Arrangement for complex diagnosis of internal combustion engines

• US 4,252,013 A
• Filed: 08/13/1979
• Issued: 02/24/1981
• Est. Priority Date: 09/16/1977
• Status: Expired due to Term

• Current Assignee: Oborovy Podnik Ckd Praha
• Original Assignee: Oborovy Podnik Ckd Praha
• Inventors: Hyanova, Blanka, Sablik, Radko, Janecek, Jan
• Primary Examiner(s): MYRACLE, JERRY
• Application Number:
  US06/065,968
• Time in Patent Office: 561 Days
• Field of Search: 73/116, 73/117.2, 73/117.3, 73/119 A, 364/431
• US Class Current: 73/114.26
• CPC Class Codes: G01M 15/05 by combined monitoring of two or more different engine parameters

Abstract

An arrangement for complex diagnosis of internal combustion engines in the course of their operation comprising a control unit, a measuring unit, an operating unit, an evaluation unit and an indication unit, and a transducer for determining parameters such as pressures, vibrations, emitted supersonic signals and temperatures at different positions of the crankshaft and under various engine operating conditions.

Claims

1. An arrangement for complex diagnostic testing of internal combustion engines comprising a control unit, a measuring unit, an operating unit, an evaluation unit and an indication unit, a pick-up device for sensing the position of the engine crankshaft, pick-up devices for sensing pressures, vibrations, emitted ultrasonic signals and temperatures, the input of the control unit being connected to the pick-up device for sensing the position of the engine crankshaft, input terminals of the measuring unit being connected to the pick-up devices for sensing pressures, vibrations, emitted ultrasonic signals and temperatures, input terminals of the operating unit being connected to output terminals of the control unit and output terminals of the measuring unit, and output terminals of the operating unit being connected to input terminals of the measuring unit, input terminals of the evaluation unit and input terminals of the indication unit.

2. Arrangement as claimed in claim 1 where the control unit comprises a synchronization block with a shaping circuit of synchronizing signals and a pulse generator and a control block with a generator of control pulses and with a locking circuit.

3. Arrangement as claimed in claim 1, where the measuring unit comprises a block for determination of the instantaneous angular speed of the engine crankshaft, a block for working pressure signals with an amplifying circuit, a shaping circuit and a pulse generator, a block for working emitted ultrasonic signals with an amplifier, a shaping circuit and a pulse generator, a block for working of vibration signals with an amplifier circuit, a shaping circuit and a pulse generator and a block for working of signals from the temperature pick-up device.

4. Arrangement as claimed in claim 1 where the evaluation unit comprises a block for storage of instantaneous magnitudes of measured values, a block for performing derivations of the course of supplied values and their storage with a derivation circuit and a memory circuit, a block for determination of distances of characteristic pulses indicated in angular displacements of the engine crankshaft with an integration circuit and a memory circuit, a block for performing integrals of supplied values with an integration circuit and a memory circuit and a block for determination and storage of maximum magnitudes of supplied values with a circuit for determination of maximum magnitudes and with a memory circuit.

5. Arrangement as claimed in claim 1 where the indication unit comprises a block for indication of diagnostic indices, a block for indication of the course of input signals, and a block for indication of generated pulses.

6. Arrangement as claimed in claim 1 where the block for determination of the instantaneous angular speed of the engine crankshaft comprises a voltage controlled oscillator, a counter, a phase detector, and feedback circuits interconnected as a phase synchronization loop.

7. An apparatus as claimed in claim 1, wherein the selected diagnostic signals are picked up at a particular instant and released in the form of diagnostic indices processed in accordance with predetermined algorithms and in a combination predetermined for individual engine types.

8. An apparatus as claimed in claim 1, wherein the amount of fuel injected into the cylinder is indicated on the basis of the course of pressure in the injection line from the numerical value of integral of square root of the pressure signal course in a dependence on time.

9. An apparatus as claimed in claim 1, wherein the time of fuel supply into the cylinder is indicated on the basis of the course of ultrasonic signals released by the injection pump.

10. An apparatus as claimed in claim 1, wherein the start of the fuel supply by the injection pump is indicated on the basis of the course of ultrasonic signals released by the injection pump.

11. An apparatus as claimed in claim 1, wherein the throughflow conditions in the injection nozzle are indicated on the basis of the injection pressure course, preferably, from the ratio between two selected points of the pressure curve.

12. An apparatus as claimed in claim 1, wherein the effective output of the individual cylinders is indicated on the basis of the difference between areas below the course of both combustion and compression pressures in the cylinder.

13. An apparatus as claimed in claim 1, wherein the mechanical condition of the injection pump is indicated on the basis of the data corresponding to the integral of curve of the ultrasonic signal released by the injection pump.

14. The arrangement according to claim 1, wherein said internal combustion engine utilizes fuel injection and includes an injection pump, further comprising:

an ultrasonic or pressure transducer coupled to the delivery branch of said injection pump for providing an ultrasonic pressure signal corresponding to the cycle of operation of said pump;

analog signal processing means coupled to said transducer for providing a signal indicative of the time interval during which said pump supplies fuel in each cycle of operation thereof;

analog integrating means for providing an injection pump performance signal corresponding to the integral of the signal provided by said ultrasonic or pressure transducer, over said fuel supply time interval; and

means coupled to said integrating means for displaying said injection pump performance signal.