SU992793A1 - Apparatus for monitoring parameters of motor vehicles i.c. engine - Google Patents

Description

The invention relates to automotive diagnostic equipment and can be used to monitor the ignition advance angle (PFD), the closed contact angle of the distributor distributor (RCD) of the internal combustion engine (two), and the number of revolutions. crankshaft two, - four, six and eight cylinder two.

Devices are known for monitoring the parameters of an automobile internal combustion engine, comprising ignition pulse sensors, crankshaft rotation angle of an internal combustion engine (two) / top dead center (TDC) marks, a unit for measuring measurement pulses with advanced ignition angle parameters (PFL) and angle charts ignition lag (USZ), the recording device and the unit converting the measuring pulses into the angle of rotation of the crankshaft of the internal combustion engine, containing a pulse generator of increased stability nosti, wherein the measuring pulses isolation unit is connected with sensors and with measuring pulses converting unit in the rotation angle of the crankshaft engine. which is associated with a recording device 1.

The known devices are designed to measure POS and PZS and do not allow measurement of PECS and asynchronism, moreover, with their help, it is impossible to simultaneously measure the rotational speed of the engine shaft and the POP or PZA parameter. The known devices do not allow the generator to automatically adjust the frequency of the generator pulses, depending on the speed of the crankshaft engine, i.e. additional frequency calibration is required. .

15

The purpose of the invention is to expand the operational capabilities of the device by measuring the UZSK, asynchronism and simultaneously measuring the speed of the engine crankshaft and one

20 of the parameters: UZSK, UOZ or UZZ.

This goal is achieved by the fact that the measuring pulses extraction unit is equipped with a pulse angle isolation circuit

25 contacts (UZSK) and a switching selector connected in series with the UZSK, UOS and UZZ control circuits, the unit converting the measuring pulses into the angle of rotation of the crankshaft of the internal combustion engine is equipped with an automatic count of the number of revolutions of the crankshaft of the internal combustion engine having two chains, one of the KOTOfftJx is connected to a com- pactary selector, and a friend with a sensor for the angle of rotation of the crankshaft. The device can be equipped with an input protection unit 3, having galvanic isolation of the input and output circuits and an impulse meter connected between the sensors and the extraction unit. . The device can be equipped with a unit for controlling the speed of the cranked shaft of the internal combustion engine, which are connected by inputs to the generator and to the sensor of the crankshaft angle of rotation of the TDC mark, and the output to the recording device. The device can also be equipped with two memory elements, one of which is connected to the registering device with a unit for converting measuring pulses to the angle of rotation of the engine crankshaft, and the other to the registering device to the unit for controlling the number of revolutions of the crankshaft. In addition, the recording system can be made in the form of a worldwide multi-indicator. The schematic diagram of the device is shown in the drawing. A device for monitoring the parameters of an automobile internal combustion engine contains a sensor 1 for ignition pulses, a sensor 2 for the rotational angle of the engine crankshaft located in the teeth zone of the crankshaft flywheel, a sensor for TDC marks, an input protection unit 4 connected to the inputs 5 with the output of sensor 1, wire 6 with the output of sensor 2 and wire 7 with the output of sensor 3. In the case where a transistor-contact or contactless ignition system is used in the checked internal combustion engine, wire 7 is connected to the output of the transistor switch, for example TK-102 , TK-200, TK-108 (not shown). In addition, the proposed device contains a measuring pulse extraction unit 8, which is equipped with a UZSK pulse extraction circuit 9 and an eight-channel switching selector 10 and is connected to the inputs 11-13 through the input protection unit 4 responsibly with ignition pulse sensors 1, 2 angles of rotation of the engine crankshaft , 3 marks TDC, and its output is connected to the block 14 converting the measuring pulses into the angle of rotation of the crankshaft of the internal combustion engine, having a generator of 15 pulses of increased stability, the circuit 16 automatically taking into account the number of of the rotations of the crank shaft of the internal combustion engine and connected by one output to the memory element 17, the output of which is connected to a seven-bit recording device 18. Another output from the conversion pulse measuring unit 14 is connected to the input 19 of the engine speed control unit 20, its other two inputs 21 and 22 are connected through the input unit 4 with the sensor 2 of the angle of rotation and with the sensor 3 marks TDC. The output of the unit 20 is connected to the memory element 23, which in turn is connected to the recording device 18.;. The device works as follows. The signals from sensors 1-3 are fed to the inputs of block 4. Block 4 contains galvanic isolations of input and output circuits (not shown), which allows to have an unlimited length of wires, 5-7, i.e. It provides interference suppression at the output of this unit. Next, the signals on the inputs 11-13 are received in block 8, which provides for the formation of measuring pulses, the duration of which is proportional to the parameters of the CPD, SPD and UZSK. Yelok 8 has an eight-channel switching selector 10, which makes it possible to determine the parameters for each Qi-Lindr of two, four J-six and eight-cylinder internal combustion engines. Having the ability to check the UZSK parameter for each cylinder allows you to control the asynchronism of the ignition system. Formed by the duration of the pulses from the output of the selector 10 of the block 8 is fed to the input of the block 14. At the same time, the input of the block 14 receives a signal through the block 4 from the sensor 2. The block 14 converts these measuring pulses into the angle of rotation of the engine crankshaft. In this case, the automatic counting of the speed is provided. Block 14 contains a generator of 15 pulses of increased stability, which is used for operation of block 14 and block 20. In order to ensure the readability of the results of converting the duration into an angle of rotation at low revolutions of the engine shaft (60200 rpm), memory element 17 is used , which provides a non-light indication of the parameters of the CPP, SPD or UZSK. Information from the memory element 17 is fed to a seven-bit device 18. Parameter values. A PUS, USZ or UZSK is indicated by the three first bits of a digital indicator. The pulses through the block 4 of the sensors 2 and 3 are fed to the inputs 22 and 23 of the block 20, the output 19 of which receives pulses from the generator 15. block 14. Using the received signals, the block 20 provides a measurement of the number

speed crankshaft engine. To provide ease of reading results at low revolutions of the shaft, a memory element 23 is used which provides a non-flashing indication of the revolutions. Information from the memory element 23 is fed to the recording device 18. The number of revolutions of the crankshaft of the internal combustion engine is indicated by the last four bits of the indicator.

Claims (5)

1. A device for monitoring a para- 15 meter of an internal combustion engine containing sensors of ignition pulses, crankshaft angle of internal combustion engine, marks of the top 20 dead center, measuring pulses extraction unit with diagrams of control of ignition angle parameters and ignition lag angle, recording The device and the unit 25 converting the measuring pulses into the angle of rotation of the crankshaft of the internal combustion engine, comprising a pulse generator with increased stability, the unit for allocating the lazy measuring pulses is connected to the sensors and to the unit for converting the measuring pulses to the angle of rotation of the crankshaft of the internal combustion engine, which is connected with a recording device, characterized in that, in order to expand the operational capabilities, the unit for measuring The pulses are equipped with a pulse separation angle circuit of a closed contact state and a switching selectorrm connected by a sequence. but with schemes for controlling the angle of the closed state of the contacts, the advance angle of ignition and the angle of delay 45 ignition unit, conversion of pulse signals to the angle of rotation of the crankshaft of the internal combustion engine is equipped with an automatic counting of the crankshaft rotational speed of the internal combustion engine, which has two circuits, one of which is connected to the switching selector, and the other is connected to an angle angle sensor of the crankshaft. 2. The device according to claim 1, which is equipped with an input protection unit having galvanic disconnects from the main and output circuits and connected between the sensors and the selection unit of measuring pulses. 3. The device according to claim 1, which is equipped with a crankshaft speed control unit for an internal combustion engine, connected by an input to the generator and to the crankshaft angle sensors and the top dead center, and the output to the recording device, 4. Device on PP. 1 n 3, about the first of which is provided with two memory elements, one of which is connected to the registry of the device with a transformer for converting measuring pulses into the angle of rotation of the crankshaft of an internal engine, and the other in connection with the registering device, with the crankshaft speed control unit. 5. The device according to claim 1, characterized in that the recording device is made in the form of a seven-digit indicator. Sources of information taken into account in the examination 1. USSR author's certificate 438286, cl. G 01 M 17/00, 1971.