JP4924898B2 - Engine start-up control device - Google Patents

Description

  The present invention relates to an engine start-time control apparatus, and more particularly to an engine start-time control apparatus that can remove air accumulated in a fuel system of an engine without providing a dedicated component when the engine is started for the first time.

  Some engines mounted on vehicles include a fuel system that pumps fuel from a fuel tank to a fuel pipe and supplies the fuel from a fuel injection valve. After the assembly of such a vehicle at the factory line, when the engine is started for the first time, air has accumulated in the fuel system of the engine (the fuel flow path from the fuel tank to the fuel injection valve). There is a problem that fuel is not injected from the fuel injection valve until it is completely removed, cranking is prolonged, and time is required for starting. Moreover, since such time is required, the problem that productivity falls arises.

As a countermeasure against such a problem, as a technique for performing air purge control for extracting air from the fuel flow path from the fuel tank to the fuel injection valve after assembly of the vehicle, the engine after vehicle assembly is first started. There is an engine start-up control device that performs air purge control for forcibly extending the opening time of the fuel injection valve when detected.
Japanese Patent Laid-Open No. 8-100696 JP 2003-20976 A

  This start-up control device is a technology that is effective when the engine is started for the first time after assembly on the vehicle factory line, and the fuel flow path from the fuel tank to the fuel injection valve is filled with fuel during normal operation. If this is used, there is a possibility of misfire due to overrich, so it is necessary to pay attention to the timing of air purge execution.

An engine start control apparatus for solving these problems is provided with an input terminal for inputting a predetermined inspection signal. When the engine is started with a predetermined input signal input to the input terminal, air purge control is performed. There is something that is set to.
JP-A-8-326583 JP-A-9-242582

  However, since the engine start control device disclosed in Patent Documents 3 and 4 needs to be provided with a dedicated input terminal for inputting a predetermined inspection signal, the system is complicated and the cost is increased. There was a problem.

  An object of the present invention is to simplify the system by allowing air accumulated in the fuel system of the engine to be extracted without providing a dedicated component when the engine is started for the first time.

The present invention includes a power source for supplying electric power mounted on a vehicle, a fuel injection control device for controlling a fuel injection amount injected from a fuel injection valve, and an electric power from the power source when connected to the fuel injection control device. An external device for diagnosing whether or not the fuel injection control device is malfunctioning, and the external device is connected to the fuel injection control device, and an air purge execution flag is stored in the storage unit of the fuel injection control device by the external device. Storage processing means for storing the air purge, and air purge execution means for executing air purge only when an air purge execution flag is stored in the storage unit of the fuel injection control device at the time of first cranking after assembly on the factory line. It is provided with.

  The engine start-up control device according to the present invention does not require a dedicated part for performing an air purge for removing air accumulated in the fuel system of the engine, and can shorten the time required for the first engine start. As a result, the engine start control device can contribute to simplification of the system.

The engine start control device according to the present invention eliminates the need to provide a dedicated component for performing the air purge by executing the air purge only when the air purge execution flag is stored at the time of the first cranking. This simplifies the process.
Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment. FIG. 1 is a flowchart of writing an air purge execution flag, FIG. 2 is a flowchart of air purge execution, FIG. 3 is a schematic side view of a vehicle equipped with a start time control device, and FIG. 4 is a system block diagram of the start time control device. In FIG. 3, 1 is a vehicle, 2 is an engine, 3 is a transmission, 4 is a fuel tank, 5 is a fuel pipe, 6 is a fuel injection valve, and 7 is a wheel. An engine 2 mounted on the vehicle 1 includes a fuel system that pumps fuel from a fuel tank 4 to a fuel pipe 5 and injects fuel from a fuel injection valve 6 to an intake port and a combustion chamber of the engine 2. The fuel injection amount of the fuel injection valve 6 is controlled by the fuel injection control device 8.
The fuel injection control device 8 is mounted on the vehicle 1 as an electronic control device that controls an object to be controlled by an electronically stored program. Further, the vehicle 2 is equipped with, for example, a shift control device 9 of the transmission 3 as another electronic control device. The fuel injection control device 8, the shift control device 9, and the like are connected by an in-vehicle communication line 10 including a serial communication line of a vehicle-mounted network system or a CAN (CONTROLLER AREA NETWORK) communication line.
A vehicle-side connector 12 of the connector device 11 is connected to the in-vehicle communication line 10. The vehicle-side connector 12 is provided with an external device-side connector 13 of the connector device 11 so that it can be connected and disconnected. The external device side connector 13 is connected to an external device such as a failure diagnosis tester 15 provided outside the vehicle 1 by an external communication line 14 formed of a serial communication line or a CAN (CONTROLLER AREA NETWORK) communication line.

The fuel injection control device 8 and the shift control device 9 that are a plurality of electronic control devices connected via the in-vehicle communication line 10 are configured as shown in FIG. Since the fuel injection control device 8 and the shift control device 9 that are electronic control devices are configured in the same manner, the fuel injection control device 8 will be described as an example.
The fuel injection control device 8 is provided with a communication port 16 for performing data communication with the failure diagnosis tester 15 which is an external device through the connector device 11 via the in-vehicle communication line 10, and a signal from the input processing circuit 21 described later is provided. A control program for controlling the control object is provided by calculating the optimum control amount for the fuel injection valve 6 that is the control object based on this and providing a central processing unit (CPU) 17 that outputs a control signal based on the calculation result. And a program storage unit (ROM) 18 composed of a non-volatile memory for storing information, and a rewritable data storage unit (RAM) 19 for storing information for the central processing unit 17 to perform calculations.
Further, the fuel injection control device 8 inputs a signal from a control sensor 20 (for example, an engine speed sensor, an engine water temperature sensor, a battery voltage sensor, etc.) 20 through a signal input line 21 and performs waveform processing. An output control circuit 24 for receiving a control signal from the central processing unit 17 and outputting a drive signal through an output signal line 23 to the fuel injection valve 6 which is a control actuator is another electronic control device. A communication port 25 for performing data communication with the transmission control device 9 and the like through the in-vehicle communication line 10 is provided, and a power source 26 for supplying electric power mounted on the vehicle 1 and an ignition switch for inputting an ignition signal (IG signal). 27 is provided.

The power source 26 of the vehicle 1 connects a vehicle side power line 29 and a vehicle side ground line 30 to the vehicle side connector 12 of the connector device 11. The power supply 26 is connected to the failure diagnosis tester 15 through an external device side connector 13 of the connector device 11 by an external device side power line 31 and an external device side ground line 32.
When the failure diagnosis tester 15 is connected to the fuel injection control device 8, the transmission control device 9, or the like via the connector device 11, the failure diagnosis tester 15 is activated by being supplied with power from the power supply 26. The failure diagnosis tester 15 has a failure diagnosis function activated by activation, is connected to the fuel injection control device 8 and the shift control device 9 via the communication port 16, and is stored in the data holding unit (backup RAM) 33 of the data storage unit 19. It is determined whether or not the fuel injection control device 8 or the shift control device 9 has failed from the information such as the failure code DTC and the traveling state. The data holding unit 33 is supplied with power from a battery or the like so that the written information can be stored and held even when the power is turned off.

The failure diagnosis tester 15 includes a storage processing unit 34. The storage processing unit 34 connects the failure diagnosis tester 15 to the fuel injection control device 8 on the factory line, transmits an air purge execution flag to the fuel injection control device 8 by the failure diagnosis function of the failure diagnosis tester 15, and the data storage unit 19. The air purge execution flag is stored in the data holding unit 33.
Further, the fuel injection control device 8 includes an air purge execution unit 35 in the program storage unit 18. The air purge execution means 35 executes the air purge only when the air purge execution flag is stored in the data storage unit 19 of the fuel injection control device 8 at the first cranking of the engine 2. Further, the air purge execution means 35 erases the air purge execution flag after the first cranking of the engine 2 is executed.
A fuel injection control device 8 that controls the fuel injection valve 6, a failure diagnosis tester 15 that is an external device for diagnosing the fuel injection control device 8, and a storage process that stores an air purge execution flag in the fuel injection control device 8 The start-up control device 36 of the engine 2 is constituted by the means 34 and the air purge execution means 35 that executes air purge by the air purge execution flag and erases the air purge execution flag.
When the engine 2 is assembled on the factory line of the vehicle 1 and the engine 2 is started for the first time, when the air purge execution flag is present, the engine control unit 36 starts from the fuel flow path from the fuel tank 4 to the fuel injection valve 6. In order to remove air, the fuel injection valve 6 is opened to perform air purge, and after the air purge is executed, the air purge execution flag is deleted.

Next, the operation will be described.
As shown in FIG. 1, when the failure diagnosis tester 15 is connected to the fuel injection control device 8 in the factory line of the vehicle 1, the start time control device 36 of the engine 2 starts control (A01), and the failure diagnosis tester 15 Then, it is determined whether or not there is a request for writing the air purge execution flag to the data holding unit 33 of the data storage unit 19 of the fuel injection control device 8 (A02).
If this determination (A02) is NO, this determination (A02) is repeated. If this determination (A02) is YES, the storage processing means 34 writes the air purge execution flag in the data holding unit 33 of the data storage unit 19 and stores it (XPURGE = 1) (A03), and the control ends (A04). .
The air purge execution flag written in the data holding unit 33 of the data storage unit 19 is stored and held even when the power is turned ON / OFF (the ignition switch 27 is turned ON / OFF).

As shown in FIG. 2, when the engine 2 is started for the first time after the assembly of the vehicle 1 on the factory line, the engine start control device 36 starts control (B01) and cranking has started. Is determined (B02).
If this determination (B02) is NO, this determination (B02) is repeated. If this determination (B02) is YES, it is determined whether the air purge execution flag is stored (XPURGE = 1) in the data holding unit 33 of the data storage unit 19 (B03).
If this determination (B03) is YES, air purge control is executed (B04), and it is determined whether the engine 2 has been started (B05).
If this determination (B05) is NO, the process returns to the execution of air purge control (B04). When this determination (B05) is YES, the air purge execution means 35 deletes the air purge execution flag stored in the data holding unit 33 of the data storage unit 19 (XPURGE = 0) (B06), and the control is terminated ( B07).
On the other hand, if the determination of whether the air purge execution flag is stored in the data storage unit 19 (B03) is NO, normal engine 1 start control is executed (B08), and the control is terminated (B07).

In this way, the start-up control device 36 of the engine 2 connects the failure diagnosis tester 15 to the fuel injection control device 8, and air purges the data storage unit 19 of the fuel injection control device 8 by the storage processing means 34 of the failure diagnosis tester 15. The execution flag is stored, and the air purge is executed by the air purge execution means 35 only when the air purge execution flag is stored in the data storage unit 19 of the fuel injection control device 8 during the first cranking.
Accordingly, the start time control device 36 uses the air purge execution flag to reach the fuel injection valve 6 from the fuel tank 4 of the engine 2 via the fuel pipe 5 at the time of the first engine start after assembly in the vehicle factory line. Since the air accumulated in the fuel system can be quickly extracted, it is not necessary to provide a dedicated part for performing an air purge to remove the air accumulated in the fuel system of the engine 1, and the time required for starting the engine for the first time Can be shortened. For this reason, the starting control device 36 of the engine 2 can contribute to simplification of the system.
Further, the start-up control device 365 of the engine 2 erases the air purge execution flag after the first cranking is executed by the air purge execution means 35.
As a result, the start time control device 36 can erase the air purge execution flag once cranking is performed, and can automatically erase the control specifications that are no longer necessary after the engine is started. For this reason, the start time control device 36 of the engine 2 does not adversely affect the second and subsequent start control due to forgetting to delete.

  The engine start control device of the present invention does not require any dedicated parts, can reduce the time required for the first engine start, can contribute to simplification of the system, and includes a fuel injection valve. It can be applied to an electronic control device of an engine.

It is a flowchart of the air purge execution flag writing of the engine start time control device showing an embodiment. It is a flowchart of the air purge execution of the engine start-up control device showing an embodiment. It is a schematic side view of a vehicle equipped with an engine start-up control device showing an embodiment. 1 is a system block diagram of an engine start-up control device showing an embodiment. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine 4 Fuel tank 5 Fuel piping 6 Fuel injection valve 8 Fuel injection control apparatus 11 Connector apparatus 15 Failure diagnosis tester 17 Central processing unit 19 Data storage part 33 Data holding part 34 Storage processing means 35 Air purge execution means 36 Control at start-up apparatus

Claims (2)

A power source for supplying electric power mounted on the vehicle;
A fuel injection control device for controlling the fuel injection amount injected from the fuel injection valve;
An external device for diagnosing whether or not the fuel injection control device is faulty by being activated by power from the power source when connected to the fuel injection control device;
Storage processing means for connecting the external device to the fuel injection control device and storing an air purge execution flag in the storage unit of the fuel injection control device by the external device;
And an air purge execution means for performing air purge only when an air purge execution flag is stored in the storage unit of the fuel injection control device at the time of first cranking after assembly on the factory line. Control device for starting the engine. 2. The engine start control device according to claim 1, wherein the air purge execution unit erases the air purge execution flag after execution of cranking for the first time after assembly in a factory line .

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