KR20030050127A - Engine triggering control system in vehicle and method thereof - Google Patents

Abstract

PURPOSE: A system and a method for controlling the starting of an engine are provided to improve the startability of an engine by reducing the time for detecting engine rpm and stabilizing the determination of ignition time. CONSTITUTION: Cranking is started by a start motor with response to the input of a trigger signal from an ignition switch(S101). The TDC(Top Dead Center) of a firstly sensed cylinder is determined as a reference position(S102). The normal detection of the TDCs of respective cylinders is decided(S103). Initial engine starting is controlled via an injector and an ignition coil by applying all data for engine starting(S104). The normal engine starting is detected(S105). If the engine is not turned on, failure information is outputted(S108). Otherwise, a target engine rpm is determined depending on the change of cooling water temperature and load and maintains the idle rpm by adjusting the fuel injection amount and ignition time(S106,S107).

Description

ENGINE TRIGGERING CONTROL SYSTEM IN VEHICLE AND METHOD THEREOF

The present invention relates to an initial start control method of an engine, and more particularly, to improve startability by tracking an engine speed based on a TDC (TOP DEAD CENTER) of the # N-th cylinder first sensed at an initial start-up. An engine start control apparatus and method are disclosed.

In general, when the engine speed is maintained at about 200 RPM suddenly by the start motor while the engine maintains the start-off state, when the minimum engine speed that can be recognized by the engine controller is reached, the engine controller is initialized from the set map table. Engine rotational speed, volumetric efficiency (VE), manifold pressure, air-fuel ratio (PHI) for fuel supply, which are composed of the opening value of the throttle valve required for starting, the idle rotational speed and the required rotational speed. Applying the air-fuel ratio in the cold start, the ignition timing control value, etc. to ensure that the engine starts stable.

This means that if the engine speed is detected normally by the engine control unit while the crankshaft is cranked three times during start-up by the start motor, the engine starts to be stable, but if the engine speed cannot be detected normally by the engine control unit, the engine The start stop and warning lights are turned on to allow the operator to trigger again.

In order to control the engine startability as described above, the engine controller applies a signal of a cam position sensor detected as one rotation of the cam shaft when two revolutions of the flywheel are performed, and a sewing machine installed in the TDC portion of the sixth cylinder is applied. The engine startability is controlled by centrally managing the TDC in cylinder 1 through the detection of MISSING TOOTH.

In the conventional engine start control method as described above, by managing the TDC of the first cylinder on the basis of the sixth cylinder, when failing to detect the missing tooth, it is necessary to detect the TDC of the first cylinder while rotating once again. The detection force is lowered due to the increase in the rotational speed, and the engine warning lamp is turned on because the missed tooth cannot be detected due to the poor triggering of the cam position sensor during the initial start-up.

Therefore, a start delay occurs or the engine warning light is turned on even when the initial startability is not weak.

In addition, each cylinder is identified by detecting and calculating the number of teeth on the basis of the TDC of the sixth cylinder, which requires a lot of computational functions of the engine control device, which does not efficiently use the resources of the processor, and is manufactured due to the processing of many teeth. There is a disadvantage to the hassle.

The present invention has been invented to solve the above problems, its purpose is to change the shape of the tooth that senses the cam position so that the TDC for each cylinder at the initial start-up can be centralized management of each cylinder When triggering, the engine speed is detected based on the first sensed TDC of the #N th cylinder to determine the ignition timing.

That is, when the TDC detection of the first cylinder fails, the engine speed is detected based on the TDC of the second cylinder, and the ignition timing and various starting application variables are applied to improve engine startability and tracking.

1 is a configuration block diagram of an engine start control apparatus according to the present invention.

2 is a waveform diagram of a cylinder-specific TDC signal according to an embodiment of the present invention.

3 is a flowchart of an embodiment of performing engine start control in the present invention.

4 is a waveform diagram of a cam position sensor detection signal conventionally applied.

The present invention for achieving the above object is a cam for detecting the TDC for each cylinder through the detection of the ignition switch for detecting the starting request of the driver, the crank angle sensor for detecting the position of the crankshaft, and the tooth formed on the cam shaft A control unit for determining fuel injection amount and ignition timing for starting the engine after detecting the engine rotation by detecting the TDC of each cylinder based on the position sensor and the TDC of the #Nth cylinder first sensed by the cam position sensor when the engine starts to be requested. An injector that opens the nozzle for a set time in accordance with the control signal of the controller and injects the amount of fuel calculated in each cylinder, and an ignition coil that determines the ignition timing for each cylinder by interrupting the primary coil according to the control signal of the controller. It is characterized by including.

In addition, the present invention is the process of setting the TDC of the # N-th cylinder first sensed from the cam position sensor to the reference position when triggering by the engine start request, determining whether the TDC for each cylinder is detected according to the triggering, Detecting the engine speed by detecting the TDC for each cylinder to determine the ignition timing for each cylinder, and applying the determined ignition timing for each cylinder, characterized in that it comprises a process for turning on the engine.

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

As can be seen in Figure 1 the engine start control apparatus according to the present invention is the ignition switch 10 and the crank angle sensor 20, the cam position sensor 30, the control unit 40, the injector 50, the ignition coil ( 60) and the display unit 70, the ignition switch 10 detects the driver's start request signal and outputs an electrical signal for it, the crank angle sensor 20 is the engine speed by detecting the position of the crankshaft Detect.

The cam position sensor 30 detects the TDC of each cylinder through the detection of the tooth formed in the camshaft and outputs an electrical signal therefor.

The shape of the tooth formed on the cam shaft is formed by dividing the shape of the pulse for each cylinder so as to detect the position of the TDC for each cylinder as shown in FIG.

The controller 40 analyzes the signal of the crank angle sensor 20 and the signal of the cam position sensor 30 when the input of the signal for requesting engine start is detected from the ignition switch 10, and then firstly analyzes the signal of the cam position sensor 30. TDC of each cylinder is detected based on the detected TDC of the # N-th cylinder to determine engine rotation, and then the fuel injection amount and ignition timing for starting the engine are determined and controlled.

The injector 50 injects the amount of fuel calculated in each cylinder by opening the nozzle for a set time according to the control signal applied from the controller 40.

The ignition coil 60 interrupts the primary coil according to a control signal applied from the controller 40 to determine the ignition timing for each cylinder.

The display unit 80 instructs the driver about the engine start failure due to the failure to detect the engine speed normally when the engine starts to be requested.

Operation of improving engine startability in the present invention including the function as described above is as follows.

When an input of a trigger signal for requesting engine start is detected from the ignition switch 10 in the engine stop state, cranking is started by driving the start motor (S101).

At this time, the control unit 40 sets the #N th cylinder TDC first sensed by the cam position sensor 30 as a reference position (S102), and then calculates the engine speed by detecting the TDC for each cylinder, so that the cam position sensor As shown in FIG. 2, it is determined whether TDC for each cylinder is detected normally from 30 at 30 (S103).

At this time, if the TDC for each cylinder is not normally detected, the operation returns to the operation of re-detecting the engine start request, and if the TDC for each cylinder is normally detected, the control unit 40 generates general data necessary for starting the engine, that is, at initial start-up. Filling engine, manifold pressure and fuel supply at minimum starting torque, engine speed at start including idle speed and additional requested engine speed at start, and map table values required at engine operation. By applying the air-fuel ratio ignition timing value for from the map table and the like to control the initial engine start through the control of the injector 50 and the ignition coil 60 (S104).

As described above, by detecting the engine speed based on the cranking by the start motor and the N-th cylinder and applying the data thereon, it is detected whether the engine start is normally turned on (S105). The control unit 40 instructs the start-up failure information through the display unit 80 (S108), and when the engine start is normally turned on, the target engine speed is determined according to the change in the coolant temperature and load over time. Next, the idle rotation speed is maintained by adjusting the fuel injection amount and the ignition timing (S106) (S107).

As described above, the present invention forms a tooth on the crankshaft to sense the TDC for each cylinder, and detects the engine speed based on the first sensed TDC of the # N-th cylinder when triggering for initial start-up of the engine. This makes the determination of the ignition timing more stable and improves the engine startability.

In addition, when it is not possible to set the first sensed # N-th cylinder as a reference, the engine speed is detected based on the TDC of the next sensed # N + 1th cylinder to determine the ignition timing.

Claims (4)

An ignition switch for detecting a driver's starting request; A crank angle sensor for detecting a position of the crankshaft; A cam position sensor for detecting a TDC for each cylinder by detecting a tooth formed in the cam shaft; A controller for determining engine rotation by detecting TDC for each cylinder based on the TDC of the #Nth cylinder sensed by the cam position sensor for the first time when the engine is started, and determining a fuel injection amount and an ignition timing for starting the engine; An injector for injecting the calculated fuel amount into each cylinder by opening the nozzle for a predetermined time according to a control signal of the controller; And an ignition coil configured to determine an ignition timing for each cylinder by intermitting the primary coil according to a control signal of the controller. The method of claim 1, Tooth formed on the camshaft engine starting control apparatus, characterized in that the shape of the pulse is divided by each cylinder so as to detect the position of the TDC for each cylinder. Setting the TDC of the #Nth cylinder initially sensed by the cam position sensor as a reference position when triggering by an engine start request; Determining whether a TDC for each cylinder is detected according to triggering; Determining an ignition timing for each cylinder by detecting an engine speed by detecting the TDC for each cylinder; And starting the engine by applying the determined ignition timing for each cylinder. The method of claim 3, If the camshaft rotates abruptly by triggering and the TDC of the first sensed #N cylinder cannot be set as the reference position, the engine speed is detected by setting the TDC of the next sensed # N + 1st cylinder as the reference position. Engine start control method, characterized in that.