SU775651A1 - Stand for testing internal combustion engine electric starter - Google Patents

Description

(54) INTERNAL COMBUSTION ENGINE ELECTRIC STARTER BENCHES The invention relates to the field of electrical testing and can be used to remove the electromechanical characteristics of automobile, tractor and other starters. A stand for testing electric starters is known, which contains a power source, a contactor and measuring instruments connected to the sensors of measured parameters 1. The disadvantage of such stands is the absence of a loading device, which allows the starter to be tested only in two modes: idle and full braking. Also known is a stand for testing electric starters, containing a load device, a power source, a contactor, a start button and measuring instruments, the inputs of which are connected to sensors of measured parameters, and control outputs to pulse sensor 2. The emergence of digital measuring instruments made it possible to measure all parameters simultaneously using a pulse sensor, which made the tests accurate. The disadvantage of this type of stand should include a longer test duration. The second major disadvantage is the high cost of the load device, which is a specially manufactured DC machine with a movable stator. The aim of the invention is to reduce the testing time and simplify the design. For this purpose, an adjustable delay unit (RHL), a delay unit and a contactor control unit (BEEC) are additionally introduced into the stand, the input of the pulse sensor is connected to the start button through the adjustable delay unit, and the output is connected to the reset input of the adjustable delay unit and the first input of the contactor control unit, the second input of which is connected to the start button and the output to the contactor. The drawing shows the functional layout of the test bench for electric starters. The test starter 1 is connected via the contactor 2 to the power supply 3. The shaft of the load device 4 is articulated with the starter shaft 1. As the load device 4, a removable flywheel is used, the mass of which varies depending on the rated power of the starter, or a brake that allows the starter to slow down to a complete stop. The required parameters are controlled using sensors 5, 6, 7 and 8 of current, voltage, speed and moment, respectively, and the measuring inputs of digital measuring devices 9, 10, 11, 12 connected to them. The control inputs of devices 9, 10, 11 and 12 and the input of the delay unit 13 are connected to the output of the pulse sensor 14, which is connected to the start button: via the adjustable delay unit 15. The turning on and off of the contactor 2 is carried out by the contactor control unit 16, which is a relay element with two stable states. The transition from one state to another is carried out by applying a control pulse to one of the two inputs. The first input of the block 16 is connected to the output of the delay block 13 and to the reset input of the adjustable lag block 15, the second to the start button.

As a pulse sensor 14, a one-shot or a differentiating chain can be used.

In block 15 of adjustable delay, the task is set by a parameter (t, I, M, V, p), compared with the current value of the parameter and at the moment of their equality, a command is issued for measurement.

The device works as follows.

The operator sets in block 15 the desired lag time. When the start button is pressed, block 16 turns on contactor 2 and starts acceleration of starter 1. At the same time, block 15 counts the time from the start of start. , 10 ,, 11 and 12 and for block 13. Simultaneous measurement of all parameters occurs. The delay unit 13, after a time not less than the time of analog-digital conversion of measuring devices, disconnects the starter from the power source 3 with the help of unit 16 and contactor 2 and issues a command to set unit 15 to its initial state. Starter acceleration 1 is over. The measurement results are stored with digital devices 9, 10, 11 and 12 until the next run.

When used as a braking device, the circuit works similarly, but the starter accelerates to idle. The signal from the start button enters the block 15 and the brake device. At the end of the measurement unit 16 turns off the contactor and brake.

Since when starter 1 is started, speed and current (and, consequently, the moment) vary over the entire operating range, then the delay time can be removed at start-ups to remove any point on the characteristics of the starter. The mode of full braking due to the presence of an electromagnetic permanent starter core is removed when the starter is braked. With this test method, the main type of load on the starter is the dynamic load. Therefore, the torque must be measured or on the shaft.

0 starter or under the supports of the movable stator of the starter. The proposed stand scheme allows for a shorter test time due to a shorter working time.

5 The expensive load device was replaced by a flywheel, which simplifies the design of the stand.

Claims (2)

Invention Formula 0 Stand for testing electric starters for an internal combustion engine containing a load device, a power source, a contactor, a start button and digital gauges (instruments that have measurement inputs connected to sensors of measured parameters, and control inputs to a pulse sensor, characterized in , in order to simplify the design and reduce the test time, the stand additionally contains an adjustable delay unit, a delay unit and a contactor control unit, with the input of the pulse sensor connected to the button th trigger unit via a controlled lag, and output through the block delay unit is connected to the reset input of the controlled lag and the first input of the contactor control unit, the second input of which is connected to the start button, and an output - to the contactor. Sources of information taken into account in the examination 5 1. Borovskikh yu. I. Electrical equipment of cars. M., Transporter, 1971, p. 147-154. 2. Electrical equipment of cars. Under, ed. S.V. Bannikova, M., Transport, 1965, p. 119-121.