SU993083A1 - Device for determination of internal combustion engine shaft rotation angle - Google Patents

Description

The invention relates to the measurement and technical diagnostics of internal combustion engines and can be used to measure fuel advance or ignition advance angles, to study vibration. characteristics and control mechanisms depending on the angles of rotation of the shaft.

A device is known for determining the angles of rotation of an internal combustion engine shaft, comprising fixed point sensors and test signals, gel driver force, pulse counter, coincidence circuit, switch switches, output pulse drivers, a mixer, and a cathode oscilloscope, with a fixed point sensor through the amplifier-shaper connected to the input of the pulse counter, to the outputs of which are connected in parallel chains of series-connected switch-switches, the circuits coincide and output pulse drivers, the outputs of the coarse are connected in parallel with the oscilloscope and mixer associated with the sensor of the signals under study and with the oscilloscope Cll

A disadvantage of the known device is the necessity of having a gear wheel on the shaft to receive a signal from a shaft angle sensor or a strictly fixed shaft rotation frequency with slight oscillations around this frequency.

The purpose of the invention is accuracy.

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This goal is achieved by the fact that the device additionally contains a circuit AND, a circuit OR, a trigger, a generator of stable pulses, a divider, the first and second counters

15, a memory device, an equivalence circuit, a census signal generator, and a zero meter counter signal generator, with a stable pulse generator connected to the mixer in parallel through the first chain containing a serially connected divider, a circuit, a second counter, and a memory device. in and equivalence scheme, .i through

25, the second chain containing the first counter connected in series, the OR circuit and the first zero setpoint generator, the trigger is output from the amplifier 30 of the imager and connected parallel-BUT to the AND circuit and the census signal generator connected via the zero meter setformers to the second the counter, the input of the drivers of the installation of zero counters is connected to the bogging device, and the output - in parallel with the input of the j OR circuit and the trigger input.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 pulse diagrams.

The device contains a fixed point sensor 1, for example, an upper dead point (TDC) of one of the pistons, a booster amplifier 2, a trigger 3, a generator of 4 stable pulses, a divider 5, circuit b, a census signal generator 7, a zero setting generator 8 and the second counter, the second counter 9, the storage device 10, the scheme. 11 equivalence, first counter 12, OR circuit 13, first zero meter setting driver 14, pulse counter 15, switch switches 16, coincidence circuit 17, output pulse drivers 18, sensor 19 of signals under study, mixer 20 and a recording device 21, for example, a cathode oscilloscope .

The device works as follows.

A fixed-point sensor 1 is connected to the amplifier-driver 2, which is used to form a standard impulse (ip, ...) supplied to the counting input of the trigger 3 and to the zero input input of the counter 15 pulses. The first or second impulse from the amplifier -former 2 after the start of rotation of the shaft, the trigger 3 is set to a position in which it is prohibited to pass it. pulses from the divider 5 through the circuit And 6, and in the counter 15 pulses with each pulse from the amplifier-former 2, the number zero is recorded. When the position of the trigger 3, prohibiting the passage of the signal through the scheme And b, the generator 7 of the census signal receives permission to the census in the storage device 10 the number accumulated in the second counter 9. After that, the signal from the generator 8 sets the zero and first and second carriers to record the second counter 9 and through the circuit OR 13 into the first counter 12 the number zero, as well as setting trigger 3 to the position at which the signal is allowed to pass through the circuit And b. The signals from the generator 4 stable pulse; owls through a divider 5 frequency generator 4 stable pulses with a frequency equal to the frequency of the generator 4 stable pulses (I molded by the division factor of the divider

5 (p) frequency generator 4 stable pulses, received through the circuit And b at the counting input of the second counter 9 and summed in it for the period between two pulses from the sensor 1 fixed point. At each subsequent signal from the sensor 1 fixed point, the sum of pulses / accumulated in the second counter 9, -. rewritten to memory 10, and then the number zero is recorded in the second counter 9. The input of the first counter 12 receives signals from the output of the generator 4 stable pulses, and when the numbers copied to the storage device 10 and the first counter 12 coincide, the output of the equivalence circuit 11 is the pulse that enters the inputs of the counter 15 pulses of the mixer 20 and the former 14 sets the zero of the first counter, the signal from the output of which, through the OR circuit 13, records in the first counter 12 the number zero. During the period between the two signals from the fixed-point sensor 1, the sum in the jamming device 10 and in the first counter -12 coincides, n times, and at the output of the equivalence circuit 11, at regular intervals (fg), signals appear that are fed to the counting input of the counter 15 pulses . When the sum of the signals in the pulse counter 15 coincides with the numbers dialed on the switch switches 16, the output of the matching circuit 17 is a signal whose duration is equal to the duration between two adjacent signals to the count input of the counter 15 pulses from the output of the equivalence circuit 11 . These signals are input to the output pulse drivers 18, converted into pulses of desired duration and amplitude, and output to an external connector for control circuits and to mixer 20 for viewing on an oscilloscope screen.

The inputs of the mixer 20 receive pulses from the output of the equivalence circuit 11, the sensor 19 of the signals under study and from the drivers of 18 output pulses, which are transmitted without distortion from the output of the mixer 20 to the input of the oscilloscope. The start of the scanning of the cathode ray tube of the oscilloscope is controlled by a signal from one of the drivers of 18 output pulses arriving at the synchronization input oscilloscope.

 To change the intervals between the output pulses from the scheme 11. Equivalence, different values of the division factor n of the divider 5 are set.

The application of the proposed device allows the engine to operate without the presence of a gear wheel on the shaft, to determine the actual values of the fuel advance angles and make recommendations for adjusting the fuel equipment and leveling the load of spacecraft between the cylinders.

Claims (1)

1. USSR Author's Certificate in Application 2786378 / 25-06,. cl. 6 01 M 15/00, 1979.