SU797066A1 - Digital device for measuring parameters of internal combustion engines - Google Patents

Description

mutating keys, analog sensors (current, potential, resistive which, via switching keys, are controlled by a channel switch, are connected to a measuring transducer, the output of which is connected to the linearizer of sensor characteristics and connected simultaneously with the output register with indication and tolerance control device, and the control bus nodes are connected to the outputs of the software device.

The drawback of the device is that it is designed to work only with analog sensors, the accuracy of the device is limited by the linearization characteristics of the sensors, since with the linearization method used, an increase in accuracy greatly complicates the design of the linearizer, and, moreover, there is no possibility of determining engine characteristics that cannot be directly measured.

The purpose of the invention is to improve the accuracy by applying automatic correction of the errors of the measuring transducer and improving the linearization of the sensors, expanding the class of measured parameters, which consists in determining directly in the measurement cycle of engine characteristics that cannot be directly measured (for example, effective power, torque, average effective pressure, air excess factor, etc.).

The goal is achieved by the fact that a digital device for measuring the parameters of an O1B internal combustion engine, contains analog sensors connected via switching keys to the measuring transducer, a channel switch whose outputs are connected to the control inputs of the switching keys, a software device, an output register and a tolerance indicator control, additionally introduced operational memorization device, arithmetic device, permanent memory and device and discrete data ticks, which are connected via switching keys to the information inputs of the first, second and third valves, to which the output of the measuring converter is simultaneously connected, while the output of the first, valve is connected to the output register, the control inputs of the valves are connected to the first, second, the third and fourth output buses of the program device; the second, third, and fourth output buses of the program device are connected to the control inputs of the random access memory.

the fifth is with a control bus of memory and arithmetic devices, a pole with a control bus of a channel changer, and a seventh with a control bus of a measuring converter. The information input of the arithmetic unit is connected to the outputs of the permanent and operative storage devices. The outputs of the second, third and fourth valves are connected to the input of the latter, the information input of the fourth valve is connected to the output of the arithmetic unit connected to the tolerance control indicator and the output register ..

The drawing shows a functional diagram of a digital device for measuring parameters of internal combustion engines.

The device consists of analog 1 and discrete} with 2 sensors of switching keys 3, measuring transducer 4, switch 5 channels, first 6, second 7, third 8 and fourth .9 gates, program device 10, random access memory ± va 11, arithmetic unit 12, a persistent storage device 13, an output register 14, a control tolerance indicator 15

The operation of the device is as follows.

The measured parameters are perceived by sensors 1 and 2. Discrete sensors 2 are connected to the inputs of one of the three valves 6,7 and 8 via switching, the keys 3 directly, and analog sensors 1 through switching keys 3 and the measuring converter 4, which is the simplest linear analog-code converter. Switching switches are switched by 5 channels.

All sensors, both analog and discrete, are broken; into three groups.

Sensors whose statistical characteristics do not need to be linearized, and their output signals are subject only to registration. Signals from these sensors pass through the first valve b.

Sensors whose statistical characteristics do not need to be linearized. But are involved in the express processing, i.e., the calculation of those engine characteristics that cannot be directly measured. The signals from these sensors pass through the second valve 7.

Sensors whose statistical characteristics need linearization, the signals from these sensors pass through the third valve 8. This group of sensors is divided into two subgroups: sensors, output signals

The sensors are only recorded in output register 14 with an indication of j sensors, the output signals of which are recorded and must be memorized for express processing.

The division into subgroups is performed using the fourth valve 9, through which the output of the arithmetic unit 12 is connected to the input of the operational storage device 11, the fourth is controlled by the valve 9 from the fourth bus of the program device 10. The fourth valve 9 opens only when the arithmetic unit 12 processes the signals from the respective sensors group 2 and the second subgroup 1

The signals from the sensors of the first group, in the form of a code, enter the output register, which can be provided with an indication. The signals from the sensors of the second group are stored at specific addresses in the random access memory 11, from where they are transferred to the registers of the arithmetic unit 12 for carrying out the corresponding operations to determine characteristics that are not measurable; at the same time, they are output to the output register 14. These signals are stored in a random access memory 11 for one measurement cycle. For sensors of the third group, if the signals after linearization are only recorded, the information entering the random access memory 11 is transferred to the arithmetic unit 12, where the linearization is performed and then rewritten into the output register 14. The corresponding information in the random access memory 11 can be erased . If sensor signals other than linearization are used for calculations, then using the fourth valve 9, the linearized value is returned from the arithmetic unit 12 to the operative memory 11 at the same address where it was stored until linearization. The linearized value is also output to the output register 14. When performing computations, information from the random access memory 11 is transferred to the arithmetic unit 12, where it is processed. The result is recorded in the output register 14. The storage of information in the operational storage device 11 is designed for v; one measurement cycle.

In the arithmetic unit 12, a tolerance control is also performed, during which the measured (or calculated) value is compared with the maximum permissible values that are stored in the fixed memory 13. The result of the comparison is displayed on the tolerance control indicator 15.

The process of automatic correction of the measuring transducer consists in that with the help of auxiliary measurements in the arithmetic unit the additive and multiplicative errors of the transducer are calculated, and then the correction is made to the measurement results. Auxiliary measurements

once per measurement cycle.

In the prototype device, a separate device — a voltmeter — is used as a measuring transducer, it has a complex internal structure, and a simple analog-to-code converter, whose conversion function is linear, can be used in the proposed device.

The linearization process is

calculating the inverse function for the sensor conversion function, which with a high degree of accuracy is described by equations of order not higher than the third for the overwhelming majority

sensors. Finding a solution to such an equation is straightforward from the point of view of technical implementation, and this solution is more accurate than the linearization method.

piecewise linear approximation.

The arithmetic unit, operative and read-only memory can be used to calculate the characteristics

engine, which cannot be directly measured, i.e., an express processing of the information received is performed. For this purpose, depending on the type of engine, a program device is programmed, which is a microprogrammable digital logic device, and a permanent memory in which corresponding constants.

Claims (2)

Invention Formula Digital measuring device parameters of internal combustion engines containing analog sensors connected via switching keys to the transmitter, a kangshov switch, the outputs of which are connected to the control inputs of the commenting keys, a program device, an indicator of the tolerance control, and an output register characterized by the fact that In order to increase the accuracy and expand the class of measured parameters, the device additionally introduces an online backup device, an arithmetic device, a persistent storage device and discrete sensors that are connected to the information inputs of the first / second and third valves to which simultaneously connected: the output of the measuring converter, while the output of the first valve is connected to the output register, the control valve inputs are connected respectively to the first, W the third and fourth output buses of the auxiliary engineering busbars, with the second, third and fourth output buses of the software device simultaneously connected to the control inputs of the random access memory, the PC with the control bus of the permanent memory and the arithmetic devices, the pole with the bus control of the channel switch, / seventh - with the control bus of the measuring transducer,: the information input of the arithmetic unit is connected to the outputs of the persistent storage device and Nogo memorizes tsegs apparatus to an information input of which is connected to the outputs of the second, third and fourth valves, the data input of the fourth gate connected to the output of the arithmetic unit, but simultaneously connected to the indicator and tolerance control output register. , Sources of information, taken into account in the examination 1.Boris Ya.B., Katz B.M., Kazdeki O.A. The system of unified devices for remote counters of the basic parameters of diesel engines, | 11 instruments and control systems, 1968, No. 5. 2. For the UK UK number 1466490, kl.N 3 T, published 1977. D. Digital; SoJartron Compact - 33i i, D.ata Logger Product Data 1972. Catalog, firm Startron Group L i mi ted.