JP2579185Y2 - Electronically controlled engine test equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronically controlled engine test apparatus for performing a test operation of an electronically controlled engine by itself to determine the type of the engine and operate the engine.

[0002]

2. Description of the Related Art Conventionally, electronically controlled engines such as automobiles are operated by controlling ignition timing, fuel injection timing, and the like at predetermined timings by a control device. This control device detects the position of the piston from the rotation angle of the crankshaft (hereinafter, this angle is referred to as the crank angle), and when the piston position reaches a predetermined ignition timing and fuel injection timing, the ignition device And the fuel injection device outputs an ignition signal and a fuel injection signal, respectively.

A crank angle sensor has been used to detect the crank angle. The crank angle sensor has a structure for detecting, for example, the rotational position of a camshaft, and outputs a top dead center detection signal to the control device when the camshaft rotates to a position where the piston reaches a compression top dead center. Along with
Each time the camshaft rotates by a certain angle, a unit angle detection signal is output to the control device. That is, the control device integrates the number of input unit angle detection signals after the top dead center detection signal is input, and outputs the ignition signal when the next ignition timing (several degrees before the top dead center) is reached. Will be.

As the crank angle sensor, besides outputting two kinds of signals as described above, a sensor outputting only a single ignition timing detection signal or a sensor used for an engine having a large number of cylinders is used. Some output three or more signals. Any of the crank angle sensors is configured to be able to detect the piston position from a signal pattern of a top dead center detection signal or a unit angle detection signal (hereinafter, these signals are simply referred to as crank angle signals) output. I was

[0005] The control method of the above-described control device differs for each engine. Even if the control method is different, there is no particular problem when the engine is mounted on the vehicle. When dismantling a car and buying and selling only its engine as a used engine, it must test whether the engine works properly, but the existence of those control devices at that time was causing troublesome problems . That is,
As described above, since the engine is structured to be ignited by the control device, even when testing the engine alone, it cannot be confirmed whether or not the engine operates properly without the control device for the engine. Therefore, in the past, it was necessary to prepare all the control devices of each model when dealing with used engines. However, the number of automobile models has increased, and the control devices for the engines have been different depending on the models even by the same manufacturer.Preparing the control devices for all the engines has become extremely troublesome. I have. for that reason,
At present, used engines are traded without any tests. Needless to say that is not desirable

[0006]

Therefore, there has been a demand for an engine which can determine the type of a single engine and can perform an operation test on all types of engines with a single device. The present invention aims to achieve that.

[0007]

An electronic control type according to the present invention.
Engine test equipment is output from the crank angle sensor
Electronic control that determines ignition timing in response to crank angle signal
Connected to the crank angle sensor of the engine
It is produced by rotating the crankshaft by a motor.
Signal detecting means for detecting the signal pattern of Jill the crank angle signal, storing the signal pattern for each engine model
Storage means and the model for each model stored in this storage means.
The signal detection means is selected from the signal pattern of the crank angle signal.
The signal pattern detected by the stage is searched, and the model selecting means for specifying the model of the engine and the model selecting means specify
The engine ignition timing and fuel injection timing
Control signals to the ignition and fuel injectors
Control means for operating the engine .

[0008]

According to the electronically controlled engine test apparatus of the present invention, the engine type is automatically selected by rotating the crankshaft of the engine to be tested and outputting the crank angle signal from the crank angle sensor. , The engine can be operated .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a block diagram showing a state in which the test apparatus according to the present invention is connected to an electronically controlled engine.
FIG. 2 is a block diagram showing a configuration of a test apparatus according to the present invention. FIG. 3 is a diagram showing a signal pattern of a crank angle signal, and FIG. 4 is a diagram showing another example of a signal pattern of a crank angle signal. These drawings show an output state when the crankshaft makes one rotation. FIG. 5 is a flowchart for explaining the operation of the test apparatus according to the present invention.

In these figures, reference numeral 1 denotes an electronically controlled engine, and this engine 1 is of a four-cycle, four-cylinder type in which cylinders are arranged in a line. 2 is this engine 1
Reference numeral 3 denotes a spark plug, and 4 denotes an injector as a fuel injection device. The spark plug 3 and the injector 4 are provided for each cylinder. Reference numeral 5 denotes an ignition coil unit. The ignition coil unit 5 is connected to an ignition plug 3 corresponding to an ignition timing among the four ignition plugs 3 based on the ignition signal when an ignition signal is input from a model discriminating device described later. It is configured to apply a high voltage.

Reference numeral 6 denotes a crank angle sensor which is connected to a camshaft (not shown) of the engine 1 and detects a crank angle from a rotation angle of the camshaft. The crank angle sensor 6 is configured to output two types of signals a and b, as shown in FIG. 3 or FIG. Signal a indicates a unit angle detection signal that is output each time the camshaft rotates by a certain angle,
Signal b indicates a top dead center detection signal that is output when the cam shaft rotates to a position where the piston reaches the compression top dead center. In addition, as the crank angle sensor, in addition to the two types of the crank angle signal being output, there is also a sensor that outputs only one type of signal as shown in FIG. is there.

Reference numeral 7 denotes a device type determination device . In the present embodiment, the model discriminating device 7 discriminates the model of the engine 1 and outputs an ignition signal and a fuel injection signal at an optimum timing of the engine 1 so that the engine 1 can be operated. I have. As shown in FIG. 2, the discriminating device 7 includes a CPU 8 for performing various calculations in performing model discrimination and engine control, a waveform shaping unit 10 for transmitting a crank angle signal from the crank angle sensor 6 to the CPU 8, and an input buffer. 9, an output buffer 11 for outputting an ignition signal and a fuel injection signal from the CPU 8 to the ignition coil unit 5 and the injector 4, and a RAM 1 for storing an input order of signals input from the crank angle sensor 6 and the like.
2 and a ROM 13 in which ignition timing and fuel injection timing for each engine model are stored in advance.

The waveform shaping section 10 has two signal input terminals, input 1 and input 2.
The signal a shown in FIG. 4 is input to the crank angle sensor 6 so that the signal b is input to the input 2 terminal.

The RAM 12 has a structure for storing signals input to the input 1 and input 2 terminals in the order of input. Further, the ROM 13 stores an ignition timing map, a fuel injection timing map, and the like for each engine model. The ignition timing map is configured so that the pattern of the crank angle signal (the order of input signals from the crank angle sensor for each engine) can be determined. This pattern is such that when signal a is input 1 and signal b is input 2 in FIG. 3, input 1, input 2, input 1, input 1, input 1, input 1, and input 1 are performed.

The CPU 8 includes a signal detecting means 14 for detecting a signal pattern of a crank angle signal output from the crank angle sensor 6, and a model for specifying a model of the engine 1 based on the signal pattern detected by the signal detecting means 14. Selection means 15 and control means 16 for controlling operation of engine 1
It is composed of The signal detection means 14 is configured to store the input order of the signals input to the input 1 terminal and the input 2 terminal in the RAM 12 and detect the signal pattern of the crank angle signal. In this embodiment, for example, the rising edge of a pulse of an input signal is detected, and the input 1 and the input 2 are stored in the RAM 12 in the input order.

The model selecting means 15 compares the signal input sequence (the signal pattern of the crank angle signal output by the crank angle sensor 6) stored in the RAM 12 with the data stored in the ROM 13 (the signal pattern of the crank angle signal for each model). It is configured to compare and select models that have the same signal input order.

The control means 16 comprises the model selection means 1
5 controls the ignition coil unit 5 and the injector 4 of the engine 1 based on the ignition timing map and the fuel injection timing map of the model identified by the control signal (ignition signal, fuel injection signal).
No.) is output. When the control means 16 detects the crank angle, a crank angle signal output from the crank angle sensor 6 is used.

Next, the model identification configured as described above is performed.
The operation of the device 7 will be described with reference to the flowchart shown in FIG. Model
In starting the engine 1 using the discriminating device 7 , the input 1 terminal and the input 2 terminal are connected to the crank angle sensor 6
And the output coil 11 is connected to the ignition coil unit 5 and the injector 4. Further, an injector 4, an ignition coil unit 5, a crank angle sensor 6
A power source (not shown) is connected to the model discriminating device 7 and the like, and fuel is supplied to the injector 4 by a fuel supply device (not shown).

[0019] Initial After conditioning the start preparation in this manner, when ON operation of the main switch example of model determination unit 7 (not shown), CPU 8 as shown in step S ₁ in FIG. 5 is a recording area of the RAM12 Become After initialization, as shown in step S ₂ and S _3, CPU 8 sequentially judges whether or not a signal to the input 1 terminal or the input 2 terminal is input. Since the crank shaft 2 is not a signal input from the crank angle sensor 6 and earlier to be rotated, it will follow the loop consisting of steps S ₂ to S ₃ in this case.

Next, for example, a starter motor (not shown)
And the crankshaft 2 of the engine 1 is rotated. By doing so, the camshaft rotates together with the crankshaft 2,
The rotation position is detected by the crank angle sensor 6. When the signal is input to the first input 1 terminal, it is determined that the input 1 is input in step S ₂ CPU 8 is the input at step S ₄ 1 a ( "1") R
AM12 to be stored as the first input sequence, searching for a pattern of the signal at step S ₅ from the stored data of the ROM 13. At this time, when the same signal pattern and the signal pattern input does not exist in the stored data of the ROM13, the process returns to step S _2.

[0021] After returning to step S _2, the next time signal to the input 2 terminal is input, CPU 8 proceeds from step S ₃ to step S _6, stored as a second input order of "2" to the RAM12 is allowed to again find the pattern of the input signal at step S ₅ from the stored data of ROM13 far. If the same signal pattern as the input signal pattern does not exist in the stored data of the ROM13 returns to step S ₂ as described above, when the same signal pattern is present, the process proceeds to step S ₇ signal The model whose pattern matches is stored in the RAM 12.

That is, assuming that the crank angle sensor 6 has a structure for outputting a crank angle signal with a signal pattern as shown in FIG. 3, after input 1 and input 2 are sequentially input, input 1 is continuously performed 5 times. Step S ₅ after input
The model is specified by. When the crank angle sensor 6 has a structure that outputs a crank angle signal with a signal pattern as shown in FIG. 4, the input signals are input 1, input 2, input 1, input 1, input 2, and input 1. After that, the model is specified.

[0023] After discriminating the model of the engine 1 in this way, to start the engine 1 proceeds to step S _8. At this time, the CPU 8 outputs an ignition signal to the ignition coil unit 5 based on the ignition timing map and the fuel injection timing map stored in the ROM 13,
To output a fuel injection signal. Note that the ignition signal and the fuel injection signal are output so that the cylinder in which the piston is located is ignited at the ignition timing / fuel injection timing. Then, the engine 1 is started by all four cylinders being sequentially ignited.

Therefore, by turning the crankshaft 2 of the engine 1 to be tested and causing the crank angle sensor 6 to output a crank angle signal, the model of the engine 1 is automatically selected, and this engine 1 The operation is performed with the timing and the fuel injection timing.

In the above-described embodiment, the case where the crank angle sensor for outputting two kinds of crank angle signals is attached is described. By providing terminals and four input terminals to detect the signal input order,
As described above, the model of the engine can be determined.

Further, in the above-described embodiment, an example in which the signal generation order of the crank angle signal output from the crank angle sensor is set to a signal pattern has been described. However, as shown in FIG. Uses the signal interval to determine the model.

FIG. 6 is a diagram showing a signal pattern when there is only one kind of crank angle signal. FIG. 1A shows a case where the crank angle signal is output at a constant interval, and FIG.
Indicates a case where the crank angle signal is output irregularly. As described above, when there is only one kind of crank angle signal, (1) the ratio between the signal interval (time) indicated by c in the figure and the signal interval (time) indicated by d or (2) e in the figure The model is determined by calculating the ratio between the signal interval (time) indicated by the symbol and the signal interval (time) indicated by the symbol f .

That is, the ratio of the signal intervals is stored in advance for each model of the engine, and the model of the engine is specified by searching the actually measured ratio from the stored data. Even in such a configuration, it is possible to automatically determine the model of the engine to be trial-run and perform the test by operating the engine, similarly to the above embodiment.

Further, in this embodiment, an example is shown in which the model discriminating apparatus itself has a function of controlling the operation of the engine. However, the present invention is not limited to such a limitation.
A control device for sending an ignition signal and a fuel injection signal to the ignition coil unit and the injector may be provided separately. In particular, as shown in the present embodiment, if the same device is provided with the model discrimination function and the engine control function, the device can be formed compact and the handling is easy.

[0030]

As described above, the electronically controlled engine test apparatus according to the present invention outputs the signal from the crank angle sensor.
The ignition timing is determined according to the crank angle signal
Connected to the crank angle sensor of
The crankshaft is rotated by the motor
Signal detection means for detecting a signal pattern of the crank angle signal generated by the engine; and
Storage means for storing, and the model stored in the storage means
From the signal pattern of each crank angle signal.
A model selection unit that searches for a signal pattern detected by the output unit and specifies a model of the engine;
The ignition timing and fuel injection timing of the selected model
Sends control signals to engine ignition and fuel injectors
And control means for operating the engine, so that the engine type is automatically selected by turning the crankshaft of the engine to be tested and outputting the crank angle signal from the crank angle sensor.
An engine having different types of control devices can be started by one device.

Therefore, when test-running the engine in a single state to which the control device is not connected, for example, when replacing the engine, the type of the engine can be determined very easily. In particular, an engine control device in which the ignition timing and the fuel injection timing of each model are stored for many models is connected to the model determination device according to the present invention, and the model is determined based on the data stored in the control device. With this configuration, one engine can start many types of engines without performing any type selection operation. Therefore, it is not necessary to prepare an engine control device for each model.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a state in which an electronically controlled engine test apparatus according to the present invention is connected to an electronically controlled engine.

FIG. 2 is a block diagram showing a configuration of an electronically controlled engine test apparatus according to the present invention.

FIG. 3 is a diagram showing a signal pattern of a crank angle signal.

FIG. 4 is a diagram illustrating another example of a signal pattern of a crank angle signal.

FIG. 5 is a flowchart illustrating an operation of the electronically controlled engine test apparatus according to the present invention.

FIG. 6 is a diagram showing a signal pattern when there is one type of crank angle signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine 2 Crankshaft 3 Spark plug 4 Injector 5 Ignition coil unit 6 Crank angle sensor 7 Model discriminating device 8 CPU 13 ROM 14 Signal detection means 15 Model selection means

Claims (1)

(57) [Scope of request for utility model registration] 1. A starter motor connected to a crank angle sensor of an electronically controlled engine whose ignition timing is determined in accordance with a crank angle signal output from the crank angle sensor.
Signal detecting means for detecting a signal pattern of the crank angle signal generated by rotating the crankshaft, and the signal pattern is stored for each engine model.
Storage means and a model-specific clan stored in the storage means.
The signal detection means detects from the signal pattern of the angle signal.
Model selection means for searching the output signal pattern and specifying the model of the engine;
The engine has different ignition timings and fuel injection timings.
Before sending control signals to the ignition device and fuel injection device
An electronically controlled engine test apparatus comprising: a control unit for operating the engine.