KR0153119B1 - Engine control method in case of map sensor failure - Google Patents

Abstract

The present invention relates to an engine control method when a MAP sensor fails, and calculates a volumetric efficiency (VE) based on the RPM of the engine detected by the RPM detector 24 and the MAP value detected by the MAP sensor during normal operation of the MAP sensor. An electronically controlled fuel injection device for an automobile that controls an engine based on the volumetric efficiency (VE), wherein the RPM of the engine is detected by the RPM detector 24 and the TPS detected by the throttle position sensor 16. A first step of calculating MAP ', a second step of determining whether the MAP sensor is broken based on the MAP failure code generated by the ECU 26, and if the MAP sensor failure is detected as a result of the determination of the second step Comprising a third step of calculating the volumetric efficiency (VE ') based on the RPM and the MAP' of the engine to control the engine based on the volumetric efficiency (VE '). MA using the TPS detected by the RPM) and the throttle position sensor. Calculate the P 'value and perform engine control based on the corresponding MAP' value.

Description

Engine control method in case of MAP sensor failure

1 is a block diagram showing the engine control apparatus when the MAP sensor failure according to an embodiment of the present invention.

2 is a view for explaining the engine control method when the MAP sensor failure according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

2: fuel tank 4: fuel pump

6: stottle body 8: surge tank

10: injection valve 12: intake manifold

14: MAP sensor 16: Throttle position sensor

18: igniter 20: ignition coil

22: engine part 24A: spark plug

24: PRM detector 26: ECU

26A: Memory

The present invention relates to an engine control method when a MAP sensor fails. More specifically, the MAP value is calculated by using an engine rotational speed (RPM) and a throttle position sensor detected when the MAP sensor fails. It relates to an engine control method in case of failure of a MAP sensor that can control the

As is well known, currently produced vehicles are electrically supplied with intake air in response to the demand for high-precision control to simultaneously satisfy the purifying exhaust gas, reducing fuel consumption, and improving output in a mixer supplied to a gasoline engine. An electronically controlled fuel injection device is provided which detects and injects the fuel according to the operating conditions of the engine.

In addition, the ECU (Eletric Control unit) for controlling the electronically controlled fuel injection unit is based on the electrical signal converted in accordance with the detected state through the sensor unit consisting of a variety of sensors for detecting the state of the engine fuel injection timing and injection amount In the control, the engine was driven and controlled based on an electrical signal (ie, a MAP signal) applied from a manifold absolute pressure (MAP) sensor installed in the intake mad fold to detect the absolute pressure in the intake mad fold.

On the other hand, if the electrical signal from the MAP sensor is not applied to the ECU because the MAP sensor does not perform a normal operation due to a mechanical defect, the control of fuel injection timing or injection amount by the ECU is abnormal. As a result of the improper operation of the engine, there is a problem such as low energy efficiency or a traffic accident caused by abnormal operation of the engine.

Thus, the present invention has been created to solve the above problems, MAP using the TPS detected by the engine speed (RPM) and the throttle position sensor when the MAP sensor failure to generate the MAP 'and then It is an object of the present invention to provide an engine control method in case of failure of a MAP sensor that can control fuel injection timing and injection amount based on MAP '.

Engine control method when the MAP sensor failure according to an embodiment of the present invention for realizing the above object is volumetric efficiency based on the RPM of the engine detected by the RPM detection unit in the normal operation of the MAP sensor and the MAP value detected by the MAP sensor An electronically controlled fuel injection device for a vehicle that calculates (VE) and controls an engine based on the volume efficiency (VE), wherein the engine is detected by the RPM detector and based on the TPS detected by the throttle position sensor. A first step of calculating MAP ', a second step of determining whether the MAP sensor is broken based on a MAP failure code generated by the ECU, and if the MAP sensor failure is detected as a result of the determination of the second step, the engine It is characterized in that it comprises a third step of calculating the volumetric efficiency (VE ') based on the RPM and the MAP' of controlling the engine based on the volumetric efficiency (VE ').

Preferably, in the first step, the MAP 'is calculated based on MAP' = Table (RPM, TPS) [Equation (1)], and in the third step, the volume efficiency (VE ') is VE' = Table. Arithmetic based on (RPM, MAP ') [Formula 3].

According to the present invention described above, when the MAP sensor is broken, the MAP 'value inferred from the TPS detected through the engine speed and the throttle position sensor is generated, and the fuel injection timing and the injection amount of the engine are controlled based on the MPA' value. It is possible to eliminate the problem caused by the failure.

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

1 is a block diagram of an engine control apparatus when a MAP sensor fails according to an embodiment of the present invention, in which 2 is a fuel tank in which fuel such as gasoline is stored, and 4 is a pumping operation. It is a fuel pump for supplying the fuel stored in the fuel tank (2).

In addition, reference numeral 6 is a throttle body for passing the air from the outside passing through the air cleaner (not shown) by adjusting the air amount according to the valve operation state of the stottle valve (not shown), 8 is the throttle body It is a surge tank in which air supplied by the adjustment from (6) and fuel from the fuel pump 4 are mixed and temporarily stored.

Reference numeral 10 denotes a cold start injector that is injected to the surge tank 8 when the air-fuel ratio is controlled under the control of the ECU 26 to be described later, and the cooling water temperature is low to improve startability at low temperatures. The injection valve is composed of an injector for directly injecting the intake manifold 12 to be described later in a state of a predetermined temperature or more (that is, running state), 12 is supplied with a mixer from the surge tank (8) and the injection valve (10) It is an intake magnet fold that is supplied with a mixture of fuel and air injected directly from the reactor and minimizes its resistance.

Further, reference numeral 14 denotes a MAP sensor installed in the intake manifold 12 to electrically detect the negative pressure in the intake manifold 12 to measure the amount of intake air, and 16 denotes a device in the throttle body 6. It is a throttle position sensor for detecting the TPS value according to the idling rotation and the high load state according to the opening degree of the throttle valve.

Reference numeral 18 denotes an igniter for controlling the primary current of the ignition coil 20 under the control of the ECU 26 to be described later, and 20 denotes an ignition plug 22A based on the primary current by the igniter 18. Is an ignition coil for boosting to a high voltage current by using magnetic induction and mutual induction, and 22 is a mixer applied from the intake manifold 12 with an ignition plug 22A for igniting an electric spark in the mixer. The engine unit for converting the heat energy generated by the combustion to the kinetic energy, 24 is an RPM detection unit for detecting the rotational speed of the engine unit 22, that is, the engine revolutions per minute (RPM).

In addition, reference numeral 26 denotes a TPS according to the idling rotation and the high load state detected by the negative pressure value (MAP value) in the intake manifold 12 detected by the MAP sensor 14 and the spot position 16. , ECU (Electric Control Unit) for controlling the fuel injection timing and injection amount based on the RPM detected by the RPM detection unit 24, the ECU 26 in the present invention when the failure of the MAP sensor 14 Simultaneously with generating the MAP error code, the MAP value is generated based on the RPM detected through the RPM detection unit 24 and the TPS detected by the throttle position sensor 16, and then MAP 'is generated based on the MAP'. VE '(Volumetric Efficiency) is calculated and the injection valve 10, the igniter 18, etc. which are connected to the rear stage are controlled.

The ECU 26 also has a memory 26A for storing the MAP 'therein.

Hereinafter, the operation of the present invention will be described in detail with reference to a flowchart for explaining an engine control method when a MAP sensor fails according to an embodiment of the present invention.

First, the negative pressure in the intake manifold 12 is detected through the MAP sensor 14 in step 30, and the idling rotation and the high load state (TPS) according to the throttle valve opening degree are detected through the throttle position sensor 16. Detects and detects the RPM of the engine through the RPM detection unit 24.

Subsequently, in step 31, the ECU 26 performs a MAP using a table function based on the MAP value detected through the MAP sensor 14 and the corresponding TPS detected through the throttle position sensor 16 in step 30. 'Calculate the bar, the formula to calculate the MAP' is as follows.

MAP = Table (RPM, TPS). . . . . (1)

On the other hand, the ECU 26 stores the MAP 'generated in the step 31 in the memory 26A and proceeds to step 32. In this step 32, the ECU 26 performs the RPM detection unit ( By calculating the volumetric efficiency (VE) based on the RPM of the engine detected through the 24 and the MAP value detected by the MAP sensor 14 to adjust the fuel injection timing and injection amount based on the VE To control the engine, the equation for calculating the VE in the ECU 26 is as follows.

VE = Table (RPM, MAP). . . . . (2)

The ECU 26 performs engine control corresponding to the VE calculated based on Equation (2), and proceeds to step 33 to determine whether the MAP failure code is generated in the ECU 26. If the MAP fault code generation is not detected in step 33, the ECU 26 proceeds to step 32 and continuously performs engine control on fuel injection timing or injection amount in accordance with the VE calculated in step 32.

On the other hand, when the MAP sensor 14 is not normally operated due to a component failure or the like, and the electrical signal according to the negative pressure state in the intake manifold 12 is not applied to the ECU 26, the ECU 26 ) Detects a failure state of the MAP sensor 14 and generates a MAP failure code for it.

If the generation of the MAP fault code in the ECU 26 is detected in step 33 due to the above circumstances, the ECU 26 proceeds to step 34 in accordance with the determination result of step 33 and calculates in step 31. And reads out the MAP 'stored in the memory 26A, calculates the VE' based on the MAP ', and controls the engine by adjusting the fuel injection timing and the injection amount in accordance with the corresponding VE'. VE 'is calculated using the RPM of the engine or the MAP' read from the memory 26A.

VE '=-Table (RPM, MAP'). . . . . (3)

That is, the ECU 26 calculates the volumetric efficiency VE based on the TPS detected through the throttle position sensor 16 and the MAP value detected through the MAP sensor and the RPM of the engine detected through the RPM detector 24. Control the engine and at the same time calculate the MAP 'using the TPS detected by the throttle position sensor 16 and the RPM of the engine and store the MAP' in the memory 26A. In (26), when the MAP failure code according to the corresponding MAP sensor 14 is generated, the volume efficiency (VE ') is calculated based on the RPM and the MAP', and the engine is controlled based on the VE '. It becomes possible.

As described above, according to the engine control method when the MAP sensor fails according to an embodiment of the present invention, the MAP 'is calculated using the TPS and the RPM of the engine through the throttle position sensor when the MAP sensor fails, and the volume according to the MAP' is calculated. By calculating the efficiency (VE ') and performing engine control such as fuel injection timing or injection volume based on the volumetric efficiency, the engine control is normally performed even when the MAP sensor fails, thereby improving engine performance and driver safety. It becomes possible to plan operation.

The present invention is not limited to the above circumstances, and various modifications can be made without departing from the technical spirit of the present invention.

Claims (3)

The vehicle which controls the engine based on the volume efficiency VE by calculating the volume efficiency VE based on the RPM of the engine detected by the PRM detector 24 and the MAP value detected by the MAP sensor during the normal operation of the MAP sensor. In the electronically controlled fuel injection device of the first step of calculating the MAP 'based on the RPM of the engine detected by the RPM detection unit 24 and the TPS detected by the throttle position sensor 16, ECU 26 In the second step of determining whether the MAP sensor failure based on the MAP failure code generated in the second step, if the failure of the MAP sensor is detected as a result of the determination of the second step, the volumetric efficiency based on the RPM of the engine and the MAP VE ') and a third step of controlling the engine based on the volumetric efficiency (VE'). The method of claim 1, wherein in the first step, the MAP 'is calculated based on MAP = Table (RPM, TPS) [(1)]. The engine control in case of failure of the MAP sensor according to claim 1, wherein in the third step, the volumetric efficiency VE 'is calculated based on a formula of VE' = Table (RPM, MAP ') [(3)]. Way.