A control method for a harvesting machine diesel engine reversing fan

Abstract

The application discloses a control method of a harvesting machine diesel engine reversing fan, characterized in that: the control method comprises a manual control mode and / or an automatic control mode. According to the cooling liquid temperature of the engine, the control method of the designed relay is used to control the working of the forward and reverse fan clutch, so that the forward and reverse rotation and stop of the fan are realized. The control can realize the fan stop in the starting condition and the low-temperature condition, reduces the accessory consumption power of the fan, improves the starting ability of the whole vehicle and reduces the fuel consumption, achieves the purpose of removing the residual chippings of the radiator of the harvesting machine and avoiding high-temperature faults, and has the energy-saving function. In addition, the time of the forward rotation and the reverse rotation is automatically corrected and controlled according to the cooling water temperature of the engine, the air inlet temperature and the rotating speed, so that the automation and the intelligent level of the engine and the whole vehicle are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reversing fan control, in particular to a control method of a harvesting machine diesel engine reversing fan. BACKGROUND

[0002] The current reversing fan applied to diesel engines is mostly hydraulic reversing fan, which has high cost and poor reliability, needs manual operation and poor adaptability. For non-hydraulic reversing fan, the control means is manual activation or timing reversal, which has low automation degree, poor adaptability, high energy consumption, and no function of correcting reverse fan working time based on engine speed and intake temperature, and cannot identify working condition to control whether the fan works or not, and cannot control the fan to stop in starting condition and low temperature condition.

[0003] Characteristics of prior art:

[0004] 1. Manual operation of fan reversing or timing reversing is needed, which has low automation degree;

[0005] 2. The existing reversing fan only has two working modes of forward and reverse;

[0006] 3. It cannot be automatically controlled according to the engine intake temperature and speed.

[0007] The disclosure of the above background art content is only used to assist in understanding the concept and technical solution of the present application, and it does not necessarily belong to the prior art of the present patent application. In the absence of explicit evidence that the above content has been disclosed on the filing date of the present patent application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. SUMMARY

[0008] The present application aims to provide a control method of a harvesting machine diesel engine reversing fan, which has various control modes, accurate control and energy saving.

[0009] To this end, the present application provides a control method of a harvesting machine diesel engine reversing fan.

[0010] Preferably, the present application can also have the following technical features:

[0011] A control method of a harvesting machine diesel engine reversing fan, comprising a manual control mode and / or an automatic control mode,

[0012] One or more of the following eight conditions are selected as the use condition for activating the manual control mode: the manual button is normal, the vehicle is in neutral, the clutch is engaged, the vehicle speed is 0, the brake is released, the throttle opening is not higher than the boundary set value, the fan is not in automatic reverse state, and the manual control mode activation interval is within the set value. When the selected conditions meet the set boundary requirements, the manual button switch is pressed to enter the manual control mode to control the reversing fan.

[0013] One or more of the following ten conditions are selected as the working condition for reversing control: the engine is in operation, the vehicle is in normal working mode, the vehicle speed is not higher than the set value, the engine speed is within the boundary set range, the load is not higher than the set value, the hydraulic brake position is lower than the set value, the hydraulic temperature is not higher than the highest boundary set value, the cooling water temperature is not higher than the set value, and the fan is in a specific stage. When the reversing working condition meets the set boundary requirements and the start condition of the automatic control mode is met, the automatic control mode is entered to control the reversing fan.

[0014] Further, the start condition includes that the cooling water temperature boundary reaches a preset value and the manual control mode manual button is not activated.

[0015] Further, the reversing fan reverse control process includes one or more of the ten stage states, including:

[0016] The inactivated stage indicates that the reversing fan does not meet the start condition or there is no manual operation demand;

[0017] The waiting activation stage indicates that the fan enters a waiting time before the first reverse, which can be set according to the application. If the vehicle is parked for a long time, the waiting time for the first reverse of the fan can be appropriately shortened;

[0018] The fan forward rotation stage indicates that the reversing fan is closed, and the fan is forward rotated at this time;

[0019] The stop waiting forward switching reverse stage indicates that the reverse relay and the forward relay are both disconnected, and after the forward fan speed is reduced to 0, the reverse relay is attracted to make the reverse fan clutch switching action;

[0020] The fan normal reverse stage indicates that the fan automatic control mode when the water temperature is lower than the set temperature;

[0021] The fan emergency reverse stage indicates that the fan automatic control mode when the water temperature is greater than the set temperature;

[0022] The fan backup reverse stage indicates that the fan automatic control mode when the water temperature sensor cannot work normally;

[0023] Stop waiting for reverse switching forward stage, indicating that the reverse relay and the forward relay are both disconnected, and after the reverse fan speed drops to 0, the forward relay is attracted again to make the forward clutch switching action;

[0024] Interrupt phase, indicating that the working condition is not met or the water temperature is lower than the preset temperature, then entering the interrupt control phase;

[0025] Manual mode, indicating that the reverse function is triggered by a physical button; a certain interval time can be set between two manual modes.

[0026] Further, the control method of the automatic control mode for each state working, comprising:

[0027] Determine that there is no manual control demand, and meet the start condition and working condition of the automatic control mode, the reversing fan enters the automatic control mode;

[0028] After the engine starts, it first enters the waiting activation phase, and after the engine running time exceeds the set waiting time, it enters the stop waiting forward switching reverse phase, and after the stop reaches the set time, it enters the fan reverse running phase;

[0029] When the fan reverse rotation time exceeds the corresponding set threshold, exit the reverse rotation, enter the stop waiting reverse switching forward phase, and after the stop reaches the set time, enter the fan forward rotation phase;

[0030] When the reversing fan forward rotation time exceeds the corresponding set threshold, exit the forward rotation, enter the stop waiting forward switching reverse phase, and form a periodic forward and reverse rotation work.

[0031] Further, the actual stop duration of the stop waiting reverse switching forward / forward switching reverse phase is determined by the rotation speed correction coefficient.

[0032] Further, the engine speed is divided into several speed intervals, each speed interval corresponds to a speed correction coefficient, and then the engine speed-speed correction coefficient correspondence is uploaded to the ECU, when entering the stop waiting forward switching reverse phase, the ECU obtains the engine speed, and calls the corresponding speed correction coefficient to multiply the stop duration set value to obtain the actual stop duration of the stop waiting forward switching reverse / forward switching reverse phase.

[0033] Further, in the fan forward rotation phase, according to the cooling water temperature and the cooling water temperature sensor state, the fan forward rotation phase is divided into backup mode, emergency mode and normal mode, each mode independently sets the fan forward rotation time, and according to different working conditions, the corresponding fan forward rotation mode is entered, wherein,

[0034] Backup mode: this mode is when the water temperature sensor fails, the fan forward rotation duration is a set value w;

[0035] Emergency mode: water temperature is higher than the set value, in higher temperature state, fan forward rotation duration is set value g; Normal mode: fan forward rotation duration is set value h; in this mode, water temperature is normal, fan forward rotation time is generally set longer to enhance the cooling of the engine.

[0036] Further, in the fan forward rotation phase, the fan forward rotation actual duration is obtained by multiplying the fan forward rotation duration by the correction coefficient, and the value of the correction coefficient is determined by the intake temperature and the engine speed.

[0037] Further, if the working condition does not meet the automatic control mode or the cooling water temperature is lower than the preset temperature, the interruption phase is entered; before entering the interruption mode, the fan control includes four cases:

[0038] 1) If the fan is in the reverse rotation phase, stop the reverse rotation immediately, jump to the stop waiting for the reverse switching forward phase, and after the stop waiting for the reverse switching forward phase duration, that is, after the transition phase ends, the fan starts to rotate forward;

[0039] 2) If the fan is in the stop waiting for the forward switching reverse phase, continue the phase until exit, and then the fan maintains forward rotation;

[0040] 3) If the fan is in the stop waiting for the reverse switching forward phase, the fan needs to be controlled by the ECU to return to forward rotation, or the fan is completely stopped and then enters the forward rotation;

[0041] 4) If the fan is in the forward rotation phase, the fan continues to maintain forward rotation.

[0042] Further, the manual control mode working control method comprises:

[0043] Before entering the manual mode, the fan control has four cases:

[0044] 1) If the fan is in the forward rotation phase; if the manual control mode is triggered, the fan stops forward rotation immediately, jumps to the stop waiting for the forward switching reverse phase and continues for a set threshold time. That is, after the transition phase ends, the fan enters the reverse control phase and starts to rotate reversely until the manual mode is exited;

[0045] 2) If the fan is in the stop waiting for the forward switching reverse phase, continue the phase until exit, and then enter the reverse phase and start to rotate reversely until the manual mode is exited;

[0046] 3) If the fan is in the stop waiting for the reverse switching forward phase, the fan can return to reverse rotation by application setting, or the fan is completely stopped and then enters the reverse rotation;

[0047] 4) If the fan is in the reverse phase, that is, the fan continues to reverse.

[0048] The beneficial effects of this invention compared to the prior art include:

[0049] 1. Improve the automation and intelligence level of the engine. Based on the coolant temperature, speed and intake air temperature, the diesel engine can automatically calculate and output control signals through advanced control logic methods to control the forward and reverse relays of the fan, realize the fan reversing function, and correct the running time of the forward and reverse fans according to the working conditions.

[0050] 2. In terms of energy conservation and environmental protection: When the engine temperature is low, the fan is controlled to not run, reducing the fan's power consumption, thereby reducing fuel consumption and achieving energy saving and fuel efficiency.

[0051] 3. Regarding vehicle starting capability: During vehicle starting, the fan is controlled to not rotate, reducing the fan's power consumption during the starting process and improving starting capability.

[0052] 4. This application proposes to control the operation of the forward and reverse fan clutches by designing a relay control method based on the engine coolant temperature, thereby realizing the forward and reverse rotation and stopping of the fan; and to achieve fan stopping control under starting conditions and low temperature conditions, reducing the power consumption of fan accessories, improving the starting ability of the whole vehicle and reducing fuel consumption, achieving the purpose of removing debris from the radiator of the harvesting machinery to avoid high temperature failure, and also having energy-saving function; in addition, the forward and reverse rotation time is automatically corrected and controlled according to the engine coolant temperature, intake air temperature and speed, thereby improving the automation and intelligence level of the engine and the whole vehicle. Attached Figure Description

[0053] Figure 1 This is the control flowchart of the present invention. Detailed Implementation

[0054] The present invention will now be described in further detail with reference to specific embodiments and the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope or application of the present invention.

[0055] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein the same reference numerals denote the same parts unless otherwise specifically stated.

[0056] like Figure 1 The method for controlling the reversing fan of a harvesting machine diesel engine, as shown, includes a manual control mode and / or an automatic control mode.

[0057] One or more of eight conditions are selected as a use condition for activating the manual control mode, the eight conditions being: the manual button is normal (not stuck), the vehicle is in neutral, the clutch is engaged, the vehicle speed is 0, the brake is released, the throttle opening is not higher than a boundary set value, the fan is not in automatic reverse state, and a manual control mode activation interval is within a set value (the manual button is invalid within the interval), and when the selected conditions meet the set boundary requirements, the manual control mode is entered to control the reversing fan to work;

[0058] One or more of ten conditions are selected as a working condition for the reverse control, the ten conditions being: the engine is in operation, the vehicle is in normal working mode, the vehicle speed is not higher than a set value, the engine speed is within a boundary set range, the load is not higher than a set value, the gear is lower than a set value, the hydraulic temperature is not higher than a highest boundary set value, the cooling water temperature is not higher than a set value, and the fan is in a specific stage (the cooling water temperature change rate is not higher than a boundary set value), and when the reverse working condition meets the set boundary requirements and the start condition of the automatic control mode is met, the automatic control mode is entered to control the reversing fan to work, and specifically, the start condition includes that the cooling water temperature boundary reaches a preset value and the manual control mode manual button is not activated (i.e., there is no manual mode demand).

[0059] In the foregoing manual control mode, there are four operation modes of the manual button, including an inhibited mode, a point press mode, a long press mode, and a point press + long press mode, wherein the inhibited mode is to inhibit the manual control mode; the point press mode is to press the button, and when the button is released, the fan starts to reverse and continuously operates for a set time; the long press mode is to press the button, and the fan reverses; when the button is released, the fan stops reversing; and the point press + long press mode is compatible with the long press mode and the point press mode. More specifically, the manual control mode further includes failure management of the stuck fault of the manual button, i.e., when the manual button is pressed for more than a set time, the stuck fault is triggered, and before the stuck fault is recovered, the fan cannot activate the manual control mode.

[0060] The forward and reverse control process of the reversing fan includes ten stage states, such as:

[0061] The inactivated stage indicates that the reversing fan does not meet the start condition or there is no manual operation demand;

[0062] The waiting activation stage indicates a waiting time before the first reversing of the fan, and the waiting time can be set according to the application, and if the vehicle is parked for a long time, the waiting time for the first reversing of the fan can be appropriately shortened;

[0063] The fan forward rotation stage indicates that the reversing fan is closed, and at this time, the fan rotates forward;

[0064] Stop (waiting for reverse switching forward) indicates that the reverse relay and the forward relay are both disconnected, and the reverse fan speed is reduced to 0 before the forward relay is attracted, so that the forward clutch switching action is performed;

[0065] Fan normal reverse stage indicates that the water temperature is lower than the set temperature, and the fan automatic control mode is automatically controlled;

[0066] Fan emergency reverse stage indicates that the water temperature is greater than the set temperature, and the fan automatic control mode is automatically controlled;

[0067] Fan backup reverse stage indicates that the water temperature sensor cannot work normally, and the fan automatic control mode is automatically controlled;

[0068] Stop (waiting for reverse switching forward) indicates that the reverse relay and the forward relay are both disconnected, and the reverse fan speed is reduced to 0 before the forward relay is attracted, so that the forward clutch switching action is performed;

[0069] The interruption stage indicates that the working condition is not met or the water temperature is lower than 65℃, which can also be 50℃, 60℃, 70℃, 80℃, etc. According to different needs, the water temperature value is set, and then the interruption control stage is entered;

[0070] Manual mode indicates that the reverse function is triggered by a physical button; a certain interval time can be set between two manual modes.

[0071] The 10 stages of the reversing fan can be divided into 6 modes and 4 working states, wherein the 6 modes include waiting activation mode, normal reverse, emergency reverse, backup reverse, interruption mode and manual mode, and the 4 working states include stop (waiting for forward switching reverse), fan reverse running, stop (waiting for reverse switching forward) and fan forward running.

[0072] Based on the above, the automatic control mode for the control method of each state working includes:

[0073] Determine that there is no manual control demand, and the starting condition and working condition of the automatic control mode are met, and the reversing fan enters the automatic control mode;

[0074] After the engine starts, it first enters the waiting activation stage, and then enters the stop waiting forward switching reverse stage after the engine running time exceeds the set waiting time, and then enters the fan reverse running stage after the stop reaches the set time.

[0075] In the waiting activation stage, the fan can be in forward rotation or stop state, and the stop state is the energy saving mode.

[0076] The stop duration of the stop waiting forward switching reverse stage is multiplied by the rotation speed correction coefficient to calculate the final stop time, and the rotation speed correction coefficient is obtained by searching a two-dimensional curve.

[0077] The standby waiting reverse switching forward phase is a transition phase for the fan to change from forward to reverse, and is set considering the forward-reverse clutch switching of the fan, mainly to ensure the reliability of the fan and the gear train. In this phase, the forward and reverse relays are both open, the two clutches of the fan are in disengaged state and remain for a set time, and after the forward fan speed drops to 0, the reverse control relay is allowed to enter the reverse phase.

[0078] The fan reverse running phase includes backup mode, emergency mode and normal mode, each reverse mode independently sets the fan reverse time, and enters the corresponding fan reverse mode according to different working conditions, wherein,

[0079] Backup mode: When the cooling water temperature sensor fails, the fan reverse duration is a set value p, and the set water temperature value is reached;

[0080] Emergency mode: The cooling water temperature is higher than the set value (generally in a higher temperature state), and the fan reverse duration is a set value t; in this mode, the fan reverse time is generally set to be short; but the cycle frequency of the fan forward and reverse rotation is higher;

[0081] Normal mode: The fan reverse duration is a set value s; in this mode, the cooling water temperature is lower than the set threshold, and the fan reverse time is generally set to be short.

[0082] When the fan reverse time exceeds the corresponding set threshold of each mode, the reverse is exited and the standby waiting reverse switching forward phase is entered, and after the standby reaches the set time, the fan forward phase is entered;

[0083] The standby waiting reverse switching forward phase is a transition phase for the fan to change from reverse to forward, and is set considering the forward-reverse clutch switching of the fan, mainly to ensure the reliability of the fan and the gear train. In this phase, the forward and reverse relays are both open, the two clutches of the fan are in disengaged state and remain for a set time, and after the reverse fan speed drops to 0, the forward control relay is allowed to enter the forward phase.

[0084] The standby waiting reverse switching forward phase is a transition phase for the fan to change from reverse to forward, and is set considering the forward-reverse clutch switching of the fan, mainly to ensure the reliability of the fan and the gear train. In this phase, the forward and reverse relays are both open, the two clutches of the fan are in disengaged state and remain for a set time, and after the reverse fan speed drops to 0, the forward control relay is allowed to enter the forward phase.

[0085] In the above, the stall duration setting value is an adjustable value, which is usually determined and does not change during the entire operation of the reversing fan in the conventional reversing fan control, and the stall duration cannot be automatically adjusted according to the change of the engine speed, resulting in the same stall duration of the reversing fan at high engine speed and low engine speed, and it is difficult to achieve accurate control of the reversing fan. In the embodiment, first, the engine speed is divided into several speed intervals, such as 100 rpm for each speed interval, and each speed interval corresponds to a speed correction coefficient, which is greater than 0, then the engine speed-speed correction coefficient corresponding relationship is uploaded to the ECU, and then the stall duration setting value of the stall waiting positive switching reverse phase is associated with the engine speed; when entering the stall waiting positive switching reverse phase, the ECU acquires the engine speed, and the corresponding speed correction coefficient is called to multiply the stall duration setting value to obtain the actual stall duration of the stall waiting positive switching reverse phase / stall waiting reverse switching positive phase. For example, if the called speed correction coefficient is 1, the actual stall duration of the stall waiting positive switching reverse phase is the setting value, and if the speed correction coefficient is less than 1, the actual stall duration of the stall waiting positive switching reverse phase is the corresponding multiple of the setting value. The two-dimensional curve is obtained from the corresponding relationship of the engine speed-speed correction coefficient.

[0086] According to the cooling water temperature and the cooling water temperature sensor state, the fan forward rotation phase is divided into backup mode, emergency mode and conventional mode, and the fan forward rotation time is independently set in each mode. According to different working conditions, the corresponding fan forward rotation mode is entered, wherein,

[0087] Backup mode: this mode is when the water temperature sensor fails, the fan forward rotation duration is the setting value w;

[0088] Emergency mode: when the water temperature is higher than the setting value, the fan forward rotation duration is the setting value g; in this mode, the fan forward rotation time is generally set to be short, so as to enhance the cooling of the cooling water temperature by frequent reversing;

[0089] Conventional mode: the fan forward rotation duration is the setting value h; in this mode, the water temperature is normal, and the fan forward rotation time is generally set to be long, so as to enhance the cooling of the engine;

[0090] When the reversing fan forward rotation time exceeds the corresponding setting threshold of each mode, the forward rotation is exited and the stall waiting positive switching reverse phase is entered, forming a periodic forward and reverse rotation work.

[0091] In the fan forward rotation phase, when calculating the actual duration of fan forward rotation, the intake temperature and engine speed are considered to correct the duration of fan forward rotation. The actual duration of fan forward rotation is obtained by multiplying the set value of the duration of fan forward rotation by the correction coefficient, and the correction coefficient is obtained by three-dimensional map table. A three-dimensional map is established based on the intake temperature and engine speed to determine the correction coefficient corresponding to the intake temperature value and engine speed value. Upload the three-dimensional map to the ECU. When the fan enters the fan forward rotation phase from the reverse rotation waiting forward rotation phase, the ECU obtains the intake temperature and engine speed at this time, and according to the intake temperature value and engine speed value, the corresponding correction coefficient is obtained from the three-dimensional map. The actual duration of fan forward rotation is obtained by multiplying the set value of the duration of fan forward rotation by the correction coefficient. In this embodiment, the duration of fan forward rotation is related to the intake temperature and engine speed, and the correction coefficient corresponding to the intake temperature value and engine speed value is used as a multiple of the set value of the duration of fan forward rotation to determine the final actual duration of fan forward rotation, thereby improving the control accuracy of the reversing fan.

[0092] In the above technical solution, if the working condition does not meet the automatic control mode or the cooling water temperature is lower than 65℃, the water temperature can also be 50℃, 60℃, 70℃, 80℃, etc. According to different needs, the water temperature is set, and then the interruption phase is entered. Before entering the interruption mode, there are four cases of fan control:

[0093] 1) If the fan is in the reverse rotation phase, stop the reverse rotation immediately, and jump to the stop waiting reverse rotation forward rotation phase. After the duration of the stop waiting reverse rotation forward rotation phase, the fan starts to rotate forward.

[0094] 2) If the fan is in the stop waiting forward rotation reverse rotation phase, continue the phase until it exits, and then the fan maintains forward rotation.

[0095] 3) If the fan is in the stop waiting reverse rotation forward rotation phase, the fan needs to be controlled by the ECU to return to forward rotation, or the fan is completely stopped and then enters forward rotation.

[0096] 4) If the fan is in the forward rotation phase, the fan continues to maintain forward rotation.

[0097] Based on the above automatic control mode for working control method of each state, the manual control mode working control method includes:

[0098] Before entering the manual mode, there are four cases of fan control:

[0099] 1) If the fan is in the forward rotation stage, if the manual control mode is triggered, the fan will stop forward rotation immediately, jump to the stop rotation waiting for forward to reverse stage and continue for a set threshold time. That is, after the transition stage ends, the fan enters the reverse control stage and starts reverse rotation until the manual mode is exited.

[0100] 2) If the fan is in the stop rotation waiting for forward to reverse stage, continue the stage until the exit, then enter the reverse stage and start reverse rotation until the manual mode is exited.

[0101] 3) If the fan is in the stop rotation waiting for reverse to forward stage, the fan can return to reverse rotation by applying settings, or the fan can be completely stopped before entering reverse rotation.

[0102] 4) If the fan is in the reverse rotation stage, the fan continues to maintain reverse rotation.

[0103] In the above scheme, the fan forward and reverse rotation control relays are involved in control, and only one of them can work at the same time. In the stop rotation stage during the forward and reverse rotation mode switching process, both relays are in the open state. In the starting condition or low temperature condition, the two relays can be set to the open state, so that the fan does not work, thereby saving energy. For example, when the cooling water temperature is lower than 65°C, it belongs to the low temperature condition.

[0104] Those skilled in the art will recognize that numerous modifications can be made to the above description while still falling within the scope of the application. The examples and figures are merely used to describe one or more specific embodiments.

[0105] While there have been described herein the principles of the application in connection with specific embodiments thereof, it is to be understood that various changes and modifications can be made to the described embodiments without departing from the spirit of the application. Furthermore, it is to be understood that the application can be adapted to any of the specific environments and / or conditions without departing from the central teachings of the application. Therefore, the application is not to be limited to the specific embodiments disclosed herein, but rather only to the extent allowed by the appended claims, and equivalents thereof.

Claims

1. A control method for a harvesting machine diesel engine reversing fan, characterized in that: The control mode includes a manual control mode and / or an automatic control mode, One or more of the following conditions is selected as a condition for activating the manual control mode: the manual button is normal, the gear is in neutral, the clutch is engaged, the vehicle speed is 0, the brake is released, the throttle opening is not higher than the boundary set value, the fan is not in the automatic reverse state, and the manual control mode is activated within the set value. When the selected condition meets the set boundary requirement, the manual button switch is pressed to enter the manual control mode to control the reversing fan. One or more of the following conditions is selected as a working condition: the reverse control is normal, the engine is in operation, the vehicle is in normal working mode, the vehicle speed does not exceed the set value, the engine speed is within the boundary set range, the load does not exceed the set value, the hydraulic gear is lower than the set value, the hydraulic temperature is not higher than the highest boundary set value, the cooling water temperature does not exceed the set value, and the cooling water temperature change rate does not exceed the boundary set value. When the reverse working condition meets the set boundary requirement and the start condition of the automatic control mode is met, the automatic control mode is entered to control the reversing fan. The control method of the automatic control mode for each state includes: Determine that there is no manual control demand, and the start condition and the working condition of the automatic control mode are met, and the reversing fan enters the automatic control mode; After the engine starts, it first enters the waiting activation stage, and after the engine operating time exceeds the set waiting time, it enters the stop waiting reverse switching forward stage, and after the stop reaches the set time, it enters the fan reverse running stage; When the fan reverse time exceeds the corresponding set threshold, exit the reverse and enter the stop waiting reverse switching forward stage, and after the stop reaches the set time, enter the fan forward stage; When the reversing fan forward time exceeds the corresponding set threshold, exit the forward and enter the stop waiting forward switching reverse stage, forming a periodic forward and reverse work.

2. A control method for a harvesting machine diesel engine reversing fan as claimed in claim 1, characterized in that: The start condition includes a cooling water temperature boundary reaching a preset value and a manual control mode manual button not being activated.

3. A control method for a harvesting machine diesel engine reversing fan as claimed in claim 1, characterized in that: The forward and reverse control process of the reversing fan includes one or more of the 10 stage states, including: Unactivated stage, indicating that the reversing fan does not meet the start condition or has no manual operation demand; Waiting activation stage, indicating that the fan enters the waiting time before the first reverse, which can be set according to the application. If the vehicle is parked for a long time, the waiting time for the first reverse work of the fan can be appropriately shortened; Fan forward stage, indicating that the reversing fan is closed, and the fan is forward at this time; Stop waiting forward switching reverse stage, indicating that the reverse relay and the forward relay are both disconnected, and after the forward fan speed drops to 0, the reverse relay is attracted to switch the action of the reverse fan clutch; Fan normal reverse stage, indicating that the fan automatic control mode when the water temperature is lower than the set temperature; Fan emergency reverse stage, indicating that the fan automatic control mode when the water temperature is greater than the set temperature; Fan backup reverse stage, indicating that the fan automatic control mode when the water temperature sensor cannot work normally; The stop waiting reverse switching forward phase indicates that the reverse relay and the forward relay are both disconnected, and the forward clutch switching action is performed after the reverse fan rotating speed is reduced to 0. The interruption phase indicates that the working condition is not met or the water temperature is lower than the preset temperature, and then the interruption control phase is entered. The manual mode indicates that the reverse function is triggered by using a physical button, and a certain interval time can be set between two manual modes.

4. A control method for a harvesting machine diesel engine reversing fan as claimed in claim 1, characterized in that: The actual stop duration of the stop waiting reverse switching forward / forward switching reverse phase is determined by the rotating speed correction coefficient.

5. A control method for a harvesting machine diesel engine reversing fan as claimed in claim 4, characterized in that: The engine rotating speed is divided into several rotating speed intervals, each rotating speed interval corresponds to a rotating speed correction coefficient, and then the engine rotating speed-rotating speed correction coefficient correspondence is uploaded to the ECU. When entering the stop waiting reverse switching forward phase, the ECU obtains the engine rotating speed, and the corresponding rotating speed correction coefficient is called to multiply the stop duration setting value to obtain the actual stop duration of the stop waiting reverse switching forward / forward switching reverse phase.

6. A control method for a harvesting machine diesel engine reversing fan as claimed in claim 1, characterized in that: In the fan forward rotating phase, the fan forward rotating phase is divided into backup mode, emergency mode and normal mode according to the cooling water temperature and the cooling water temperature sensor state, and the fan forward rotating time is independently set in each mode. According to different working conditions, the corresponding fan forward rotating mode is entered, wherein, The backup mode: when the water temperature sensor fails, the fan forward rotating duration is a set value w; The emergency mode: when the water temperature is higher than the set value and is in a higher temperature state, the fan forward rotating duration is a set value g; The normal mode: the fan forward rotating duration is a set value h.

7. A control method for a harvesting machine diesel engine reversing fan as claimed in claim 1, characterized in that: In the fan forward rotating phase, the actual duration of the fan forward rotating is obtained by multiplying the set value of the fan forward rotating duration by the correction coefficient, and the value of the correction coefficient is determined by the intake temperature and the engine rotating speed.

8. A control method for a harvesting machine diesel engine reversing fan as claimed in claim 1, characterized in that: If the working condition is not met and the cooling water temperature is lower than the preset temperature, the interruption phase is entered. Before entering the interruption mode, the fan control includes four cases: 1) If the fan is in the reverse rotating phase, the reverse rotation is immediately stopped, and the stop waiting reverse switching forward phase is jumped to. After the duration of the stop waiting reverse switching forward phase, the transition phase is ended, and the fan starts to rotate forward; 2) If the fan is in the stop waiting reverse switching forward phase, the phase is continued until the fan exits, and then the fan maintains forward rotation; 3) If the fan is in the stop waiting reverse switching forward phase, the fan needs to be controlled by the ECU to return to forward rotation, or the fan is completely stopped and then enters forward rotation; 4) If the fan is in the forward rotating phase, the fan continues to maintain forward rotation.

9. A control method for a harvesting machine diesel engine reversing fan as claimed in claim 1, characterized in that: The manual control mode working control method includes: Before entering the manual mode, the fan control includes four cases: 1) If the fan is in the forward rotating phase, the fan is immediately stopped and jumps to the stop waiting reverse switching forward phase if the manual control mode is triggered, and the phase is continued for a set threshold time. That is, after the transition phase is ended, the fan enters the reverse control phase and starts to rotate reversely until the manual mode is exited. 2) If the fan is in the deceleration waiting for forward switch reverse phase, continue the phase until exit, then enter the reverse phase, start reverse, until exit manual mode; 3) If the fan is in the deceleration waiting for reverse switch forward phase, need to apply settings, the fan can return to reverse, or the fan can be completely stopped before entering reverse; 4) If the fan is in the reverse phase, the fan continues to maintain reverse.

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