Detection device and method for engine glow plug control box

Abstract

The invention discloses detection equipment and method for an engine glow plug control box. The engine glow plug control box controls a glow plug load loop in an engine to be powered on and work, the detection device is used for simulating the glow plug load loop, and the detection device comprises a shell, a power input interface, a glow plug circuit, a main control switch and a test interface. The power input interface is arranged on the shell. The glow plug circuit is arranged in the shell, and the output end of the glow plug circuit is grounded. The master control switch is arranged on the shell, one end of the master control switch is connected with the power input interface, and the other end is connected with the input end of the glow plug circuit. The test interface is connected with the other end of the main control switch and the input end of the glow plug circuit and is used for being connected with a to-be-tested engine glow plug control box. And the glow plug circuit is electrified to work within continuous preset time under the control of the to-be-detected engine glow plug control box so as to detect the to-be-detected engine glow plug control box. The glow plug load loop is simulated through the detection equipment, and the test process is simplified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aero-engine, and particularly relates to a detection device and method of an engine pre-heat plug control box. BACKGROUND

[0002] The engine pre-heat plug control box is a control component in the electrical control system of an engine. In the field of aviation, the detection of the engine pre-heat plug control box is involved in the process of aircraft production and detection.

[0003] The existing technology detects the engine pre-heat plug control box of an aircraft by installing the engine pre-heat plug control box to the engine of the aircraft and connecting the pre-heat plug load circuit of the engine. The present inventor finds that this detection method needs to repeatedly install the to-be-detected engine pre-heat plug control box to the engine. For example, the existing technology detects each to-be-detected engine pre-heat plug control box by installing all the to-be-detected engine pre-heat plug control boxes to the engine one by one, and verifying whether each to-be-detected engine pre-heat plug control box is normal by testing whether the engine can be started normally. This detection method is complicated and low in detection efficiency.

[0004] The content in the background section merely represents the technical knowledge of the discloser, and does not necessarily represent the state of the art in the field. SUMMARY

[0005] The present application aims to provide a detection device of an engine pre-heat plug control box to solve at least one of the above technical problems.

[0006] According to an aspect of the present application, a detection device of an engine pre-heat plug control box is provided. The engine pre-heat plug control box controls the pre-heat plug load circuit inside the engine to work. The detection device is used to simulate the pre-heat plug load circuit, and the detection device comprises a shell, a power input interface, a pre-heat plug circuit, a main control switch and a test interface. The power input interface is arranged on the shell. The pre-heat plug circuit is arranged inside the shell, and the output end of the pre-heat plug circuit is grounded. The main control switch is arranged on the shell, and one end of the main control switch is connected to the power input interface. The test interface is connected to the other end of the main control switch and the input end of the pre-heat plug circuit, and the test interface is used to connect to the to-be-detected engine pre-heat plug control box. The pre-heat plug circuit works under the control of the to-be-detected engine pre-heat plug control box for a continuous preset time to detect the to-be-detected engine pre-heat plug control box.

[0007] Optionally, the pre-heat plug circuit comprises a circuit breaker module, a pre-heat plug module and a pre-heat plug module support. One end of the circuit breaker module is connected to the test interface. One end of the pre-heat plug module is connected to the other end of the circuit breaker module. One end of the pre-heat plug module support is connected to the other end of the pre-heat plug module, and the other end is grounded.

[0008] Optionally, the circuit breaker module comprises a first circuit breaker, a second circuit breaker, a third circuit breaker and a fourth circuit breaker. The first circuit breaker, the second circuit breaker, the third circuit breaker and the fourth circuit breaker are connected to the other end of the control switch. The glow plug module comprises a first glow plug, a second glow plug, a third glow plug and a fourth glow plug. The first glow plug is connected in series between the first circuit breaker and the glow plug module support. The second glow plug is connected in series between the second circuit breaker and the glow plug module support. The third glow plug is connected in series between the third circuit breaker and the glow plug module support. The fourth glow plug is connected in series between the fourth circuit breaker and the glow plug module support.

[0009] Optionally, the shell is provided with an inspection opening, and the inspection opening is located at a position corresponding to the mounting area of the glow plug module.

[0010] Optionally, the detection device further comprises a first indicator light. The first indicator light is arranged on the shell and connected in series between the test interface and the other end of the main control switch.

[0011] Optionally, the detection device further comprises a second indicator light. The second indicator light is arranged on the shell and connected in series between the input end of the glow plug circuit and the test interface.

[0012] Optionally, the detection device further comprises a current detection module. The current detection module is arranged on the glow plug circuit to detect the current value of the glow plug circuit.

[0013] According to another aspect of the present application, a detection method of an engine glow plug control box is also provided. The engine glow plug control box controls the glow plug load circuit inside the engine to work in power-on mode, and the detection device is used to simulate the glow plug load circuit. The detection method comprises the following steps: closing the control switch to turn on the engine glow plug control box to be detected; controlling the engine glow plug control box to be detected to work so that the glow plug circuit of the detection device works in power-on mode; detecting the current value of the glow plug circuit during the power-on working process; and determining the correspondence between the current value and the preset current threshold range within a continuous preset time to complete the detection of the engine glow plug control box to be detected.

[0014] Optionally, the step of controlling the engine glow plug control box to be detected to work so that the glow plug circuit of the detection device works in power-on mode comprises the following steps: providing a preset high-level signal to the glow plug enable end of the engine glow plug control box to be detected to turn on the glow plug function of the engine glow plug control box to be detected; and controlling the glow plug circuit to work in power-on mode through the glow plug function of the engine glow plug control box to be detected.

[0015] Optionally, the step of controlling the engine glow plug control box to be detected to work so that the glow plug circuit of the detection device works in power-on mode comprises the following steps: placing the engine glow plug control box to be detected in a preset temperature environment to trigger the glow plug function of the engine glow plug control box to be detected; and controlling the glow plug circuit to work in power-on mode through the glow plug function of the engine glow plug control box to be detected.

[0016] Advantages

[0017] The technical scheme of the present application simulates a preheating plug load circuit through a detection device, avoids installing a to-be-tested engine preheating plug control box to the inside of the engine for testing in the testing process, and thus simplifies the testing process and improves the detection efficiency. The grounding design and the shell packaging avoid the short circuit risk in the testing process. The main control switch can urgently cut off the circuit, avoiding overcurrent damage caused by faults of the to-be-tested engine preheating plug control box. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 A structural schematic diagram of a detection device of an embodiment of the present application is shown;

[0020] Figure 2 A flowchart of a detection method 1000 of an embodiment of the present application is shown;

[0021] Figure 3 A flowchart of step S120 of the detection method 1000 of an embodiment of the present application is shown;

[0022] Figure 4 Another flowchart of step S120 of the detection method 1000 of an embodiment of the present application is shown.

[0023] Explanation of reference signs:

[0024] Detection device 1; shell 11; power input interface 12; preheating plug circuit 13; main control switch 14; test interface 15; maintenance opening 16; first indicator light 17; second indicator light 18; preheating plug grounding circuit detection contact 19; circuit breaker module 131; preheating plug module 132; preheating plug module support 133; first circuit breaker 1311; second circuit breaker 1312; third circuit breaker 1313; fourth circuit breaker 1314; first preheating plug 1321; second preheating plug 1322; third preheating plug 1323; fourth preheating plug 1324. DETAILED DESCRIPTION

[0025] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, the example embodiments can be implemented in any number of ways not expressly illustrated herein. The embodiments described herein are not limiting, and should not be construed as such. Rather, these embodiments are described herein to illustrate the example embodiments (including best mode) and to enable others skilled in the art to practice the example embodiments.

[0026] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the

[0027] Moreover, the terms "first," "second," "third," etc. are used herein to describe various elements, but the elements should not be limited by these terms. The terms "first," "second," "third," and so forth are generally only used to distinguish one element from another, and do not imply a particular group or order of elements.

[0028] The terms "first," "second," "third," etc. in the specification and claims of this application and above description of the drawings are used to distinguish between similar objects, not to describe a particular sequential order.

[0029] The technical solutions of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. The described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] According to an aspect of the present application, a detection device of an engine glow plug control box is provided. The engine glow plug control box controls the glow plug load circuit in the engine to be powered on. Figure 1 The structural schematic diagram of the detection device of the embodiment of the present application is shown. According to the example embodiment, as shown in Figure 1 The detection device 1 is used to simulate the glow plug load circuit, and the detection device 1 includes a shell 11, a power input interface 12, a glow plug circuit 13, a main control switch 14 and a test interface 15.

[0031] For example, the power input interface 12 is arranged on the shell 11. The glow plug circuit 13 is arranged inside the shell 11, and an output end of the glow plug circuit 13 is grounded. The main control switch 14 is arranged on the shell 11, and one end of the main control switch 14 is connected to the power input interface 12. The test interface 15 is connected to the other end of the main control switch 14 and an input end of the glow plug circuit 13, and the test interface 15 is used to connect the engine glow plug control box to be tested to the glow plug circuit 13.

[0032] The glow plug circuit 13 is powered on for a continuous preset time under the control of the engine glow plug control box to be tested, so as to detect the engine glow plug control box to be tested.

[0033] For example, the engine glow plug control box is a controller for controlling the working of the glow plug in the engine, and the working time of the glow plug is controlled by a relay or a transistor switch, and the engine glow plug control box has the functions of timed heating at low temperature starting and overload protection. The glow plug load circuit is a current path composed of a glow plug (a resistor) in the engine, and is used to quickly heat the intake chamber or the combustion chamber of the engine.

[0034] For example, the shell 11 can be made of an insulating material. For example, the shell 11 can be made of an alumina ceramic material with a high temperature resistance of 1000°C. For example, the power input interface 12 is used to connect an external power supply, and for example, the external power supply has a power supply voltage of 28V. For example, the glow plug circuit 13 is an equivalent glow plug load circuit simulating the glow plug load circuit, and is used to replace the real glow plug load circuit, and the resistance characteristic of the glow plug circuit 13 matches the load characteristic of the real glow plug load circuit. For example, the heating curve of the glow plug of the glow plug circuit 13 is the same as the heating curve of the glow plug of the real glow plug load circuit.

[0035] For example, the main control switch 14 can be a manually or automatically controlled power switch, and for example, the main control switch 14 is a single-pole single-throw switch. For example, the test interface 15 is a connection node for connecting the engine glow plug control box to be tested to the glow plug circuit 13. The test interface 15 provides a physical terminal to realize the current path of the engine glow plug control box to be tested and the glow plug circuit 13. For example, the test interface 15 can be an aviation plug.

[0036] Through the above embodiment, the technical scheme of the present application simulates the glow plug load circuit through the detection equipment, avoids the installation of the engine glow plug control box to be tested in the engine during the test, and thus simplifies the test process and improves the detection efficiency. The ground design and the shell design avoid the short circuit risk during the test. The main control switch can be used to urgently cut off the circuit, and the overcurrent damage caused by the failure of the engine glow plug control box to be tested is avoided.

[0037] According to an example embodiment, the pre-heat plug circuit 13 comprises a breaker module 131, a pre-heat plug module 132 and a pre-heat plug module support 133. The breaker module 131 is connected to the test interface 15 at one end. The pre-heat plug module 132 is connected to the other end of the breaker module 131 at one end. The pre-heat plug module support 133 is connected to the other end of the pre-heat plug module 132 at one end and grounded at the other end.

[0038] For example, the detection device 1 is provided with a pre-heat plug ground loop detection contact 19 for detecting whether the pre-heat plug module 132 is grounded.

[0039] For example, the breaker module 131 is an over-current protection device. For example, the breaker module 131 cuts off the circuit when the current flowing through the breaker module 131 exceeds 30A. For example, the pre-heat plug module 132 can simulate the resistance load of a real pre-heat plug. For example, the pre-heat plug module support 133 is a metal piece for mechanically fixing the pre-heat plug module 132 and grounding the pre-heat plug module 132 so that the pre-heat plug module 132 can be connected to the ground.

[0040] Through the above embodiment, the technical scheme of the present application reduces the risk of equipment damage caused by current overload during testing through the double protection of the breaker module and the ground.

[0041] According to an example embodiment, the breaker module 131 comprises a first breaker 1311, a second breaker 1312, a third breaker 1313 and a fourth breaker 1314. The first breaker 1311, the second breaker 1312, the third breaker 1313 and the fourth breaker 1314 are all connected to the other end of the control switch. The pre-heat plug module 132 comprises a first pre-heat plug 1321, a second pre-heat plug 1322, a third pre-heat plug 1323 and a fourth pre-heat plug 1324. The first pre-heat plug 1321 is connected in series between the first breaker 1311 and the pre-heat plug module support 133. The second pre-heat plug 1322 is connected in series between the second breaker 1312 and the pre-heat plug module support 133. The third pre-heat plug 1323 is connected in series between the third breaker 1313 and the pre-heat plug module support 133. The fourth pre-heat plug 1324 is connected in series between the fourth breaker 1314 and the pre-heat plug module support 133.

[0042] For example, the first breaker 1311, the second breaker 1312, the third breaker 1313 and the fourth breaker 1314 are all independent over-current protection units. For example, the first breaker 1311, the second breaker 1312, the third breaker 1313 and the fourth breaker 1314 can all be micro breakers.

[0043] For example, the first pre-heat plug 1321, the second pre-heat plug 1322, the third pre-heat plug 1323 and the fourth pre-heat plug 1324 can all be nickel-chromium alloy resistance loads.

[0044] Through the above embodiment, the technical scheme of the present application communicates the independent test circuits of the four circuit breakers, the preheating plug and the support, and the failure of a single circuit will not affect the overall detection process, thereby improving the stability and reliability of the test process.

[0045] According to an example embodiment, the shell 11 is provided with an inspection opening 16, and the position of the inspection opening 16 corresponds to the mounting area of the preheating plug module 132.

[0046] For example, the inspection opening 16 is an inspection through hole provided on the shell 11, through which the internal components of the detection device 1 can be inspected by the inspection personnel. Exemplarily, the inspection opening 16 can be a rectangular or circular through hole.

[0047] Through the above embodiment, the technical scheme of the present application can directly observe the preheating plug module through the inspection opening matched with the position of the preheating plug module, which is convenient for the inspection personnel to inspect the preheating plug module, avoids the disassembly process of the entire shell during the inspection process, reduces the maintenance time, and improves the maintenance efficiency.

[0048] According to an example embodiment, the detection device 1 further comprises a first indicator light 17. The first indicator light 17 is provided on the shell 11 and is connected in series between the test interface 15 and the other end of the main control switch 14.

[0049] For example, the first indicator light 17 can be a visual state feedback device connected in series between the test interface 15 and the main control switch 14 in the detection device 1. Exemplarily, the first indicator light 17 is an LED lamp or a neon lamp. The detection personnel can directly reflect the power on-off state, load connection state or fault type (such as short circuit, open circuit) of the detection device 1 through the brightening or flickering of the first indicator light 17.

[0050] Through the above embodiment, the technical scheme of the present application can locate the fault link through the state of the first indicator light by setting the first indicator light between the test interface and the main control switch, thereby simplifying the fault troubleshooting process and improving the fault troubleshooting efficiency.

[0051] According to an example embodiment, the detection device 1 further comprises a second indicator light 18. The second indicator light 18 is provided on the shell 11 and is connected in series between the input end of the preheating plug circuit 13 and the other end of the main control switch 14.

[0052] The second indicator light 18 is a visual feedback device for monitoring the state of the preheating plug circuit 13 in the detection device 1 and is connected in series between the input end of the preheating plug circuit 13 and the main control switch 14. Exemplarily, the second indicator light 18 can be an LED lamp or a neon lamp. The detection personnel can directly reflect the on-off state of the preheating plug through the brightening or flickering of the second indicator light 18.

[0053] Through the above embodiment, the technical scheme of the application serially connects the second indicator lamp with the main control switch at the input end of the glow plug circuit, feeds back the working state of the glow plug circuit in real time through the second indicator lamp, and thus can confirm the fault of the glow plug circuit, simplifies the troubleshooting process, and improves the troubleshooting efficiency.

[0054] According to an example embodiment, the detection device 1 further comprises a current detection module. The current detection module is arranged at the glow plug circuit 13 to detect the current value of the glow plug circuit 13.

[0055] For example, the current detection module can be a current detection device based on electromagnetic induction or Hall effect, which can collect the current in the glow plug circuit 13 in real time. For example, the detection personnel can also manually detect the current value of the glow plug circuit 13 through a multimeter.

[0056] Through the above embodiment, the technical scheme of the application collects the current value of the glow plug in the glow plug circuit in real time through the current detection module, avoids the manual detection error of the detection personnel in detecting the glow plug current value through the traditional multimeter, improves the accuracy of current detection, and ultimately improves the detection accuracy.

[0057] According to another aspect of the application, a detection method of an engine glow plug control box is also provided. The engine glow plug control box controls the glow plug load circuit in the engine to work in power-on mode, and the detection device is used to simulate the glow plug load circuit. Figure 2 The flowchart of the detection method 1000 of the embodiment of the application is shown. According to an example embodiment, as shown in Figure 2 The detection method 1000 comprises steps S110-S140.

[0058] In step S110, the control switch is closed to turn on the engine glow plug control box to be detected.

[0059] For example, after the control switch is closed, the engine glow plug control box to be detected can obtain the power supply voltage of the external power supply, and then the engine glow plug control box to be detected is turned on.

[0060] In step S120, the engine glow plug control box to be detected is controlled to work so that the glow plug circuit of the detection device works in power-on mode.

[0061] For example, the engine glow plug control box to be detected can be controlled to output a driving signal to the glow plug circuit of the detection device, and the driving signal makes the glow plug circuit work in power-on mode. For example, the driving signal can be a constant voltage signal.

[0062] In step S130, the current value of the glow plug circuit in the power-on working process is detected.

[0063] In step S140, it is determined that the current value corresponds to the preset current threshold range within a continuous preset time, so as to complete the detection of the engine glow plug control box to be detected.

[0064] For example, the preset time can be the time required for the engine glow plug control box to be detected to complete the glow plug heating in the glow plug circuit. Illustratively, the preset time can be 5s. For example, the preset current threshold range can be the rated working current range of the glow plug in the glow plug circuit. Illustratively, the preset current threshold range can be 4-10A.

[0065] Through the above embodiment, the technical scheme of the present application controls the engine glow plug control box to be detected to perform the glow plug energization work on the glow plug circuit of the detection equipment, and confirms whether the working state of the engine glow plug control box to be detected is normal by detecting whether the current value of the glow plug circuit is within the preset current threshold range. The technical scheme of the present application simulates the glow plug load loop and monitors the current value of the glow plug circuit, simplifies the detection steps of the engine glow plug control box, and improves the detection efficiency and detection reliability.

[0066] Figure 3 A flowchart of step S120 of the detection method 1000 of the embodiment of the present application is shown. According to an example embodiment, as shown in Figure 3 Step S120 includes steps S121-S122.

[0067] In step S121, a preset high-level signal is provided to the preheating enable end of the engine glow plug control box to be detected, so as to start the preheating function of the engine glow plug control box to be detected.

[0068] For example, when the preheating enable end of the engine glow plug control box to be detected is high, the preheating function of the engine glow plug control box to be detected can be activated. Illustratively, the high-level signal is 28V high level.

[0069] In step S122, the preheating function of the engine glow plug control box to be detected is controlled to perform the glow plug circuit energization work.

[0070] Through the above embodiment, the technical scheme of the present application triggers the preheating function of the engine glow plug control box to be detected through the high-level triggering mechanism, avoids the mis-triggering situation caused by poor contact of the traditional mechanical trigger switch, and improves the reliability of the detection equipment.

[0071] Figure 4 Another flowchart of step S120 of the detection method 1000 of the embodiment of the present application is shown. According to an example embodiment, as shown in Figure 4 Step S120 includes steps S123-S124.

[0072] In step S123, the engine preheating plug control box to be tested is placed in a preset temperature environment to trigger the preheating function of the engine preheating plug control box to be tested.

[0073] For example, the engine preheating plug control box to be tested is internally provided with a temperature sensor, and when the temperature sensor detects that the ambient temperature of the engine preheating plug control box to be tested is lower than a preset temperature threshold, the preheating function of the engine preheating plug control box to be tested can be triggered. Illustratively, the preset temperature environment can be a low temperature environment of -40°C.

[0074] In step S124, the preheating plug circuit is controlled to be powered on by the preheating function of the engine preheating plug control box to be tested.

[0075] Through the above embodiments, the technical scheme of the present application places the engine preheating plug control box to be tested in a preset temperature environment, simulates the condition that the engine preheating plug control box to be tested is in the preheating function temperature trigger, activates the preheating function, covers the cold start scene in the low temperature environment test, and further detects the working condition of the engine preheating plug control box to be tested in the low temperature environment, thereby improving the reliability of the test.

[0076] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the foregoing embodiments of the present application are described in detail, those skilled in the art can still modify the technical solutions of the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An engine glow plug control box testing apparatus characterized by, The engine preheating plug control box controls the preheating plug load loop inside the engine to work, and the detection device is used for simulating the preheating plug load loop, and the detection device comprises: a shell; a power input interface arranged in the shell; a preheating plug circuit arranged in the shell, and an output end of the preheating plug circuit being grounded; a main control switch arranged in the shell, one end of the main control switch being connected to the power input interface; a test interface connected to the other end of the main control switch and an input end of the preheating plug circuit, the test interface being used for connecting the engine preheating plug control box to be detected; wherein the preheating plug circuit works under the control of the engine preheating plug control box to be detected and is powered on for a continuous preset time to detect the engine preheating plug control box to be detected.

2. The detection device of claim 1, wherein, The preheating plug circuit comprises: a circuit breaker module connected to one end of the test interface; a preheating plug module connected to the other end of the circuit breaker module; a preheating plug module support connected to the other end of the preheating plug module and grounded at the other end.

3. The detection device of claim 2, wherein, The circuit breaker module comprises a first circuit breaker, a second circuit breaker, a third circuit breaker and a fourth circuit breaker, and the first circuit breaker, the second circuit breaker, the third circuit breaker and the fourth circuit breaker are all connected to the other end of the control switch; The preheating plug module comprises a first preheating plug, a second preheating plug, a third preheating plug and a fourth preheating plug; The first preheating plug is connected in series between the first circuit breaker and the preheating plug module support; The second preheating plug is connected in series between the second circuit breaker and the preheating plug module support; The third preheating plug is connected in series between the third circuit breaker and the preheating plug module support; The fourth preheating plug is connected in series between the fourth circuit breaker and the preheating plug module support.

4. The detection device of claim 2, wherein, The shell is provided with a maintenance opening, and the position of the maintenance opening corresponds to the mounting area of the preheating plug module.

5. The detection device of claim 1, wherein, Further comprising: a first indicator lamp arranged in the shell and connected in series between the test interface and the other end of the main control switch.

6. The detection device of claim 1, wherein, Further comprising: a second indicator lamp arranged in the shell and connected in series between the input end of the preheating plug circuit and the test interface.

7. The detection device of claim 1, wherein, Further comprising: a current detection module arranged in the preheating plug circuit to detect the current value of the preheating plug circuit.

8. A method of detecting an engine glow plug control box, characterized by, The engine preheating plug control box controls the preheating plug load loop inside the engine to work, and the detection device is used for simulating the preheating plug load loop, and the detection method comprises: closing the control switch to turn on the engine preheating plug control box to be detected; controlling the engine preheating plug control box to be detected to work so that the preheating plug circuit of the detection device is powered on to work; detecting the current value of the preheating plug circuit during the powered-on working process; determining the correspondence between the current value and the preset current threshold range within a continuous preset time to complete the detection of the engine preheating plug control box to be detected.

9. The detection method according to claim 8, characterized in that, The control of the engine preheating plug control box to be detected to work so that the preheating plug circuit of the detection device is powered on to work comprises: A preset high level signal is provided to a preheating enable end of the engine preheating plug control box to be tested, so as to start the preheating function of the engine preheating plug control box to be tested. The preheating plug circuit is controlled to work by the preheating function of the engine preheating plug control box to be tested.

10. The detection method of claim 8, wherein, The engine preheating plug control box to be tested is controlled to work, so that the preheating plug circuit of the detection device works. The engine preheating plug control box to be tested is placed in a preset temperature environment, so as to trigger the preheating function of the engine preheating plug control box to be tested. The preheating plug circuit is controlled to work by the preheating function of the engine preheating plug control box to be tested.

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