SU1486845A1 - Method of evaluating irregularity degree of rotation rate of internal combustion engine - Google Patents

Description

The invention relates to the diagnosis of internal combustion engines. The aim of the invention is to improve the accuracy of determining the degree of non-uniformity of the speed controller (RFV) engine. The goal is achieved by estimating the degree of Irregularity RFI produced by the maximum angular acceleration of the motor shaft during the free acceleration of the engine to the maximum speed at idle, carried out by shifting to the position of the maximum feed of the fuel delivery body and delay it in this position before the start of the RFI . 3 il.

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The invention relates to the diagnosis of internal combustion engines (ICE), in particular to the assessment of the technical condition of the rotational speed controllers (RFV) of the motor shaft, and can be used to determine the degree of non-uniformity of RFI ICE.

The aim of the invention is to improve the accuracy of determining the degree of unevenness RFV engine.

FIG. 1 shows a diagram of the device that implements the method; in fig. 2 - time dependence of the angular acceleration with free acceleration of the internal combustion engine; in fig. 3 - experimental dependence of the degree of irregularity δ RFI on the magnitude of the maximum angular acceleration ε of the motor shaft.

The device includes a sensor 1 of the rotational speed of the crankshaft of the internal combustion engine, the output of which through the driver 2 and the converter 3 is connected to the inputs of the threshold element 4 and the first differentiation unit 5. The first output of block 5 through the second differentiation unit 6 and the null organ 7 is connected to the first installation input of trigger 8, the second installation input of which is connected to the output of threshold element 4. The output of trigger 8 is connected to the control input of key 9, the signal input of which is connected to the second output block 5, and the output of the key 9 through the memory block 10 is associated with the indicator 11.

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The method is implemented as follows.

Preliminary on the test bench, determine the degree of non-uniformity of RFI. Install RFC on the engine, start the engine and carry out its free acceleration to the maximum shaft speed at idle mode by quickly moving the control lever

1486845

feed to the maximum fuel position.

In this case, the pulses produced by the speed sensor 1, through the driver 2, are fed to the input of the converter 3, at the output of which an analog signal is generated, the value of which is proportional to the pulse frequency of sensor 1. When the shaft speed reaches the nominal value, the output of the threshold element 4 is the trigger 8 and the opening key 9. The signal from the first differentiation unit 5 is fed to the input of the memory unit 10. At the moment when the second derivative of the rotation frequency equals zero, a signal appears at the output of the nullorgan 7, which returns the trigger 8 to the initial state. When this key 9 is locked, and in block 10 and on the indicator 11 is fixed the value corresponding to the maximum negative angular acceleration.

By positioning the RFI engine with a certain degree of irregularity, the dependencies shown in FIG. 3

Next, the RFE to be tested is installed on the engine, the maximum negative angular acceleration of the shaft is determined during the test and according to the dependence shown in FIG. 3, determine the degree of irregularity of the regulator.

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Claims (1)

Claim The method of estimating the degree of unevenness of the rotational speed controller of the internal combustion engine, which consists in installing a speed controller on the engine, starting the engine, by quickly moving the fuel control lever, accelerating the engine to the maximum engine speed at idle speed, measuring angular acceleration of the motor shaft, characterized in that, in order to improve the accuracy of determining the degree of irregularity of the regulator, previously determined share the degree of irregularity of the regulator as a function of the maximum negative angular acceleration by installing rotation speed regulators on the engine with the degree of irregularity established as a result of bench tests, and during the tests they hold the fuel control in the maximum feed position until the engine accelerates, they fix the maximum negative values of the angular acceleration of the motor shaft and the predetermined dependencies of the ste Penalties for non-uniformity of the motor shaft speed regulator on the magnitude of the maximum negative angular acceleration determine the degree of unevenness of the controller being tested. Phage.1 1486845 FIG g