RU2118680C1 - Stand for test running and diagnostics of internal combustion engines - Google Patents

Abstract

FIELD: apparatuses for testing and diagnosing internal combustion engines. SUBSTANCE: stand includes brake electric motor, tuning rheostat, weighing mechanism having board with monitoring devices, unit for measuring fuel consumption, pickups for detecting shaft revolution number, temperature, pressure in oil feed line, torque of shaft of internal combustion engine. All pickups are connected with control apparatus whose output is connected with inputs and outputs of units for setting standard temperature, shaft torque of internal combustion engine, shaft revolution number. EFFECT: enhanced reliability of internal combustion engines due to test run modes. 1 dwg

Description

 The invention relates to electric brake stands for running-in (running-in, testing, acceptance) and diagnostics (determining the technical condition at the moment) of internal combustion engines.

 A known bench for running in ICEs containing an electric motor-brake, an adjusting rheostat, designed to start an electric motor-brake and regulate the speed of rotation of its rotor, as well as the load created by an electric motor in generator mode, a weight mechanism with a control panel for measuring brake and torque, a setter-standard of heat loss power, a device for measuring fuel consumption and a power cabinet with equipment.

 However, this stand does not allow to achieve the highest possible quality due to automatic control, which is carried out according to the power of heat loss, due to the complexity of its implementation in a production environment.

 The aim of the invention is to improve the quality of the break-in, increase the reliability of the internal combustion engine due to the break-in modes in the production conditions implemented by the proposed stand, as well as the ability to diagnose the technical condition of the engine at the moment.

This goal is achieved by the fact that in the well-known engine running-in and diagnostic stand, which contains an electric motor-brake, an adjustment rheostat, a weight mechanism with a control instrument panel, a device for measuring fuel consumption and sensors: temperature (T), torque on the ICE shaft (M _c ), revolutions on the shaft (w), pressure in the oil line (P _m ) connected to the control unit (УУ), the reference units are installed: temperature (T), torque on the ICE shaft (M _s ), revolutions on the shaft (W ), the inputs and outputs of which are connected to the inputs on the device.

 The drawing shows a diagram of the proposed stand.

 The stand contains an internal combustion engine 1, which is connected to the electric motor-brake 2 through the gearbox 3 and the uncoupling clutch 4. Between the gearbox 3 and the electric motor-brake 2 there is a speed sensor 5. A torque sensor 7 is installed on the weighing device 6.

 The stand contains a control unit 8, at the input of which are set-standards: temperature 9, moment 10, speed 11 and sensors: temperature 12, moment 7, speed 5, pressure in the oil line 13.

 At the output of UU 8, a regulator 14 is connected that controls the throttle flap (rail of the fuel pump) 15 of engine 1.

The system is started and, with the help of engine-brake 2, cold running is carried out from minimum stable revolutions, providing a reliably stable oil wedge in the lubrication system, the engine is brought to the optimum temperature, while the engine-brake 2 revolutions begin to stabilize the moment (M _s ) on the ICE shaft one.

 If the moment on the ICE shaft 1 grows in accordance with the increase in the engine-brake 2 revolutions, the control signal of revolutions is activated, providing the necessary interval of optimal parameter values.

If the moment on the shaft (M _s ) falls by a certain value M, the system increases the speed to maintain the required moment M _s on the ICE shaft 1 by the corresponding value M.

This system achieves the rated speed (w _nom ) of the internal combustion engine 1 and, thus, provides the running-in of the internal combustion engine depending on its technical condition in the cold running mode. As soon as the system reaches synchronous revolutions, the ignition system is turned on and the engine 1 starts. The hot break-in process begins. During the hot run-in, the load gradually increases as the moment on the ICE shaft stabilizes and the speed on the ICE shaft stabilizes until the parameters stabilize: temperature (T), moment (M _s ), speed (w), pressure (P _m ).

 After stabilization, these parameters become diagnostic. Break-in is considered complete. In the event of a pre-emergency situation, the emergency protection system according to the traditional scheme is triggered for each of the above parameters.

Signals from reference master (temperature (T) 9, torque (M _s ) 10, revolutions (w) 11) and corresponding sensor signals (temperature (T) 12, torque (M _s ) 7, revolutions (w) 5, pressure (P _m ) 13) in UU 8 form control signals, for which they are pre-set (set) so that the signals coming out of them correspond to the standard for each brand of engine.

 In the control device 8 from the signal from the setpoints and the signal from the sensors, a signal is generated that enters the control circuit of the controller 14 of the internal combustion engine 1.

When switching to the automatic running-in mode, the engine 1 sets such a moment of the crankshaft at which the temperature is the reference. The rate of increase in speed for each engine is different and depends on its technical condition and running speed. If, for any reason, the temperature (T), or the moment (M _s ), or engine speed (w) becomes higher than the optimal interval, then the crankshaft rotation speed is reduced due to the feedback signal for the corresponding parameters. As soon as the crankshaft rotation speed reaches the limit value, the circuit breakers of the instrumentation unit 16 are activated, which either turn off the entire system (running-in is completed) or transfer the internal combustion engine 1, which is undergoing hot-running, to an additional test mode, increasing the load and turning on the power meters and fuel consumption.

 After measuring the power and fuel consumption, the stand turns off, and the run-in is considered complete.

Thus, the claimed stand differs from the prototype in that the run-in and diagnostics are carried out automatically according to the main ranked parameters, which simultaneously reflect the engine as a control object, the running-in process, the diagnostic process and the time when the running-in is over, and are control and diagnostic: T - temperature of the internal combustion engine; M _s - engine torque; w - revolutions on the motor shaft; P _m - pressure in the oil line of the engine.

Sources of information
1. Development and implementation of ACS for the main production of ARZ using microprocessor technology. Bondarenko V.A., Durnev K.F. and others. Report on research, UDC 629.113, N state registration 01860056216, inventory N 02910047382, ORI, Orenburg 1989, p. 82-87.

Claims (1)

A stand for running-in and diagnostics of an internal combustion engine (ICE), comprising an electric brake motor, an adjustment rheostat, a weight mechanism with a control instrument panel, a device for measuring fuel consumption and speed sensors on the shaft (W), temperature (T), pressure in the oil line (P _m ), the moment on the ICE shaft (M _c ) connected to the control device, characterized in that the stand contains reference units, temperature (T), the moment on the ICE shaft (M _c ), revolutions on the shaft (W), the inputs and outputs of which are connected to the inputs on the device.