KR100819334B1 - Method for diagnosing starting motor for engine - Google Patents

Abstract

A method of diagnosing a start motor using a scan tool is provided to rapidly diagnosing an error of the start motor by diagnosing an error of a battery based on a battery voltage received in an on-state or a start-state of an ignition key, and then diagnosing the error of the start motor based on a rotational frequency of the engine in a normal battery state. A method of diagnosing a start motor using a scan tool comprises the step of connecting an engine-controlling unit to the scan tool. If a preset start motor diagnose condition and a battery diagnose condition are satisfied, a fuel injection and an ignition are stopped(103). The normalcy of the battery is determined based on a battery voltage received from the scan tool in an on-state or a start-state of an ignition key(114). If the battery represents a normal-state, a rotational frequency of an engine, which is provided from the scan tool and the engine controlling unit, is received for a predetermined time(115). After a predetermined time has lapsed, an error of the start motor is diagnosed and determined based on the rotational frequency of the engine(121).

Description

How to Start Motor Diagnosis Using Scan Tool {METHOD FOR DIAGNOSING STARTING MOTOR FOR ENGINE}

1 is a view showing the configuration of a general start motor drive device.

2 is a flowchart illustrating a start motor diagnosis process using a scan tool according to the present invention.

FIG. 3 is a waveform diagram illustrating an output signal of the scan tool shown in FIG. 2.

The present invention relates to a method for diagnosing a start motor using a scan tool, and more particularly, to a method for quickly performing maintenance on an engine driving start motor.

As shown in FIG. 1, a general vehicle starting device includes a start motor 1, a battery (not shown) for supplying power to the start motor 1, and a circuit for operating the start motor 1. A start relay 3 connecting the start relay 3, a start key switch 4 connecting the start relay 3 when the key (not shown) is started, and the start motor 1 at the P stage or the N stage of the transmission. It comprises an inhibitor switch 5 for transmitting a signal to the microcomputer 6 of the TCU (Transmission Control Unit) at the same time connecting the circuit so that it can be activated.

As shown in Table 1 below, the microcomputer 6 receiving the on / off signal from the inhibitor switch 5 to S1 to S4 is connected to the vehicle through a combination of the four signals. The shift stages P, R, N, D, 2, and 1 are determined.

Thus, when the shift stage determined by the microcomputer 6 is the P stage or the N single stage, the start relay 3 is driven (relay switch on state) so that a current flows in the wiring to the start key.

In such a starting device, the start motor 1 is not one of the important parts of engine starting or a device for diagnosing an error of the start motor. That is, when an error of the starter including the start motor occurs, when the engine is not restarted by restarting the engine after charging or replacing the primary battery, the second start motor 1 is replaced. Therefore, there is a problem that the maintenance time and the maintenance cost increase when an error of the starting device occurs.

An object of the present invention is to solve the problems as described above, to provide a start motor diagnostic method using a scan tool to diagnose the failure of the start motor using a scan tool.

In addition, another object of the present invention is to provide a start motor diagnostic method using a scan tool that can diagnose whether a battery failure using a scan tool.

Technical means according to the present invention for achieving this object,

In a car cranking an engine by supplying a current to a start motor by operating a start key switch,

a) stopping fuel injection and ignition after connecting to the engine control unit and the scan tool and meeting a preset start motor diagnosis and battery diagnosis condition;

b) determining whether the battery is abnormal based on the battery voltage supplied from the scan tool when the start key switch is kept in the ON state and the battery voltage supplied from the scan tool when the start key switch is in the start state. Doing;

c) receiving the engine speed supplied from the scan tool and the engine control unit for a predetermined time when the battery is in a normal state as a result of the determination of step b); And

and d) diagnosing and determining an error of the start motor based on the engine speed received in step c) after the predetermined time elapses.
B),

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b-1) it is determined whether the first battery voltage received when the ignition key switch is in the ON state is within a first predetermined range greater than or equal to a first predetermined value and a second predetermined value. Starting the engine by operating the start key switch to a start state when the battery voltage is within a first predetermined range; And

b-2) receiving the battery voltage supplied from the scan tool and determining whether the received second battery voltage is within the second predetermined range, and determining that the battery is normal if the second battery voltage is within the second predetermined range. Determining,

In addition, b-3) when the first battery voltage does not exist within the first predetermined range in step b-1) and when the first battery voltage does not exist within the second predetermined range in step b-2). Determining at least one case of battery failure and displaying an error message via a scan tool.

On the other hand, step d),

In the step c), if the engine speed received during the predetermined time exceeds a predetermined time, the start motor is determined to be normal, and the determination result is displayed through the scan tool.

In addition, step d)

If the engine speed received during the predetermined time in step c) does not exceed a predetermined number of times, it is determined that the start motor is broken and the determination result is displayed through a scan tool.

According to the present invention, a battery error is diagnosed with respective battery voltages received when the ignition key switch is in an ON state and a start state, and based on the number of engine revolutions received for a predetermined time when the battery is normal as a result of the diagnosis. By diagnosing and determining the error of the start motor, maintenance of the starting device due to the error of the start motor can be performed quickly.

Hereinafter, the most preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention in detail. .

1 is a view showing the configuration of a vehicle to which the present invention is applied, Figure 2 is a flow chart showing the start motor diagnostic process in the ECU and the scan tool of Figure 1, Figure 3 is a waveform showing the output signal of the display module of the scan tool Is also. A start motor diagnosis process of the vehicle will be described with reference to FIGS. 1 to 3.

First, in a vehicle to which the present invention is applied, a scan tool (GST: Serial Scan Tool) is connected to an output side of an engine control unit (ECU).

The GST is a communication protocol for monitoring the ECU in order to monitor the ECU and perform a function such as retrieval of memory data and a fault diagnosis when developing an ECU of a vehicle. The GST includes a display module for displaying a monitoring result or a diagnosis result on a screen.

A process of diagnosing a failure of the start motor of the vehicle by using the scan tool will be described with reference to FIGS. 2 and 3.

First, when the ECU satisfies the conditions for diagnosing the start motor and the battery (101), the ECU generates a signal for stopping fuel injection and ignition (103).

In the above diagnostic condition, the GST is connected to communicate with the ECU, the start relay and other starter parts are normal, the crankshaft position sensor and camshaft position sensor are normal, and the start key switch is ON. The instrument panel of the dashboard is powered when it is maintained, and the calibration data stored in the GST is normal.

Subsequently, the ECU receives the battery voltage supplied from the GST after keeping the start key switch ON.

The ECU determines whether the received battery voltage has a value between a predetermined first voltage 10V and a second voltage 16V (107), and starts the start key switch when the condition is satisfied. After switching to the state (109) and receives the battery voltage supplied from the GST (111).

The ECU determines (113) whether the battery voltage received through the step 111 has a value between the third voltage (7V) and the fourth voltage (13V), and if the determination result satisfies the condition Is determined to be normal (114), and receives the engine speed supplied from the GST (115).

After execution of the step 115, it is determined whether a predetermined time (5 seconds) has elapsed (117), and when a predetermined time has elapsed, it is determined whether the received engine speed exceeds a predetermined time (15 times) ( 119).

When the engine speed exceeds the predetermined number of times, the ECU determines 121 the start motor as normal, and the determination result is displayed through the display module of the GST as shown in FIG.

On the other hand, when the engine speed does not exceed a predetermined number of times through the step 119, the ECU determines that the start motor error (123), and the determination result and the maintenance method are GST as shown in FIG. Is displayed through the display module.

In addition, when the condition of one of the steps 107 and 113 is not satisfied, the ECU determines 125 as a battery error, and the determination result and the maintenance method are shown in the display module of the GST as shown in FIG. 3. Is displayed through.

As described above, the method for diagnosing a start motor of a vehicle according to the present invention diagnoses a battery error with respective battery voltages received when the ignition key switch is in an on state and a start state, and when the battery is normal. By diagnosing and determining the start motor error on the basis of the number of engine revolutions received during the predetermined time, the effect of being able to quickly perform maintenance due to the error of the start motor is obtained.

As such, those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing to the technical spirit or essential features of the present invention. Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive. The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. .

Claims (5)

In a car cranking an engine by supplying a current to a start motor by operating a start key switch, a) stopping fuel injection and ignition after connecting to the engine control unit and the scan tool and meeting a preset start motor diagnosis and battery diagnosis condition; b) determining whether the battery is abnormal based on the battery voltage supplied from the scan tool when the start key switch is kept in the ON state and the battery voltage supplied from the scan tool when the start key switch is in the start state. Doing; c) receiving the engine speed supplied from the scan tool and the engine control unit for a predetermined time when the battery is in a normal state as a result of the determination of step b); And and d) diagnosing and determining an error of the start motor on the basis of the engine speed received in step c) after the predetermined time has elapsed. The method of claim 1, wherein b), b-1) it is determined whether the first battery voltage received when the ignition key switch is in the ON state is within a first predetermined range greater than or equal to a first predetermined value and a second predetermined value. Starting the engine by operating the start key switch to a start state when the battery voltage is within a first predetermined range; And b-2) receiving the battery voltage supplied from the scan tool and determining whether the received second battery voltage is within the second predetermined range, and determining that the battery is normal if the second battery voltage is within the second predetermined range. Start motor diagnostic method using a scan tool comprising the step of determining. 3. The method of claim 2, wherein b-3) the first battery voltage is not within the first predetermined range in step b-1) and the first battery voltage is within the second predetermined range in step b-2). If not one or more of the case of the start-up motor diagnostic method using a scan tool characterized in that it further comprises the step of determining that the battery failure to display an error message through the scan tool. The method of claim 1, wherein the d) step, The start motor diagnosis method using the scan tool, characterized in that the start motor is determined to be normal when the engine speed received during the predetermined time in step c) exceeds the predetermined predetermined time and the determination result is displayed through the scan tool. The method of claim 4, wherein the d) step, When the engine speed received during the predetermined time in step c) does not exceed a predetermined number of times, it is determined that the start motor has failed and the determination result is displayed through a scan tool. .

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