Test system for checking reliability of air inlet heater

Abstract

The utility model discloses a test system for checking the reliability of an air inlet heater. The test system comprises an air inlet pipe, a fan, the air inlet heater, a relay, a temperature acquisition unit and a controller, the air inlet heater is mounted in the air inlet pipe, and the fan is arranged at an inlet of the air inlet pipe; the temperature acquisition unit is connected with the controller, and the controller is connected with the air inlet heater through a relay loop; the test system for checking the reliability of the air inlet heater can meet the requirement for checking the reliability of repeated and continuous heating of the air inlet heater, meanwhile, the fan device is additionally arranged to simulate the engine idling working condition, the air inlet amount is closer to the actual working condition of the heater, and the actual control logic of the heater is fully referred; and the actual use boundary of the gas inlet heater can be fully simulated. In addition, examination resources of the whole machine do not need to be occupied, and the heater with an improved structure and an improved material can be fully examined.

Description

Technical Field

[0001] The utility model belongs to the technical field of engine heater performance testing, and particularly relates to a test system for evaluating the reliability of an intake air heater. Background Art

[0002] The statements herein only provide background art related to the utility model, and do not necessarily constitute prior art.

[0003] The engine intake air heater is mainly used to heat the engine intake air temperature when the engine is in a low ambient temperature condition. Since its structure is mainly composed of electrothermal resistance materials, the following failures are likely to occur during operation: a) sintering short circuit, the electrothermal resistance material breaks, and with the intake air entering the engine cylinder, it may cause serious consequences such as cylinder inversion; b) the grille burns out, unable to heat the intake air, and the engine cannot start. Therefore, the reliability of the intake air heater is very important, and its reliability needs to be focused on during the design and development process. In the prior art, usually, the reliability performance test of the intake air heater is carried out on the whole engine. This test method occupies the test resources of the whole engine, resulting in a high test cost; and the whole test process needs to be realized through ECU control, and the operation process is complex, resulting in a low test efficiency of the intake air heater. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a test system for evaluating the reliability of an intake air heater, which can realize the performance test of the intake air heater alone without occupying the test resources of the whole engine. At the same time, the system can simulate the heating, cooling of the intake air heater on the whole engine and the intake air volume of the intake pipe, and realize the reliability test assessment of the intake air heater on the component test bench.

[0005] In order to achieve the above purpose, the utility model is realized by the following technical solutions:

[0006] In a first aspect, an embodiment of the utility model provides a test system for evaluating the reliability of an intake air heater. The intake air heater is installed in the intake pipe, and the fan is arranged at the inlet of the intake pipe; the temperature acquisition unit, the fan and the controller are connected, and the controller is connected to the intake air heater through a relay circuit; the controller is used to control the fan and the intake air heater according to the preheating, starting, post-heating and cooling processes of the intake air heater, and cycle the above processes to conduct reliability assessment on the intake air heater.

[0007] As a further technical solution, the temperature acquisition unit includes an intake air temperature sensor, an outlet air temperature sensor and a heater temperature sensor.

[0008] As a further technical solution, the intake air temperature sensor is arranged at the inlet of the intake pipe, the outlet air temperature sensor is arranged at the outlet of the intake pipe, and the heater temperature sensor is arranged on the intake heater.

[0009] As a further technical solution, a flow sensor is also arranged at the inlet of the intake pipe.

[0010] As a further technical solution, the flow sensor is connected to the controller.

[0011] As a further technical solution, the relay circuit includes a relay coil and a switching power supply.

[0012] As a further technical solution, the normally open contact and the normally closed contact of the relay coil are connected in the power supply circuit of the intake heater, and the switching power supply is connected to the controller.

[0013] As a further technical solution, the switching power supply is connected to the controller.

[0014] As a further technical solution, the controller adopts a PLC controller.

[0015] As a further technical solution, the fan adopts a variable frequency fan.

[0016] The beneficial effects of the above embodiments of the present invention are as follows:

[0017] The test system for evaluating the reliability of the intake heater of the present invention can meet the requirements for repeatedly and continuously heating the intake heater to evaluate its reliability. At the same time, a fan device is added to simulate the intake air volume under the engine idle condition, making it closer to the actual working condition of the heater, fully referring to the actual control logic of the heater, and more fully simulating the actual use boundary of the intake heater.

[0018] The test system for evaluating the reliability of the intake heater of the present invention fully simulates the heating, cooling and ventilation states of the intake heater on the whole machine, getting closer to the actual use boundary to evaluate the reliability of the intake heater; in addition, it does not need to occupy the resources for evaluating the whole machine, and can fully evaluate the heaters with structural improvements and material improvements.

[0019] The test system for evaluating the reliability of the intake heater of the present invention realizes the control of the heating time and the opening and closing of the intake heater through a relay. The relay can effectively isolate the control signal and the controlled circuit, providing higher safety and reliability. Description of the Drawings

[0020] The accompanying drawings of the specification, which form a part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0021] Figure 1 It is the schematic diagram of the test system for evaluating the reliability of the intake air heater of the present utility model.

[0022] The schematic diagram is only for illustration;

[0023] Among them, 1. intake pipe; 2. fan; 3. intake air heater; 4. relay; 401. switching power supply; 402. relay coil; 403. normally open contact; 404. normally closed contact; 5. intake air temperature sensor; 6. outlet air temperature sensor; 7. heater temperature sensor; 8. controller. Detailed implementation manners

[0024] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further explanations of the present utility model. Unless otherwise specified, all technical and scientific terms used in the present utility model have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0025] Embodiment 1

[0026] In a typical implementation manner of the present utility model, as Figure 1 shown, a test system for evaluating the reliability of the intake air heater is provided, including an intake pipe 1, a fan 2, an intake air heater 3, a relay 4, a temperature acquisition unit, and a controller 8; the intake air heater 3 is installed in the intake pipe 1, and the fan 2 is arranged at the inlet of the intake pipe 1; the temperature acquisition unit is connected to the controller 8, and the controller 8 is connected to the intake air heater 3 through a relay 4 circuit; the controller is used to control the fan and the intake air heater according to the preheating, starting, post-heating, and cooling processes of the intake air heater, and cycle the above processes to evaluate the reliability of the intake air heater.

[0027] Specifically, the controller 8 controls the opening and closing of the intake air heater and the opening and closing of the fan through the relay, simulates the preheating, starting, post-heating, and cooling processes of the intake air heater on the whole machine, and cycles the above processes to evaluate the reliability of the intake air heater.

[0028] In this embodiment, the temperature acquisition unit includes an intake air temperature sensor 5, an outlet air temperature sensor 6, and a heater temperature sensor 7. Among them, the intake air temperature sensor 5 is arranged at the inlet of the intake pipe 1 to detect the temperature of the gas entering the intake pipe; the outlet air temperature sensor 6 is arranged at the outlet of the intake pipe 1 to detect the temperature of the gas in the outlet pipe; the heater temperature sensor 7 is arranged on the intake heater 3 to detect the heating temperature of the intake heater 3.

[0029] In this embodiment, a flow sensor is further arranged at the inlet of the intake pipe 1. The flow sensor is connected to the controller 8. The fan 2 is a variable frequency fan. The flow sensor collects the intake air flow of the intake pipe 1 and feeds it back to the controller 8. The fan 2 is electrically connected to the controller 8. The controller 8 adjusts the air volume of the fan 2 as needed to change the intake air volume of the intake pipe.

[0030] In this embodiment, the relay circuit of the relay 4 includes a relay coil 402 and a switching power supply 401. The normally open contact 403 and the normally closed contact 404 of the relay coil 402 are connected in the power supply circuit of the intake heater 3. The switching power supply 401 is connected to the controller 8. By controlling the on-off of the switching power supply 401 through the controller 8, the on-off of the relay coil 402 is controlled, and the on-off of the normally open contact 403 and the normally closed contact 404 is realized.

[0031] In this embodiment, the controller 8 adopts a PLC controller.

[0032] The working principle of the test system for evaluating the reliability of the intake heater provided in this embodiment is as follows:

[0033] The intake air temperature sensor 5 collects the intake air temperature of the intake pipe 1, the outlet air temperature sensor 6 collects the outlet air temperature of the intake pipe 1, and the heater temperature sensor 7 collects the heating temperature of the intake heater 3, and transmits the collected intake air temperature, outlet air temperature, and heating temperature to the controller 8 to realize the detection of temperature in the performance test of the intake heater; the flow sensor collects the intake air flow of the intake pipe 1 and transmits it to the controller 8, and the controller 8 adjusts the air volume of the fan 2 according to the test requirements; the controller 8 controls the on-off of the relay 4 to control the on-off of the power supply circuit of the intake heater 3 and realizes the control of the heating time of the intake heater 3.

[0034] The test system for evaluating the reliability of the intake heater provided in this embodiment fully simulates the heating steps of the heater on the whole machine, and at the same time adds a final cooling step to fully cool down for the next cycle.

[0035] 1. Preheating: The preheating process is realized by setting the on-time of the relay, and the fan does not ventilate;

[0036] 2. Starting: The relay is disconnected, and the heater stops heating; the fan starts ventilation, and the air volume is the engine idle air volume.

[0037] 3. Rear heating: The relay is connected, the heater heats up, and at the same time the fan ventilates, and the air volume is the engine idle air volume.

[0038] 4. Cooling: The relay is disconnected, and the heater stops heating; the fan ventilates, and the air volume is the maximum to fully cool the heater. Identify and judge from the outlet temperature sensor. If the intake heater grille is fully cooled, start the next test cycle.

[0039] To increase the accuracy of the test, the above test cycle needs to be carried out in the cold storage, and the duration of each cycle is determined according to the starting calibration data of the model supporting the heater.

[0040] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A test system for evaluating the reliability of an air intake heater, characterized in that: It includes an intake pipe, a fan, an intake heater, a relay, a temperature collection unit and a controller; the intake heater is installed in the intake pipe, and the fan is set at the inlet of the intake pipe; the temperature collection unit and the fan are connected to the controller, and the controller is connected to the intake heater through a relay circuit; the controller is used to control the fan and the intake heater according to the preheating, starting, post-heating and cooling processes of the intake heater, and the above process is cycled to perform reliability assessment on the intake heater.

2. The test system for evaluating the reliability of an air intake heater according to claim 1, characterized in that: The temperature acquisition unit includes an intake air temperature sensor, an outlet air temperature sensor and a heater temperature sensor.

3. The test system for evaluating the reliability of an air intake heater according to claim 2, characterized in that: The intake air temperature sensor is arranged at the inlet of the intake pipe, the outlet air temperature sensor is arranged at the outlet of the intake pipe, and the heater temperature sensor is arranged on the intake air heater.

4. The test system for evaluating the reliability of an air intake heater as claimed in claim 3, characterized in that: A flow sensor is also arranged at the inlet of the air intake pipe.

5. The test system for evaluating the reliability of an air intake heater as claimed in claim 4, characterized in that: The flow sensor is connected to the controller.

6. The test system for evaluating the reliability of an air intake heater according to claim 1, characterized in that: The relay circuit includes a relay coil and a switching power supply.

7. The test system for evaluating the reliability of an air intake heater according to claim 6, characterized in that: The normally open contact and the normally closed contact of the relay coil are connected in a power supply circuit of the air intake heater.

8. The test system for evaluating the reliability of an air intake heater according to claim 6, characterized in that: The switch power supply is connected to the controller.

9. The test system for evaluating the reliability of an air intake heater according to claim 1, characterized in that: The controller adopts a PLC controller.

10. The test system for evaluating the reliability of an air intake heater according to claim 1, characterized in that: The fan is a variable frequency fan.

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