JPS6126835A - Cylinder identifying method of multicylinder engine - Google Patents

Abstract

PURPOSE:To test distinctively a multicylinder engine, cylinder by cylinder, by obtaining a cylinder identification signal from the signal of the ignition plug of the 1st cylinder and the pulse signal of the driving torque of a driving motor. CONSTITUTION:A testing engine 2 is rotated by the driving motor 1 and the pluse signal (d) of the driving torque is detected by a pulse signal detecting means 20. This pulse signal (d) and a No.1 pulse (b) as the pulse signal of the ignition plug of the 1st cylinder are sent to each cylinder identification output means 22 of a cylinder signal output device 21. When a 4-cylinder engine 2 is tested, the signal (d) is outputted in the order of the 1st, the 3rd, the 4th, and the 2nd cylinders, so the 1st cylinder is identified with the signal (d) and No.1 pulse (a) and then the 3rd, the 4th, and the 2nd cylinders are identified. Singnals classified by the cylinders are outputted from the output means 22 and the test is taken by using pieces of information classified by the cylinders.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for distinguishing cylinders in a multi-cylinder engine, which is suitable for testing a large number of multi-cylinder engines.

[Prior art]

The conventional method for this kind of discrimination will be explained with reference to FIG.

In the same figure, (1) is the drive motor, (2) is the test multi-cylinder engine, and (4) is the top dead center (hereinafter referred to as TDC) attached to the data center (3). Mark, (5)
is the TDC mark (4) all-detecting pickup, (6)
(7) is a phase detector that detects the phase angle of the crankshaft, such as a rotary encoder, and (7) is a cylinder-specific signal output device that outputs cylinder-specific signals based on various signals.

Next, the operation will be explained.

The drive motor (1) rotates the crankshaft of the test engine (2). TDC mark at that time (
4) is detected by the pickup (5), and this detection signal a'f is the signal b (ffi1 stage (8 )
distinguishes Nagi 1 cylinder. Next, the engine (2) is controlled by the rotary encoder (6) attached to the motor (1).
) and sends the detection signal c to the signal output device (7) for each cylinder.

After the Nagi 1 cylinder is distinguished, the other cylinders are distinguished by the cylinder discrimination output means (9) based on the discrimination output of the Nagi 1 cylinder and the phase angle of the crankshaft. outputs a signal for each cylinder.

Since the conventional cylinder differentiation method is performed as described above, it is necessary to attach a TDC mark to each test engine, and therefore, attaching this TDC mark requires a great deal of time and effort for adjustment. I had to.

[Summary of the invention]

This invention was made in order to eliminate all the drawbacks of the conventional method as described above, and instead of using the l' DC mark mentioned above, each cylinder is identified from the 1 pulse and pulsating signals such as torque. It is an object of the present invention to provide a method for distinguishing between cylinders in a multi-cylinder engine, which allows information on each cylinder to be quickly and easily obtained by distinguishing the cylinders.

[Embodiments of the invention]

Hereinafter, all drawings of an embodiment of the present invention will be described.

FIG. 2 is a schematic configuration diagram of an example of a device applied to the method for distinguishing cylinders of a multi-cylinder engine according to the present invention, and the same parts as in FIG.

In the figure, the drive motor (by υ is a pulsation signal detection means for detecting a pulsation signal d2 such as torque when the test 4-cylinder engine (2) is fully driven, Q]) is a cylinder-specific signal output device, It has a cylinder distinguishing output means for sequentially distinguishing the first to fourth cylinders from the above-mentioned first pulse b and the above-mentioned pulsation signal d and outputting a signal.

Next, the operation of the above configuration will be explained.

The drive motor (υ) rotates the test engine (2) fully.The pulsation signal d of the drive torque at this time is detected by the pulsation signal detection means (a).This pulsation signal d and the engine (2) Calm 1 pulse b, which is a valve signal of the spark plug of the first cylinder, is sent to each cylinder distinguishing output means 4 of the cylinder specific signal output device e1).

In the case of a four-cylinder engine (2), the torque pulsation signal d is output in the order of the first cylinder, the third cylinder, the fourth cylinder, and the second cylinder as shown in FIG. Therefore, this pulsating signal d and calm 1
According to pulse a, first, the first cylinder is distinguished. and,
Subsequently, the Nxh 3 , Na 4 , and Nch 2 cylinders are sequentially distinguished, and signals for each cylinder are outputted from the cylinder discrimination output means (a). That is, by doing this, there is no need to take a TDC mark for each test engine as in the past, which saves time and effort, and it is possible to obtain cylinder-specific signals as information without using a phase detector.

〔Effect of the invention〕

As described above, according to the present invention, each cylinder is distinguished from the affected pulse and pulsating signals such as torque, which saves a lot of time and effort in attaching the TDC mark, and also eliminates the need for a phase detector. 9. It has the effect of being able to obtain cylinder-specific information easily and at low cost.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a device applied to a conventional method for distinguishing cylinders in a multi-cylinder engine, and FIG. 2 is a schematic diagram illustrating an example of a device applied to a method for distinguishing cylinders in a multi-cylinder engine according to the present invention. , FIG. 3 is an explanatory diagram of the output order of pulsating signals. (1)...Drive motor, (2)...Multi-cylinder engine for testing, Kan...Pulsation signal detection means, υ...Cylinder-specific signal output device, (A)...Each cylinder distinction output means,
b...Signal of the spark plug of the first cylinder (magnetic 1
pulse), d... pulsating signal. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] (1) A cylinder-specific signal is obtained from the signal of the stop plug of the first cylinder in the multi-cylinder engine used for the test and the pulsation signal of torque etc. when the engine is rotationally driven by the drive motor. A method for distinguishing cylinders in a multi-cylinder engine.