RU2229612C2 - Internal combustion engine running-in and test stand - Google Patents

Abstract

FIELD: mechanical engineering+ADs- testing facilities. SUBSTANCE: invention relates to electric brake rigs for running-in and diagnosing condition of internal combustion engines. Invention makes it possible to check condition of engine at specified moment from point of view of ecological safety and improve quality of running-in and safety and reliability. Proposed test rig contains electric motor-brake, adjusting rheostat, weight mechanism with control instrument panel, fuel flow-rate meter, shaft speed, temperature and oil pressure in main line and engine shaft torque transmitters connected to control device to input of which inputs and outputs of setters-standards of temperature, engine shaft torque and engine shaft speed are connected. Rig contains also gas analyzer determining concentration of hydrocarbons (CH) and carbon monoxide (CO) in exhaust gases and setters-standards of concentration of hydrocarbons (CH) and carbon monoxide(CO) whose input and outputs are connected with inputs of control device. EFFECT: improved quality of running-in and increased reliability. 1 dwg

Description

The invention relates to mechanical engineering, namely to electric brake stands for running-in (running-in, testing, acceptance) and diagnostics (determining the current technical condition) of internal combustion engines (ICE).

A known bench for running in ICE (RF Patent No. 2118680, IPC 6 F 02 V 79/00, G 01 M 15/00, BI No. 25 of 09/10/98), containing an electric motor-brake, adjusting rheostat, weight mechanism with a control panel instruments, a device for measuring fuel consumption, speed sensors on the shaft, temperature, pressure in the oil line, torque on the ICE shaft, connected to a control device, the inputs of which are also connected to the outputs of the setpoint temperature standards, torque on the ICE shaft, revolutions to shaft.

However, this test bench for internal combustion engines and diagnostics during the hot engine break-in allows only temperature, crankshaft speed, engine torque and pressure in the oil line to be monitored, while monitoring the exhaust gas composition requires additional material costs and time.

The objective of the proposed stand is the ability to diagnose the technical condition of the engine at the moment from the standpoint of environmental safety, as well as improving the quality of the running-in and increasing the reliability of the internal combustion engine.

The task is achieved in that the engine break-in and diagnostic bench, comprising an electric brake motor, an adjustment rheostat, a weighing device with a control instrument panel, speed sensors on the shaft, temperature, pressure in the oil line, torque on the engine shaft, connected to the control device, the input of which is also connected to the inputs and outputs of the reference standards of temperature, torque on the ICE shaft, revolutions on the shaft, contains a gas analyzer that determines the concentration of hydrocarbons (CH) and carbon monoxide (СО) in the exhaust gases, and master-standards for the concentration of hydrocarbons (СН) and carbon monoxide (СО), the inputs and outputs of which are connected to the inputs of the control device.

The drawing shows a diagram of the proposed stand.

The engine running-in and diagnostic stand includes an internal combustion engine 1, which is connected to the electric motor-brake 2 through the gearbox 3 and the uncoupling clutch 4. A speed sensor 5 is installed between the gearbox 3 and the electric motor-brake 2. A torque sensor is installed on the weight mechanism 6 7.

The ICE running-in and diagnostic stand contains UU 8, a control and measuring equipment unit 9, at the input of which reference sensors are connected: temperature 10, moment 11, revolutions 12, hydrocarbon concentrations (СН) 13 and carbon monoxide (СО) 14 and sensors: temperatures 15, moment 7, revolutions 5, pressure in the oil line 16, concentrations of hydrocarbons (СН) 17 and carbon monoxide (СО) 18, a gas analyzer 19 and a sampling probe 20. At the output of УУ 8 a regulator 21 is connected that controls the throttle (fuel pump rail ) 22 engines 1.

The weighing device 23 is connected to the engine-brake 2. The actuator 24 of the weighing device 23 is connected to the output of the SU 8.

The engine running-in and diagnostic stand are started and, using the brake engine 2, the cold-running operation is carried out in a known manner. As soon as the engine break-in and diagnostic stand reaches synchronous speed, engine 1 starts. The hot break-in process begins.

Signals from the master settings of temperature (T) 10, moment (M _s ) 11, revolutions (W) 12, hydrocarbon concentrations (СН) 13 and carbon monoxide (СО) 14 and the corresponding signals from temperature sensors (Т) 15, moment (Мс) ) 7, revolutions (w) 5, pressure (P _m ) 16, concentrations of hydrocarbons (СН) 17 and carbon monoxide (СО) 18 in УУ 8 form control signals, for which they are pre-set (set) so that those coming out of them the signals corresponded to the standard for each brand of engine.

In the control device 8 from the signal from all the master standards and the signal from all sensors, a signal is generated that enters the control circuit of the controller 21 of the internal combustion engine 1.

During the hot run-in, using the weighing device 23 and the actuator 24, the load gradually increases as the moment stabilizes on the ICE shaft and the revolutions on the ICE shaft until the parameters are stabilized: temperature (T), moment (M _s ), speed ( W), pressure (P _m ). After stabilization, these parameters become diagnostic.

After these parameters are stabilized, the engine is put into idle mode and a gas analyzer is turned on, which determines the concentrations of hydrocarbons (CH) and carbon monoxide (CO) according to the method for determining concentrations according to GOST 17.2.2.03-87. If the obtained values of the concentrations of hydrocarbons (SN) and carbon monoxide (CO) are acceptable, the switches of the control unit 9 turn off the entire engine run-in and diagnostics stand (run-in is completed). If the obtained values of the concentrations of hydrocarbons (CH) and carbon monoxide (CO) exceed the permissible values, then the switches of the control unit 9 transfer the internal combustion engine 1 to an additional break-in mode, increasing the load. After completing the additional break-in regime, the gas analyzer is again turned on, which determines the concentrations of hydrocarbons (CH) and carbon monoxide (CO). After the obtained values of the concentrations of hydrocarbons (CH) and carbon monoxide (СО) will correspond to the permissible values established in accordance with the specified GOST, the run-in is considered complete.

Thus, the claimed engine running-in and diagnostic bench compared to the prototype contains a gas analyzer that determines the concentration of hydrocarbons (CH) and carbon monoxide (CO) in the exhaust gases, and master gauges for the concentration of hydrocarbons (CH) and carbon monoxide (CO), inputs and the outputs of which are connected to the inputs of the control device, which makes it possible to diagnose the technical condition of the engine at the moment from the standpoint of environmental safety, as well as improving the quality of the running-in and increasing the reliability of the internal combustion engine.

Claims (1)

A stand for running-in and diagnostics of internal combustion engines, containing an electric motor-brake, an adjustment rheostat, a weight mechanism with a control instrument panel, a device for measuring fuel consumption, speed sensors on the shaft, temperature, pressure in the oil line, torque on the shaft of the internal combustion engine, connected to the control device, to the input of which the inputs and outputs of the reference units of temperature, torque on the shaft of the internal combustion engine, revolutions on the shaft are also connected, I distinguish The fact that the stand contains a gas analyzer that determines the concentration of hydrocarbons (CH) and carbon monoxide (CO) in the exhaust gases, and master gauges for the concentration of hydrocarbons (CH) and carbon monoxide (CO), the inputs and outputs of which are connected to the inputs of the control device.