KR100428178B1 - a method for fuel injection and fuel quantity controlling of engine - Google Patents

Abstract

To determine whether water is present in the intake pipe when the engine coolant temperature is higher than the set temperature, and to prevent damage in the combustion chamber;

Determining whether water is present in the intake pipe when the coolant temperature in the engine start-up state is equal to or greater than a predetermined set reference value and the various sensors are normal; Counting the water survival time from the time when the output value of the water detection sensor is output above a predetermined failure determination reference value, when it is determined that water is present in the intake pipe; Judging that the bite existence time is counted more than a predetermined set warning reference set value in the step; If it is determined in the above step that the water dwell time is counted over a predetermined set warning reference set value, the step of outputting a warning lamp lighting signal, and controlling the fuel amount and fuel injection timing, thereby improving the durability performance of the engine. In addition, it is possible to increase the maintenance efficiency by shortening the time for identifying the cause of the re-occurrence when a problem occurs in the liner or the like.

Description

{A method for fuel injection and fuel quantity controlling of engine}

The present invention relates to an engine fuel injection timing and a fuel amount control method, and more specifically, to recognize the water sucked into the intake pipe, the engine fuel injection timing that can prevent damage to the cylinder due to the oil film formed in the combustion chamber And a fuel amount control method.

In general, an engine is a device that burns a mixture of fuel and air and converts thermal energy generated at this time into mechanical energy.

Therefore, the formation and combustion process of the fuel-air mixture in the engine is very important. In order for combustion to occur, air and fuel need to be uniformly mixed in the flammable limits.

That is, even if there is too much fuel or air, combustion does not occur smoothly, and an appropriate mixing ratio must be maintained.

There are two methods for mixing fuel and air in an engine using a carburetor and a method for injecting fuel.

Fuel injection is to directly or indirectly measure the amount of air sucked into the engine, and to measure and inject the amount of fuel so as to have an air-fuel ratio set appropriately for the load and the rotational state of the engine. The microcomputer calculates and judges from the input data to determine the final fuel injection quantity and sends a valve open signal to the injector through the output circuit. The injector opens the valve and supplies the fuel pressurized at a constant pressure to the engine for the injection time corresponding to the injection amount.

When water is formed in the intake pipe due to the inflow of wet air in the process of inhaling the air in the engine operating as described above, the oil film in the combustion chamber is destroyed so that liner scuffing occurs in the cylinder. There is a problem.

In addition, when a vehicle is parked for a long time, rust is generated by water in the intake pipe, which causes a problem that adversely affects a piston or a valve when the vehicle is sucked into the combustion chamber.

Accordingly, an object of the present invention is to solve the above problems, the amount of fuel and the injection timing to determine whether the water in the intake pipe in the intake pipe when the engine coolant temperature is higher than the set temperature to prevent the damage in the combustion chamber in advance To provide an engine fuel injection timing and fuel amount control method that can control the.

The present invention for achieving the above object,

Determining whether water in the intake pipe persists when the coolant temperature in the engine start-up state is equal to or greater than a predetermined set reference value and the various sensors are normal;

Counting the water survival time from the time when the output value of the water detection sensor is output above a predetermined failure determination reference value, when it is determined that water is present in the intake pipe;

Judging that the bite survival time is greater than a predetermined set warning reference set value in the step;

If it is determined in the above step that the water survival time is counted more than a predetermined set warning reference set value, it is characterized in that it comprises the step of outputting a warning lamp lighting signal, and controlling the fuel amount and fuel injection timing.

1 is a block diagram of the engine fuel injection timing and fuel amount control device according to the present invention,

2 is an operation flowchart of an engine fuel injection timing and a fuel amount control method applied to the present invention;

3 is a flowchart illustrating the operation of the subroutine of FIG.

4 is a graph of the water sensor operation according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100: vehicle operation state detection device 110: engine speed detection unit

120: cooling water temperature detection unit 130: vehicle speed detection unit

140: TDC detector 150: water detector

160: intake air temperature detection unit 170: injector state detection unit

200: engine control device 300: drive device

310: first driving unit 320: second driving unit

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a configuration of an engine fuel injection timing and a fuel amount control apparatus according to the present invention, and the vehicle operation state detection device 100 detects a signal that is variable according to a change in an operation state of a vehicle.

The engine control apparatus 200 receives a signal output from the vehicle operation state detecting apparatus 100, and when the coolant temperature is equal to or greater than a predetermined reference value in the engine starting state and various sensors are normal, water is present in the intake pipe. If it is determined that the output value of the water detection sensor outputs more than a predetermined failure determination reference value, the water dwell time is counted, and when the counted water dwell time exceeds the predetermined set warning reference set value, the warning lamp light signal Output, and control the fuel amount and fuel injection timing.

The driving device 300 turns on and off the warning lamp in synchronization with the fuel supply cutoff control signal output from the engine control device 200, and adjusts the amount of fuel injected and the injection timing of the engine.

The vehicle operation state detection apparatus 100 includes an engine rotation speed detection unit 110 for detecting an engine speed that varies according to a change in the vehicle operation state;

A cooling water temperature detector 120 which detects a cooling water temperature that varies according to a change in an operation state of the vehicle;

A vehicle speed detector 130 for detecting a vehicle speed change that is changed according to a vehicle operation state change;

A TDC detection unit 140 for detecting a top dead center of cylinder 1 that varies according to a change in a vehicle operating state;

A water detection unit (150) provided at a predetermined position of the intake pipe to detect whether water is present in the intake pipe;

An intake air temperature detector 160 detecting a temperature of the air sucked in response to a change in a vehicle operating state;

It is provided with an injector detector 170 for detecting whether the injector failure is variable according to the change of the vehicle operating state.

An engine fuel injection timing and a fuel amount control method having the above configuration will be described with reference to FIGS. 2, 3, and 4.

When power is applied to the vehicle, the engine control apparatus 200 initializes all the variables used (S100).

The vehicle operating state detecting apparatus 100 detects an engine speed, a cooling water temperature, a vehicle speed, a TDC, a water, an intake temperature, and an injector state that vary according to the vehicle operating state.

Accordingly, when the engine control device 200 outputs a predetermined control signal to the vehicle operation state detection device 100, the vehicle operation state detection device 100 outputs a predetermined control signal output from the engine control device 200. Engine speed, cooling water temperature, vehicle speed, TDC, water, intake temperature, and injector state detected in synchronization with each other.

The engine control apparatus 200 receives the engine speed, the cooling water temperature, the vehicle speed, the TDC, the water, the intake temperature, and the injector state output from the vehicle operation state detection apparatus 100 to determine whether the engine is started. (S110).

In the above, the engine start completion is determined that the engine start is completed after the driver's engine start key operation is detected, when 750 rpm or more of the engine idle state stored in the memory is detected.

Therefore, when it is determined that the engine start is completed in the above, the engine control apparatus 200 determines that the engine speed, the coolant temperature, the vehicle speed, the TDC, the water, the intake temperature, the injector state, and the like when the coolant temperature is higher than a predetermined set reference value. It is determined whether the first condition, which is a condition of the various detection sensors, is satisfied (S120).

When it is determined that the first condition is satisfied, the engine control apparatus 200 determines whether the water detection sensor contact 'on' signal is applied from the water detection unit 150 provided in the intake pipe (S130).

When the water detection sensor contact 'on' signal is applied as shown in FIG. 4 (a) as water is present in the intake pipe, the engine control apparatus 200 detects that the detected value of the water detection sensor is a predetermined failure. It is determined whether the determination reference value has been exceeded (S140).

When it is determined that the detected value of the water detection sensor has exceeded the predetermined fault determination reference value as shown in FIG. 4 (a), the engine control apparatus 200 determines that the detected value of the water detection sensor is the predetermined fault. From the time point exceeding the reference value, the water detection sensor Count is increased by 1 as shown in FIG. 4 (b), and the increased water detection sensor count is shown as an alarm reference setting value as shown in FIG. 4 (b). It is determined whether it has reached (S150, S160).

When it is determined that the increased water detection sensor Count reaches the warning reference setting value, the engine control apparatus 200 as shown in FIG. 4C to inform the driver that water is present in the intake pipe. The fuel lamp and fuel injection timing control subroutines for controlling fuel quantity and fuel injection timing are performed in order to output a warning lamp lighting signal and to prevent water from flowing into the combustion chamber and to minimize cylinder damage due to oil film damage (S170, S180). .

However, when the increased water detection sensor Count does not reach the warning reference setting value, the engine control apparatus 200 outputs the normal fuel amount and fuel injection timing control signal stored in the memory (S181).

[Fuel amount and fuel injection timing subroutine]

Fuel amount and fuel injection timing control subroutine When the control subroutine is started, the engine control apparatus 200 checks the contact 'on' state of the water detection sensor provided in the intake pipe once again (S200 and S210).

If it is determined that the contact 'off' state of the water detection sensor provided in the intake pipe, the engine control device 200 performs the normal fuel amount and injection timing control and determines whether water exists in the intake pipe (S181). Return to.

However, if it is determined in the above that the contact 'on' state of the water detection sensor provided in the intake pipe is maintained continuously, the engine control device 200 is the final fuel injection timing and in order to minimize the water damage flows into the combustion chamber to damage the engine The first final fuel amount is calculated to output a corresponding control signal to reduce the output of the engine (S220, S230).

The final fuel injection timing may be calculated by subtracting the injection timing correction value stored in the memory from the injection timing determined according to the change in the operating state of the driving vehicle.

The primary final fuel amount may be calculated by subtracting the primary final fuel amount reduction correction value stored in the memory from the fuel amount determined according to the change of the operating vehicle operating state.

Subsequently, the engine control apparatus 200 determines whether the contact state of the water detection sensor keeps the 'on' state in order to determine whether water exists in the intake pipe again (S240).

When it is determined that water is continuously present in the intake pipe, the engine control apparatus 200 may determine that the water detection sensor Count is as shown in FIG. 4 (b) to prevent damage to the engine when the vehicle is operated for a long time. It is determined whether the time maintained over the warning reference setting value, that is, the warning progress time has elapsed the setting reference time (S250).

When it is determined that the warning progress time elapses from the preset reference time, the engine control apparatus 200 further reduces the first final fuel amount reduced in order to prevent damage to the engine when the vehicle is operated for a long time. The final fuel amount is calculated by subtracting the secondary fuel amount reduction correction value stored in the memory from the first final fuel amount, and after outputting a predetermined fuel amount control signal corresponding to the calculated final fuel amount, it is determined whether water is present in the intake pipe. The process returns to step S240 (S260).

However, if it is determined in step S260 that the final injection timing and the first fuel amount control are made, and there is no water in the intake pipe, the engine control apparatus 200 calculates the increased water detection sensor Count in step S150. As shown in FIG. 4B, normal fuel injection timing and fuel amount control are performed while decreasing by one (S300 and S310).

Subsequently, the engine control apparatus 200 determines whether the water detection sensor Count value reduced in the above reaches 0 (S320).

When the water detection sensor Count value does not reach 0 in the above, the engine control apparatus 200 performs a step (S220) of controlling the final injection timing and continues to decrease the water detection sensor Count value.

However, when it is determined in the above that the water detection sensor Count value reaches 0, the engine control apparatus 200 receives a predetermined control signal for controlling the warning lamp 'off' as shown in FIG. Output and return to the main routine (S330).

As described above, the present invention can improve the durability of the engine by preventing damage in the combustion chamber by determining whether water is present in the intake pipe when the engine coolant temperature is set at a start-off state or higher, thereby improving durability of the engine, and causing problems in a liner or the like. By reducing the time for finding the cause of the restart, maintenance efficiency can be improved.

Claims (7)

Determining whether water is present in the intake pipe when the coolant temperature in the engine start-up state is equal to or greater than a predetermined set reference value and the various sensors are normal; Counting the water survival time from the time when the output value of the water detection sensor is output above a predetermined failure determination reference value, when it is determined that water is present in the intake pipe; Judging that the bite existence time is counted more than a predetermined set warning reference set value in the step; If it is determined in the step that the water remaining time is counted more than the predetermined set warning reference set value, the engine fuel injection timing comprising the step of outputting a warning lamp lighting signal, and controlling the fuel amount and fuel injection timing; Fuel level control method. The method of claim 1, wherein the control of fuel amount and fuel injection timing comprises: rechecking whether water in the intake pipe is present; If it is determined in the step that there is no water in the intake pipe, performing normal fuel amount and injection timing control and returning to determining whether water is present in the intake pipe. The method of claim 2, further comprising: outputting a final fuel injection timing and a first final fuel amount reduction control signal when it is determined that water in the intake pipe continues to be present and re-determining whether water in the intake pipe is present; Determining whether the warning progress time has elapsed from the set reference time when it is determined that water is continuously present in the intake pipe at the step; And if it is determined that the warning progress time has elapsed from the set reference time, outputting the second final fuel amount control signal. 4. The engine fuel injection timing of claim 3, wherein the first final fuel amount further comprises subtracting a first final fuel amount reduction correction value stored in the memory from a fuel amount determined according to a change in a driving vehicle operating state. And fuel amount control method. The engine fuel injection timing and fuel amount according to claim 3, further comprising a step of calculating the final fuel injection timing by subtracting an injection timing correction value stored in the memory from the injection timing determined according to the change of the operating vehicle operation state. Control method. 4. The method of claim 3, wherein the secondary final fuel amount control further comprises subtracting the secondary fuel amount reduction correction value stored in the memory from the primary fuel amount control value. 4. The method of claim 3, further comprising: if it is determined that there is no water in the intake pipe, reducing the increased water detection sensor count by 1 and performing normal fuel injection timing and fuel amount control; Determining whether the water detection sensor count value decreased in the step reaches zero; And outputting a control signal for turning off the warning lamp when it is determined that the water detection sensor count value reaches 0 in the step.