KR19980053213A - Injection quantity correction method by cylinder-by-cylinder learning - Google Patents

Abstract

The present invention relates to a method for correcting the injection amount by the cylinder-specific learning of the purge amount, and when the electronic control device performs the purge control during engine operation, it is determined whether the amount of fuel flowing into the cylinder during analysis is received from the oxygen sensor. Determining whether it is in a rich state; Checking each cylinder to detect a cylinder biased; Adjusting the injection amount of the cylinder in which the fuel amount inflow is biased; By measuring the exhaust gas output to each cylinder with an oxygen sensor and correcting the injection for each cylinder, the injection amount correction method by the cylinder-by-cylinder learning of the purge amount having the effect of improving the emission or fuel efficiency is provided.

Description

Injection amount correction method by learning per cylinder of purge amount

The present invention relates to a method for correcting the injection amount by the learning of each cylinder of the purge amount, in more detail, to learn the cylinder-specific learning of the purge amount to check the amount of fuel flowing into each cylinder during the purge control to prevent the bias to a specific cylinder It is related with the injection amount correction method.

The technology for producing automobiles requires technologies in various fields, and in general, it can be said to be a technique for integrating the technology of general science fields such as machinery, electronics, and chemistry.

In recent years, as a result of the development of automobiles, not only design, machinery, and operation, but also the technology of the internal electric system has emerged, it has developed into a technology that improves the performance of automobiles. The diversification has spurred the development of devices other than the original functions of automobiles.

In addition, the development of safety devices and the like in driving a car is also important and many products are being produced.

For example, there is an air bag, a seat belt, etc. in consideration of the driver's safety in a car crash.

However, conventionally, the purge control valve is opened at a specific engine speed and temperature, so that blow-by gas inside the canister is biased to a specific cylinder when it is introduced into each cylinder through an intake manifold.

Accordingly, an object of the present invention is to solve the above problems, and when purge control is performed by checking the oxygen sensor signal to adjust the amount of fuel biased to a specific cylinder to learn the cylinder by the amount of purge to improve emission and fuel efficiency It is to provide a injection amount correction method by the.

As a means for achieving the above object, the characteristic is that if the electronic control device performs the purge control during the engine operation, the signal is input from the oxygen sensor and the amount of fuel flowing into the cylinder during the analysis is lean. Determining whether it is in a state; Checking each cylinder to detect a cylinder biased; And adjusting the injection amount of the cylinder in which the fuel amount inflow is biased.

1 is a graph showing the output of an oxygen sensor according to an embodiment of the present invention,

2 is an injection amount correction device by learning the cylinder by the purge amount according to an embodiment of the present invention,

3 is a flow chart of the injection amount correction control by the learning per cylinder of the purge amount according to an embodiment of the present invention.

Best Mode for Carrying Out the Invention The present invention will be described in detail with reference to the accompanying drawings.

The operation of the injection amount correction method by the configuration of the attached FIG. 2 and FIG. 3 and the learning by the cylinder of the purge amount by the above configuration is as follows.

An oxygen sensor 30 which detects and outputs an oxygen component of the exhaust gas generated by the action of the engine; An electronic control device 20 which receives a signal from the oxygen sensor 30, analyzes an oxygen component of the discharged gas, detects an amount of fuel introduced into each cylinder, and controls an injection amount for adjusting the fuel introduced into each cylinder; ; It consists of an injector 10 that receives the injection signal from the electronic control device 20 to inject fuel.

Characteristic of the operation of the electronic control device, the electronic control device for the purge control during the engine operation step of receiving a signal from the oxygen sensor and analyzing (S20, S30); Determining whether the amount of fuel flowing into the cylinder after the oxygen amount analysis is in a lean state or a rich state (S40); Detecting the state of the oxygen sensor after reducing the injection amount of the first cylinder of the engine (S50, S60); Detecting the state of the oxygen sensor after reducing the injection amount of the engine No. 3 cylinder (S70, S80); Detecting the state of the oxygen sensor after reducing the injection amount of the second cylinder of the engine (S90 and S100); Detecting the state of the oxygen sensor after reducing the injection amount of the engine No. 4 cylinder (S110, S120); The electronic control apparatus determines a cylinder in which the fuel amount is biased in each cylinder (S130); In order to adjust the injection amount of the cylinder biased in the step (S130), the step of reducing a certain correction amount at the reference value (S140).

In the canister (not shown), the blow-by gas is introduced into the intake manifold, and the electronic control device 20 controls the amount of fuel determined by the map as an injection signal to operate the injector 10 so that the fuel and the blow-by gas flow into the cylinder. Inflow (S20).

The oxygen amount of the exhaust gas is measured by the oxygen sensor 30 in the process of exhausting the fuel combusted in each cylinder in the state of the purge control and the exhaust gas (S30).

The electronic control apparatus 20 determines whether the amount of fuel introduced into each cylinder is in a lean state or a rich state by using the signal measured by the oxygen sensor (S40).

The electronic control apparatus 20 determines the case where a rich signal is output by the inflow of blow-by gas at the time of purge control from the oxygen concentration reference value of the exhaust gas by the fuel amount by map data (S40).

When the rich signal is output larger than the reference value in the step S40, the fuel amount of the first cylinder is reduced and the determination is made as described above (S50 and S60).

If the rich signal is output larger than the reference value as in step S60, the injection amount of the third cylinder is reduced and determined (S70 and S80).

If the rich signal is output larger than the reference value as in step S80, the injection amount of the second cylinder is reduced and determined (S90 and S100).

If the rich signal is output larger than the reference value as in step S100, the injection amount of the fourth cylinder is reduced and determined (S110 and S120).

In operation S130, the electronic control apparatus 20 determines a cylinder into which the blow-by gas is biased and flows in (S130), and reduces the injection amount of the cylinder to be biased by a specific amount from the basic injection amount (S140).

The reason why the blow-by gas is biased and introduced into the cylinder is that a difference in the concentration of the blow-by gas is caused depending on the state in which the blow-by gas is located in the intake manifold.

As described above, in the embodiment of the present invention, by measuring the exhaust gas output to each cylinder with an oxygen sensor to correct the injection for each cylinder, the injection amount correction by the learning of each cylinder of the purge amount having the effect of improving the emission or fuel economy Provide a method.

Claims (2)

Determining, by the electronic controller, whether the amount of fuel flowing into the cylinder is in a lean state or a rich state while receiving a signal from an oxygen sensor during engine operation; Checking each cylinder to detect a cylinder biased; The injection amount correction method by the cylinder-by-cylinder learning of the purge amount, characterized in that for adjusting the injection amount of the cylinder in which the fuel amount inflow is biased. The method of claim 1, wherein the bias cylinder detection, A method of correcting the injection amount by learning of each cylinder of the purge amount, wherein the amount of fuel in each cylinder is decreased by a certain value and the cylinder is judged to be a biased cylinder when there is a change in the lean or rich determination state.