Engine flameout delay control circuit and working machine

Abstract

The embodiment of the utility model provides an engine flameout delay control circuit and an operation machine, and belongs to the field of vehicle control. The circuit comprises a complete machine controller, an engine controller and a flameout delay loop, the control end of the flameout delay loop is connected with the flameout delay signal output end of the complete machine controller, and the input end of the flameout delay loop is connected with a starting switch so that a self-adaptive cruise control power source signal can be accessed. The output end of the flameout delay loop is connected with the self-adaptive cruise control power signal input end of the whole machine controller and the self-adaptive cruise control power signal input end of the engine controller. The circuit can be switched on under the trigger of a flameout delay signal output by a whole machine controller, so that a self-adaptive cruise control power supply signal is continuously input into an engine controller, the operation of the engine controller is maintained, the slow speed reduction of an engine is controlled by the engine controller, a heat dissipation pump can continue to work, and the service life of the heat dissipation pump is prolonged. And the hydraulic fan is driven to cool hydraulic oil and cooling liquid.

Description

Technical Field

[0001] The utility model relates to the field of vehicle control, and particularly to an engine flameout delay control circuit and a working machine. Background Art

[0002] When the engine is running, a large amount of heat is generated, resulting in an increase in the temperature of the engine and the engine compartment. Excessive temperature will cause damage to the engine and aging of pipelines, wire harnesses, etc. in the engine compartment, shortening the service life. To avoid high temperature, the vehicle is equipped with a cooling system for heat dissipation. When the engine is running normally, the cooling system is always running, with high cooling efficiency and can meet the cooling requirements.

[0003] Currently, most vehicles adopt the strategy of turning off the engine immediately when power is cut off. After the engine is turned off immediately when power is cut off, the engine stops immediately and the cooling pump also stops working. If high-power operations are performed before shutdown, the temperatures of the hydraulic oil and the engine coolant are very high. If the cooling fan stops suddenly, this temperature cannot be quickly reduced by the cooling fan, but instead will show an upward trend due to lack of timely cooling. The hydraulic system and the engine are in an abnormal working temperature, and this will cause damage to them in the long run and reduce the service life.

[0004] When the engine is turned off immediately when power is cut off, if the engine is working in a high gear mode before stopping, the turbocharger speed is relatively high and the fuel injector injects a large amount of fuel. When the engine stops suddenly, the turbocharger speed quickly drops to zero and cannot decelerate smoothly, causing damage to the turbocharger. After the turbocharger quickly decelerates, the intake air volume decreases rapidly, and the injected fuel cannot be fully burned, resulting in carbon deposition in the cylinder and reducing the service life of the engine. Content of the Utility Model

[0005] The purpose of the embodiment of the utility model is to provide an engine flameout delay control circuit and a working machine. The engine flameout delay control circuit can be turned on under the trigger of a flameout delay signal output by the whole machine controller to keep the adaptive cruise control power signal continuously input to the engine controller and maintain the operation of the engine controller, so that the cooling pump can continue to work, drive the hydraulic fan to cool the hydraulic oil and the coolant, avoid the hydraulic system and the engine being in an abnormal working temperature, improve the service life. At the same time, after the engine is turned off, the engine controller continues to operate, enabling the engine controller to regulate the engine to slow down.

[0006] To achieve the above object, an embodiment of the present utility model provides an engine flameout delay control circuit, which includes an overall machine controller and an engine controller. The engine flameout delay control circuit further includes: a flameout delay loop, the control end of the flameout delay loop is connected to the flameout delay signal output end of the overall machine controller, the input end of the flameout delay loop is connected to the start switch to access the adaptive cruise control power signal, and the output end of the flameout delay loop is respectively connected to the adaptive cruise control power signal input end of the overall machine controller and the adaptive cruise control power signal input end of the engine controller.

[0007] According to the above technical means, the engine flameout delay control circuit can be turned on under the trigger of the flameout delay signal output by the overall machine controller to keep the adaptive cruise control power signal continuously input to the engine controller, maintain the operation of the engine controller, so that the cooling pump can continue to work, drive the hydraulic fan to cool the hydraulic oil and coolant, avoid the hydraulic system and the engine being at abnormal working temperatures, improve the service life, and at the same time, after flameout, the engine controller continues to operate, enabling the engine controller to regulate the engine to slow down gradually.

[0008] In some feasible embodiments, the flameout delay loop includes a fourth switch module, the control end of the fourth switch module is connected to the flameout delay signal output end of the overall machine controller, and the fourth switch module closes under the trigger of the flameout delay signal to turn on the flameout delay loop.

[0009] According to the above technical means, a fourth switch module directly controlled by the flameout delay signal is provided in the flameout delay loop, so that the flameout delay loop can be directly controlled by the overall machine controller, and the flameout delay time is variable and controllable, which better meets the flameout delay requirements.

[0010] In some feasible embodiments, the fourth switch module is a relay, the coil of the relay is connected to the flameout delay signal output end of the overall machine controller, and the coil is energized when there is a flameout delay signal, so that the working circuit of the relay is closed to turn on the flameout delay loop.

[0011] In some feasible embodiments, the engine flameout delay control circuit further includes:

[0012] A detection device, the output end of the detection device is connected to the input end of the overall machine controller, and is used to detect the flameout delay parameter, and the flameout delay parameter is used to judge whether flameout needs to be delayed.

[0013] According to the above technical means, the detection device can provide a judgment basis for whether flameout needs to be delayed, and provides a control basis for the overall machine controller to control the on / off of the flameout delay loop.

[0014] In some feasible embodiments, the engine flameout delay control circuit further includes:

[0015] A first power supply circuit, the output terminal of the first power supply circuit is respectively connected to the power supply terminal of the whole machine controller and the power supply terminal of the engine controller, the control terminal of the first power supply circuit is connected to the power-off delay signal output terminal of the whole machine controller, and the first power supply circuit is connected to the power supply to conduct under the trigger of the power-off delay signal to supply power to the whole machine controller and the engine controller.

[0016] According to the above technical means, the first power supply circuit is set to supply power to the whole machine controller and the engine controller during the flameout delay process, ensuring that the whole machine controller and the engine controller can perform flameout control.

[0017] In some feasible embodiments, the first power supply circuit includes a third switch module and a first diode. The positive electrode of the first diode is connected to the power-off delay signal output terminal of the whole machine controller, and the negative electrode of the first diode is connected to the control terminal of the third switch module. The third switch module closes under the trigger of the power-off delay signal to conduct the first power supply circuit.

[0018] According to the above technical means, a third switch module directly controlled by the power-off delay signal is provided in the first power supply circuit, so that the first power supply circuit can be directly controlled by the whole machine controller. After the user operates the power-off, the power supply can still be maintained under the control of the whole machine controller, and the power-off delay time is variable and controllable, which better meets the flameout delay requirements.

[0019] In some feasible embodiments, the engine flameout delay control circuit further includes:

[0020] A second power supply circuit, the output terminal of the second power supply circuit is respectively connected to the power supply terminal of the whole machine controller and the power supply terminal of the engine controller, the control terminal of the second power supply circuit is connected to the start switch, and the first power supply circuit is connected to the power supply to conduct when starting to supply power to the whole machine controller and the engine controller.

[0021] In some feasible embodiments, the second power supply circuit includes a first switch module, a third switch module and a second diode. The control terminal of the first switch module is connected to the start switch to trigger the first switch module to close when starting; the first switch module is also connected to the positive electrode of the second diode, and the negative electrode of the second diode is connected to the control terminal of the third switch module. The third switch module is triggered to close when the first switch module closes to conduct the second power supply circuit.

[0022] According to the above technical means, the first power supply circuit and the second power supply circuit share the third switch module. Since a diode can only conduct in one direction, the third switch module can be turned on under the trigger of control currents from different sources, simplifying the circuit and reducing the component cost.

[0023] In some feasible embodiments, the engine flameout delay control circuit further includes:

[0024] A starting motor control circuit, the control end of the starting motor control circuit is connected to the motor start signal output end of the whole machine controller to be turned on under the trigger of the motor start signal, so that the starting motor is powered on and operates.

[0025] The second aspect of the present application provides a construction machine, and the construction machine applies the engine flameout delay control circuit described above.

[0026] Through the above technical solution, the engine flameout delay control circuit can be turned on under the trigger of the flameout delay signal output by the whole machine controller to keep the adaptive cruise control power signal continuously input to the engine controller and maintain the operation of the engine controller, so that the cooling pump can continue to work to drive the hydraulic fan to cool the hydraulic oil and the coolant, avoiding the hydraulic system and the engine being at abnormal working temperatures, improving the service life. At the same time, after flameout, the engine controller continues to operate, enabling the engine controller to regulate the engine to slow down.

[0027] Other features and advantages of the embodiments of the present utility model will be described in detail in the subsequent specific implementation part. Description of the Drawings

[0028] The drawings are used to provide a further understanding of the embodiments of the present utility model, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the embodiments of the present utility model, but do not constitute a limitation to the embodiments of the present utility model. In the drawings:

[0029] Figure 1 is the block diagram of the engine flameout delay control circuit provided by the embodiment of the present application;

[0030] Figure 2 is the schematic diagram of the engine flameout delay control circuit provided by an embodiment of the present application;

[0031] Figure 3 is the schematic diagram of the VCU requesting the engine to downshift interaction provided by another embodiment of the present application.

[0032] Description of the Reference Numerals

[0033] D1 - First diode, D2 - Second diode, K1 - First relay, K2 - Second relay, K3 - Third relay, K4 - Fourth relay, M - Starter motor, G - Engine, S1 - Power button, F1 - First fuse, F2 - Second fuse, F3 - Third fuse, C1 - First battery, C2 - Second battery. Detailed implementation

[0034] The following will describe in detail the specific implementation of the embodiments of the present utility model in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiments of the present utility model, and is not used to limit the embodiments of the present utility model.

[0035] In the embodiments of the present utility model, unless otherwise stated, the orientation terms such as "upper, lower, left, right" usually refer to the orientation or positional relationship based on the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed when in use.

[0036] The terms "first", "second", "third", etc. are only used for distinguishing descriptions, and cannot be understood as indicating or implying relative importance.

[0037] The terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal, vertical or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0038] In addition, terms such as "substantially" and "basically" are intended to indicate that the relevant content does not require absolute precision, but can have a certain deviation. For example: "substantially equal" does not only mean absolute equality. Since it is difficult to achieve absolute "equality" in actual production and operation processes, there is generally a certain deviation. Therefore, in addition to absolute equality, "substantially equal" also includes the above-mentioned situation of having a certain deviation. Taking this as an example, in other cases, unless otherwise specified, terms such as "substantially" and "basically" have meanings similar to the above.

[0039] In the description of the present utility model, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0040] Such as Figure 1As shown in the figure, the present application provides an engine flameout delay control circuit, which includes an overall machine controller and an engine controller. The engine flameout delay control circuit further includes: a flameout delay circuit, the control end of the flameout delay circuit is connected to the flameout delay signal output end of the overall machine controller, the input end of the flameout delay circuit is connected to the start switch to access the adaptive cruise control power signal, and the output end of the flameout delay circuit is respectively connected to the adaptive cruise control power signal input end of the overall machine controller and the adaptive cruise control power signal input end of the engine controller. Thus, the engine flameout delay control circuit can be turned on under the trigger of the flameout delay signal output by the overall machine controller to keep the adaptive cruise control power signal continuously input to the engine controller and maintain the operation of the engine controller, so that the cooling pump can continue to work, driving the hydraulic fan to cool the hydraulic oil and coolant, avoiding the hydraulic system and the engine being at abnormal working temperatures, improving the service life. At the same time, after the engine is turned off, the engine controller continues to operate, enabling the engine controller to regulate the engine to slow down gradually.

[0041] In some feasible embodiments, the engine flameout delay control circuit further includes:

[0042] a detection device, the output end of the detection device is connected to the input end of the overall machine controller, and is used for detecting flameout delay parameters, and the flameout delay parameters are used to determine whether flameout needs to be delayed.

[0043] According to the above technical means, the detection device can provide a judgment basis for whether flameout needs to be delayed, providing a control basis for the overall machine controller to control the on-off of the flameout delay circuit.

[0044] In some feasible embodiments, the engine flameout delay control circuit further includes:

[0045] a first power supply circuit, the output end of the first power supply circuit is respectively connected to the power supply end of the overall machine controller and the power supply end of the engine controller, the control end of the first power supply circuit is connected to the power-off delay signal output end of the overall machine controller, and the first power supply circuit is connected to the power supply to be turned on under the trigger of the power-off delay signal to supply power to the overall machine controller and the engine controller.

[0046] According to the above technical means, the first power supply circuit is set to supply power to the overall machine controller and the engine controller during the flameout delay process, ensuring that the overall machine controller and the engine controller can perform flameout control.

[0047] In some feasible embodiments, the first power supply circuit includes a third switch module and a first diode. The positive electrode of the first diode is connected to the power-off delay signal output terminal of the whole machine controller, and the negative electrode of the first diode is connected to the control terminal of the third switch module. The third switch module is closed under the trigger of the power-off delay signal to conduct the first power supply circuit.

[0048] According to the above technical means, a third switch module directly controlled by a power-off delay signal is arranged in the first power supply circuit, so that the first power supply circuit can be directly controlled by the whole machine controller. After the user operates the power-off, the power supply can still be maintained under the control of the whole machine controller, and the power-off delay time is variable and controllable, which better meets the needs of flameout delay.

[0049] In some feasible embodiments, the engine flameout delay control circuit further includes:

[0050] A second power supply circuit, the output terminal of the second power supply circuit is respectively connected to the power supply terminal of the whole machine controller and the power supply terminal of the engine controller. The control terminal of the second power supply circuit is connected to the start switch. The first power supply circuit is connected to the power supply to conduct when starting, so as to supply power to the whole machine controller and the engine controller.

[0051] In some feasible embodiments, the second power supply circuit includes a first switch module, a third switch module and a second diode. The control terminal of the first switch module is connected to the start switch to trigger the first switch module to close when starting; the first switch module is also connected to the positive electrode of the second diode, and the negative electrode of the second diode is connected to the control terminal of the third switch module. The third switch module is triggered to close when the first switch module is closed to conduct the second power supply circuit.

[0052] According to the above technical means, the first power supply circuit and the second power supply circuit share the third switch module. Since the diode can only conduct in one direction, the third switch module can be conducted under the trigger of control currents from different sources, which simplifies the circuit and reduces the component cost.

[0053] In some feasible embodiments, the engine flameout delay control circuit further includes:

[0054] A starting motor control circuit, the control terminal of the starting motor control circuit is connected to the motor start signal output terminal of the whole machine controller to conduct under the trigger of the motor start signal, so that the starting motor is powered on and runs. The starting motor control circuit includes a second switch module and a motor connected in series. The second switch module and the motor connected in series are connected to the power supply. The control terminal of the second switch module is connected to the motor start signal output terminal of the whole machine controller. The second switch module is closed under the trigger of the motor start signal to conduct the starting motor control circuit.

[0055] Please refer toFigure 2 , this embodiment provides an engine flameout delay control circuit. In this embodiment, the fourth switch module, the first switch module, the third switch module, and the second switch module on the motor control loop all use relays. The fourth switch module corresponds to the fourth relay K4, the first switch module corresponds to the first relay K1, the third switch module corresponds to the third relay K3, and the second switch module corresponds to the second relay K2. After the relay is powered on, a certain current flows through the coil, thereby generating an electromagnetic effect, causing the armature to be attracted by the electromagnetic force and overcome the pulling force of the return spring to be attracted to the iron core, thereby driving the contact of the armature to close. Therefore, the coil of the relay is equivalent to the control end.

[0056] In this embodiment, as Figure 2 shown, in the flameout delay circuit, the coil of the fourth relay K4 is connected to the flameout delay signal output terminal of the vehicle control unit (VCU). One end of the working circuit of the fourth relay K4 is connected to the adaptive cruise control power signal (ACC) terminal of the start switch, and one end is respectively connected to the adaptive cruise control power signal input terminal of the vehicle controller and the adaptive cruise control power signal input terminal of the engine controller.

[0057] In the first power supply circuit, the power-off delay signal output terminal of the vehicle controller is connected to the positive pole of the first diode D1. The negative pole of the first diode D1 is connected to the coil of the third relay K3 and then connected to the power supply. The output terminal of the power supply is connected to one end of the working circuit of the third relay K3. The other end of the working circuit of the third relay K3 is connected to the power supply terminals of the vehicle controller and the engine controller to supply power to the vehicle controller and the engine controller. In this embodiment, the power supply uses a combined battery composed of the first battery C1 and the second battery C2.

[0058] In the second power supply circuit, the adaptive cruise control power signal terminal of the start switch is connected to one end of the working circuit of the first relay K1. The other end of the working circuit of the first relay K1 is respectively connected to the adaptive cruise control power signal input terminal of the vehicle controller, the adaptive cruise control power signal input terminal of the engine controller, and the positive pole of the second diode D2. The negative pole of the second diode D2 is connected to the coil of the third relay K3. One end of the working circuit of the third relay K3 is connected to the output terminal of the power supply. The other end of the working circuit of the third relay K3 is connected to the power supply terminals of the vehicle controller and the engine controller to supply power to the vehicle controller and the engine controller. The first power supply circuit and the second power supply circuit share the third relay K3 and the power supply. To ensure power supply safety, a power button S1 is connected in the power supply circuit for closing to connect the power supply to the power supply circuit when needed.

[0059] In the starting motor control circuit, after the motor start signal output terminal of the whole machine controller is connected to the coil of the second relay K2, it is respectively connected to the starting motor M and the negative pole of the power supply. The other end of the starting motor M is connected to one end of the working circuit of the second relay K2, and the other end of the working circuit of the second relay K2 is connected to the positive pole of the power supply. The positive and negative poles of the power supply are also connected to the engine G.

[0060] In this embodiment, the positive pole of the power supply is also connected with a fuse group, which includes a first fuse F1, a second fuse F2 and a third fuse F3. The first fuse F1 is connected to the working circuit of the third relay K3, the second fuse F2 is connected to the working circuit of the first relay K1, and the third fuse F3 is connected to the engine G.

[0061] When the construction machinery applying this embodiment starts, when the start switch is turned from off to On, the coil of the first relay K1 is powered on and the working circuit is closed. At the same time, the coil of the third relay K3 is powered on and the working circuit is closed, and the second power supply circuit is turned on, so that the whole machine controller VCU and the engine controller ECM are powered. The power-on of the first relay K1 makes the Acc signal output from the adaptive cruise control power signal terminal of the start switch be sent to the VCU and ECM through the first relay K1, so that the VCU and ECM are activated. When the start switch start is pressed, the VCU detects the ignition signal, makes the coil of the second relay K2 be powered on, the working circuit is closed, the starting motor M runs, and the engine G starts. When shutting down: when the start switch is turned from on to off, the coil of the first relay K1 is powered off and the working circuit is disconnected. The whole machine controller VCU outputs a power-off delay signal (delay) to keep the coil of the third relay K3 powered on and the first power supply circuit is turned on, so that the VCU and ECM can be continuously powered during the delay time. At the same time, the whole machine controller VCU outputs an engine shutdown delay signal when needed, the coil of the fourth relay K4 is powered on, the engine shutdown delay circuit is turned on, and the ACC signal output from the adaptive cruise control power signal terminal of the start switch is sent to the VCU and ECM through the fourth relay K4, that is, the key power of the engine controller ECM is not disconnected, so as to maintain its continuous operation. At this time, the VCU can judge whether continuous delay is needed according to the engine shutdown delay parameter detected by the detection device.

[0062] In some feasible embodiments, the flameout delay parameters mainly include two. The first one is the hydraulic oil and engine coolant temperature. After the operator cuts off the power, the detection device detects the hydraulic oil temperature and engine coolant temperature. If this temperature is higher than the set shutdown temperature T_set, the whole machine controller continuously outputs a power-off delay signal and a flameout delay signal to keep the third relay K3 and the fourth relay K4 energized. When the engine G continues to run, the cooling pump continues to work, driving the hydraulic fan to cool the hydraulic oil and coolant. When the temperatures of both are lower than the set shutdown temperature T_set, the whole machine controller stops outputting the flameout delay signal, the ACC signal disappears, and the ECM key power is disconnected, so that the engine G stops running.

[0063] The second one is the operating speed of the engine G at shutdown. After the operator cuts off the power, the detection device detects the operating speed of the engine G. If the operating speed is higher than the set low idle speed V_set of the engine G, the VCU gradually reduces the requested speed sent to the EMC via the CAN bus. As Figure 3 shown, the requested speed decreases in steps. The EMC controls the engine G to slow down slowly according to the requested speed. This process can ensure that the engine G slows down slowly, the turbocharger decelerates smoothly, and the fuel injection volume decreases slowly, reaching the best shutdown state. During this process, the VCU continuously outputs a power-off delay signal and a flameout delay signal, so as to keep the engine G running continuously. When the speed of the engine G reaches the set low idle speed V_set, the whole machine controller stops outputting the flameout delay signal, the ACC signal disappears, and the ECM key power is disconnected, so that the engine G stops running.

[0064] In some other feasible embodiments, the fourth switch module, the first switch module, the third switch module, and the second switch module on the motor control loop all adopt signal triggers. The fourth switch module corresponds to the fourth signal trigger, the first switch module corresponds to the first signal trigger, the third switch module corresponds to the third signal trigger, and the second switch module corresponds to the second signal trigger. The signal trigger is also called an air switch with a signal. It can open or close the circuit through signal triggering. It uses the logic circuit of the signal trigger to control the opening and closing of the circuit. When the input signal is at a high level, the logic circuit outputs a high level to make the execution switch turn on; when the input signal is at a low level, the logic circuit outputs a low level to make the execution switch turn off.

[0065] Taking the fourth signal trigger as an example, the input end of the logic circuit of the fourth signal trigger is connected to the flameout delay signal output end of the whole machine controller to control the execution switch to turn on when receiving the flameout delay signal; the flameout delay signal is a high-level signal.

[0066] The second aspect of the present application provides a construction machine, and the construction machine applies the engine flameout delay control circuit described above.

[0067] The optional implementation manners of the embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present utility model are not limited to the specific details in the above implementation manners. Within the technical concept scope of the embodiments of the present utility model, various simple modifications can be made to the technical solutions of the embodiments of the present utility model, and these simple modifications all fall within the protection scope of the embodiments of the present utility model.

[0068] In addition, it should be noted that, among the various specific technical features described in the above specific implementation manners, they can be combined in any appropriate manner without conflict. To avoid unnecessary repetition, the embodiments of the present utility model will not separately describe various possible combination manners.

[0069] Those skilled in the art can understand that all or part of the steps in implementing the methods of the above embodiments can be completed by instructing relevant hardware through a program. The program is stored in a storage medium, including several instructions for causing a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disc that can store program codes.

[0070] In addition, any combination can be made among various different implementation manners of the embodiments of the present utility model, as long as it does not violate the idea of the embodiments of the present utility model, and it should also be regarded as the content disclosed by the embodiments of the present utility model.

Claims

1. An engine flameout delay control circuit, comprising a whole machine controller and an engine controller, characterized in that: The engine flameout delay control circuit also includes: a flameout delay loop, a control end of the flameout delay loop is connected to the flameout delay signal output end of the whole machine controller, an input end of the flameout delay loop is connected to a start switch to access an adaptive cruise control power signal, and an output end of the flameout delay loop is respectively connected to the adaptive cruise control power signal input end of the whole machine controller and the adaptive cruise control power signal input end of the engine controller.

2. The engine shutdown delay control circuit according to claim 1, characterized in that: The flameout delay loop includes a fourth switch module, a control end of the fourth switch module is connected to the flameout delay signal output end of the whole machine controller, and the fourth switch module is closed under the triggering of the flameout delay signal to turn on the flameout delay loop.

3. The engine shutdown delay control circuit according to claim 2, characterized in that: The fourth switch module is a relay, the coil of which is connected to the ignition delay signal output terminal of the whole machine controller. When the ignition delay signal is present, the coil is energized, so that the working circuit of the relay is closed to turn on the ignition delay loop.

4. The engine shutdown delay control circuit according to claim 1, characterized in that: The engine flameout delay control circuit further includes: A detection device, the output end of which is connected to the input end of the whole machine controller, is used to detect a flameout delay parameter, and the flameout delay parameter is used to determine whether flameout needs to be delayed.

5. The engine shutdown delay control circuit according to claim 1, characterized in that: The engine flameout delay control circuit further includes: A first power supply circuit, wherein the output end of the first power supply circuit is respectively connected to the power supply end of the whole machine controller and the power supply end of the engine controller, the control end of the first power supply circuit is connected to the power-off delay signal output end of the whole machine controller, and the first power supply circuit is connected to the power supply to be turned on when triggered by the power-off delay signal to supply power to the whole machine controller and the engine controller.

6. The engine shutdown delay control circuit according to claim 5, characterized in that: The first power supply circuit includes a third switch module and a first diode, the anode of the first diode is connected to the power-off delay signal output end of the whole machine controller, the cathode of the first diode is connected to the control end of the third switch module, and the third switch module is closed when triggered by the power-off delay signal to turn on the first power supply circuit.

7. The engine shutdown delay control circuit according to claim 6, characterized in that: The engine flameout delay control circuit further includes: A second power supply circuit, wherein the output end of the second power supply circuit is respectively connected to the power supply end of the whole machine controller and the power supply end of the engine controller, the control end of the second power supply circuit is connected to the start switch, and the first power supply circuit is connected to the power supply so as to be turned on at startup to supply power to the whole machine controller and the engine controller.

8. The engine shutdown delay control circuit according to claim 7, characterized in that: The second power supply circuit includes a first switch module, a third switch module and a second diode. The control end of the first switch module is connected to the start switch to trigger the first switch module to close at startup; the first switch module is also connected to the positive electrode of the second diode, and the negative electrode of the second diode is connected to the control end of the third switch module. The third switch module is triggered to close when the first switch module is closed to turn on the second power supply circuit.

9. The engine shutdown delay control circuit according to claim 1, characterized in that: The engine flameout delay control circuit further includes: A starter motor control loop, wherein the control end of the starter motor control loop is connected to the motor start signal output end of the whole machine controller so as to be turned on under the triggering of the motor start signal, so that the starter motor is powered and operates.

10. A working machine, characterized in that: The working machine applies the engine shutdown delay control circuit described in any one of claims 1 to 9.

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