

As mentioned above, the exemplary form of the learning value is '1) The initial value is 1, the factor type multiplied by the amount of injected fuel at startup, 2) the x-axis is the outside temperature, for example, ..., -40, −35, −30, −25, -20℃, 3) The y-axis is a learning value, for example, 'stored in each array as 1.×××'.

It is determined whether the normal start is completed by the RPM of the injection counter 60 and the engine 50 ( 150 ). For example, when the injection counter value < 16 and the engine speed ≥ 500 RPM, it is determined that the normal start is completed.

It is determined whether the start-up time < 3 seconds (160), and if the start-up time ≥ 3 seconds, the learning value is not applied for safety reasons (170). This is to stop learning by judging that the starting time has been prolonged due to causes other than the amount of injected fuel. As described above, the present invention uses the starting time to check the improvement of startability by the amount of fuel, and also uses the starting time to check whether the corresponding learning value is used.

By comparing the stored previous starting time and the current starting time, if the current starting time is shorter than the starting time of the previous cycle (180), it is determined that the startability has been improved by the amount of the corresponding injected fuel, and starting for the learning value + 0.2% Save the time (190). The increase value of 0.2% of this learning value (injection fuel amount) can be arbitrarily changed by the data setter. Here, 'learning value + 0.2%' means a learning value (injection amount sprayed in step 140) by adding 0.2% to the existing learning value. For example, if the existing learning value is 1.004, when startability is determined by increasing the learning value by 0.2% (fuel amount × 1.006) (step 140) (steps 160 and 180), if the startability is improved, the learning increased by 0.2% It means to store the value (1.006).

On the other hand, if the current starting time is longer than the starting time of the previous cycle, it is judged that the 0.2% increase in the injection fuel amount adversely affects the startability, and the learning value is reduced by 0.2% (learning value - 0.2%) to save the starting time. (200). Again, the fuel reduction value of 0.2% can be arbitrarily changed by the data setter.

To summarize the storage of the starting time by increasing the learning value according to the above starting time, the learning value and the starting time are stored when the starting performance is improved due to the increase in the injection fuel amount, and when the starting performance is decreased due to the increase in the injected fuel amount, the learning Decrease the value and save that start-up time.

The description of the present invention described above is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form. The scope of the present invention is determined by the claims to be described later rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents are interpreted as being included in the scope of the present invention. should be

Claims (15)

a fuel injection amount learning area in which the fuel injection amount is stored together with the starting time as a learning value at startup; and
During the driver's starting operation, the amount of injected fuel is increased by a preset amount and fuel is injected and the starting process is performed to check the starting time, and using this starting time to check whether the startability is improved by the amount of injected fuel, and this starting time including a starting time check area that determines whether to use the injection amount as a learning value using
The fuel injection amount learning area stores a corresponding fuel amount learning value and a starting time when startability is improved due to the increase in the injection fuel amount, and reduces the learning value and stores the starting time when the startability decreases due to the increase in the injection fuel amount A method for improving low-temperature startability and preventing oil dilution, which is additionally configured. The method of claim 1, wherein the fuel injection amount learning value has the following form.
- The initial value is 1, the type of factor multiplied by the amount of fuel injected at start-up,
- the x-axis is the outside temperature, and
- The y-axis is the learning value. The method of claim 1, wherein the preset amount for increasing and decreasing the learning value is 0.2% of the previous learning value. According to claim 1, wherein the fuel injection amount learning area
A method for improving low-temperature startability and preventing oil dilution, characterized in that the learning value is not applied if the starting time is longer than a preset time. 5. The method of claim 4, wherein the preset time is 3 seconds. The method of claim 1,
a vehicle low temperature state checking area for checking a state in which the vehicle is left for more than a preset time and the outside temperature is below a preset temperature; and
Low-temperature startability improvement and oil dilution, which additionally includes a normal starting state check area that checks whether the starting state is normal because the crankshaft of the engine is in the normal position, and checks whether the vehicle is started by measuring the injection counter and engine RPM How to prevent. The method of claim 6, wherein the preset vehicle leaving time is 8 hours, and the preset outside temperature is -20°C. checking a state in which the vehicle is left for more than a preset time and the outside temperature is less than or equal to a preset temperature;
Checking whether the starting state is normal by setting the crankshaft detection to normal;
injecting fuel by increasing the amount of injected fuel by a preset amount when the condition of the step is satisfied;
Determining whether the normal start is completed by the RPM of the injection counter 60 and the engine 50;
Determining whether the starting time < the preset time, and not applying the learning value if the starting time ≥ the preset time;
comparing the previous start time with the current start time and, if the current start time is shorter than the start time of the previous cycle, storing the increased injection fuel amount as a learning value together with the start time; And
When the current starting time is longer than the starting time of the previous cycle, the method for improving low-temperature startability and preventing oil dilution, comprising the step of reducing the amount of injected fuel by a preset amount and storing it as a learning value together with the starting time. The method of claim 8, wherein the preset vehicle leaving time is 8 hours, and the preset outside temperature is -20°C. The method of claim 8, wherein the preset amount for increasing and decreasing the learning value is 0.2% of the previous learning value. The method of claim 8, wherein the preset time is 3 seconds. The method of claim 8, wherein the fuel injection amount learning value has the following form.
- The initial value is 1, the type of factor multiplied by the amount of fuel injected at start-up,
- the x-axis is the outside temperature, and
- The y-axis is the learning value. a fuel injection amount learning unit that stores the fuel injection amount as a learning value at startup along with the starting time; and
During the driver's starting operation, the amount of injected fuel is increased by a preset amount and fuel is injected and the starting process is performed to check the starting time, and using this starting time to check whether the startability is improved by the amount of injected fuel, and this starting time including a starting time check unit configured to determine whether to use the injection amount as a learning value using
The fuel injection amount learning area stores the corresponding fuel amount learning value and the starting time when startability is improved due to the increase in the injection fuel amount, and reduces the learning value and stores the starting time when the startability decreases due to the increase in the injection fuel amount Additional features include improved low-temperature startability and oil dilution prevention device. The apparatus of claim 13, wherein the preset amount for increasing and decreasing the learning value is 0.2% of the previous learning value. 15. The method of claim 14,
a vehicle low temperature state checking unit configured to check a state in which the vehicle is left for more than a preset time and the outside temperature is below a preset temperature; and
Low-temperature startability improvement and oil further comprising a normal starting state confirmation area configured to confirm that the starting state is normal because the crankshaft of the engine is in the normal position, and to confirm that the vehicle has been started through the injection counter and engine RPM measurement Anti-dilution device.

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