RU2209987C2 - Running-in and diagnostic stand for internal combustion engines - Google Patents

Abstract

FIELD: mechanical engineering; internal combustion engine. SUBSTANCE: invention relates to running-in and diagnostic systems. Proposed stand contains electric motor-brake, regulating rheostat, weight mechanism with panel of control instruments, fuel meter and transmitters of engine shaft speed, temperature, pressure in oil main, all connected to engine characteristics collection device whose output is connected with input of data processing device connected to running-in mode control device of internal combustion engine, and device for measuring fuel consumption and cabinet with power equipment. Stand includes device for collecting engine characteristics whose inputs are connected with transmitters of shafts speed, temperature and oil main pressure, said device being connected with data processing device. Output of data processing device is connected with input of running in mode control device of internal combustion engine connected to engine throttle valve control device. EFFECT: improved quality of running-in and reliability of internal combustion engine, provision of possibility of diagnosing condition of engine at any required moment. 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 (ICE).

 Known stand for running ICE [RF Patent 2118680, published September 10, 1998, bull. 25], comprising an electric motor-brake, an adjustment rheostat designed to start the electric motor-brake and regulate the speed of its rotor, as well as the load created by the electric motor in generator mode, a weight mechanism with a control panel for measuring brake and torque , a master-reference unit for heat loss power and sensors of revolutions on the shaft (W), temperature (Т), pressure in the oil line (Рм) connected to the control device, and master-sets Temperature (T) and moment (Ms), turns on the shaft (W), the inputs and outputs are connected to inputs of the control device, a device for measuring the fuel consumption and the power cabinet with the apparatus.

 However, this stand allows you to achieve the lowest possible quality due to the setters-standards, which reduce the characteristics of the engine to be rolled to standard and do not take into account the individual characteristics of each engine to be rolled.

 The technical result 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 taking into account the individual features implemented by the proposed stand, as well as the ability to diagnose the technical condition of the engine at the moment.

 The task is achieved by the fact that on the well-known engine running-in and diagnostic bench, which contains an electric motor-brake, an adjustment rheostat, a weight mechanism with a control instrument panel, a device for measuring fuel consumption, a heat loss power reference unit and shaft speed sensors (W) , temperature (Т), pressure in the oil line (Рм), a device for measuring fuel consumption and a power cabinet with equipment, contains a device for collecting engine technical characteristics (USTX), the inputs of which are connected s with speed sensors on the shaft (W), temperature (T), pressure in the oil line (Рм), connected to a data processing device (UOD), the output of which is connected to the input of the engine control module for running in the internal combustion engine (UROD) connected to the controller, throttle control (fuel pump rail) of the engine.

 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 USTX 8, the input of which is connected to temperature sensors 9, moment 7, revolutions 5, pressure in the oil line 10, the output of which is connected to the input of the UOD 11, which performs statistical data processing and sends signals to the input of the URID 12.

 At the output of UROD 12 a regulator 13 is connected that controls the throttle (fuel pump rail) 14 of the 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 reliable-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 torque (ms) on the shaft ICE 1.

 In the event that the moment on the ICE shaft 1 increases in accordance with the increase in the engine-brake 2 speed, the control signal of the revolutions is triggered, providing the necessary interval of optimal parameter values.

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

 This system achieves the rated speed (Wnom) of the internal combustion engine 1 and thereby ensures 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 hot running, 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 (Ms), speed (W), pressure (Rm).

 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.

 The signals from the UOD (temperature (Т) 9, moment (Мс) 10, revolutions (W) 11) in UROD 12 form control signals corresponding to and taking into account the individual characteristics of each engine brand.

 When switching to the automatic break-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 torque (Ms), 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 15 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 running-in and diagnostics are carried out automatically according to the main ranked parameters, taking into account the individual characteristics of each engine being driven in.

Claims (1)

 A stand for running-in and diagnostics of internal combustion engines (ICE), containing an electric motor-brake, an adjustment rheostat, a weight mechanism with a remote control, a device for measuring fuel consumption, a setter - a standard for heat loss power and sensors for shaft revolutions, temperature, oil pressure highway, a device for measuring fuel consumption and a power cabinet with equipment, characterized in that the engine break-in and diagnostic bench contains a device for collecting engine technical characteristics, inputs to otorogo connected to the sensors of revolutions on the shaft, temperature, pressure in the oil line, connected to a data processing device, the output of which is connected to the input of the engine running control device of the internal combustion engine connected to a controller that controls the engine throttle.