Forklift power output control system and control method

Abstract

The application provides a forklift power output control system, which comprises a safety belt switch detection module for detecting the opening and closing information of a safety belt switch, a seat switch detection module for detecting the opening and closing information of a seat switch, a vehicle speed detection module for detecting vehicle speed information, a throttle pedal detection module for detecting a throttle pedal opening degree signal, and a control module, which issues an alarm signal and maintains the power output of the vehicle when the safety belt switch is closed, the vehicle speed reaches a predetermined vehicle speed, the seat switch is opened within a first time threshold, and the throttle pedal maintains the opening degree signal. When the forklift is controlled to output power, the vehicle speed signal and the throttle pedal opening degree signal are combined to determine whether the driver wants to maintain the power of the forklift, thereby reducing the complexity of the operation of the driver. The application also provides a control method of the forklift power output control system.

Description

Technical Field

[0001] This invention relates to the field of forklift technology, and more specifically, to a forklift power output control system and control method. Background Technology

[0002] When a forklift travels over uneven surfaces, the vehicle will shake violently, and the driver is very likely to be thrown from his seat.

[0003] Traditional safety control methods involve the controller cutting off power to the transmission's forward / reverse solenoids after the driver has been away from the seat for a period of time, forcibly shifting the vehicle into neutral and putting it into a fault state. To exit the fault alarm state, the driver must properly return to the seat and shift the gear back to neutral before engaging another gear.

[0004] Common forklift control systems have the following problems: First, they cannot determine whether the driver has left the seat intentionally; second, the control method that uses a single signal to determine whether the driver is not in the position cannot meet the requirements of the working conditions; third, when the driver is jolted out of the seat and the power is cut off, the driver needs to sit back in the seat correctly and shift the gear back to neutral before engaging a gear, and the vehicle cannot meet the requirement of immediately restoring power. Summary of the Invention

[0005] In view of this, the present invention provides a forklift power output control system and control method to improve the ease of operation of the forklift during power operation.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A forklift power output control system, including

[0008] A seatbelt switch detection module that detects the open / closed status of seatbelt switches;

[0009] Seat switch detection module for detecting the opening and closing information of seat switches;

[0010] Vehicle speed detection module for detecting vehicle speed information;

[0011] Accelerator pedal detection module for detecting accelerator pedal opening signal;

[0012] The system also includes a control module that, within a first time threshold after the seatbelt switch is closed, the vehicle speed reaches a predetermined speed, and the seat switch is disconnected, detects a signal indicating that the accelerator pedal is still open, issues an alarm signal, and maintains the vehicle's power output.

[0013] Preferably, in the forklift power output control system described above, the control module cancels the alarm and controls the vehicle to operate normally after detecting that the seat switch is closed.

[0014] Preferably, in the forklift power output control system described above, the control module cuts off the vehicle power output when it detects that the seat switch is off and the accelerator pedal is fully released from the depressed state.

[0015] Preferably, in the above-mentioned forklift power output control system, a forklift instrument is connected between the control module and the vehicle speed detection module. The forklift instrument is used to set the vehicle speed parameters and send the vehicle speed information detected by the vehicle speed detection module to the control module.

[0016] Preferably, in the above-mentioned forklift power output control system, the control module and the accelerator pedal module are connected to the engine ECU, and the engine ECU converts the accelerator pedal position signal into an accelerator pedal opening percentage signal.

[0017] The control method applied to the forklift power output control system described above, wherein the forklift travels at a preset speed and the forklift's actions are controlled, includes:

[0018] S1, when the seat belt switch is closed and the seat switch is open for a period of time exceeding the first time threshold, the first alarm signal is issued and the power output of the forklift is cut off;

[0019] S11: If the accelerator pedal opening signal remains present within the first time threshold after the seatbelt switch is closed and the seat switch is open, proceed to S12.

[0020] Alternatively, if the accelerator pedal opening signal changes from present to absent, execute S13 and then proceed to S1.

[0021] S12, issue the second alarm signal to maintain forklift power output;

[0022] S13, immediately cut off the forklift's power output.

[0023] Preferably, in the control method of the above-mentioned forklift power output control system, when the forklift is traveling at a preset speed, and the seat belt switch is disconnected and the seat switch is disconnected, a third alarm signal is issued and the forklift power output is cut off.

[0024] Preferably, in the control method of the forklift power output control system described above, the forklift power output includes the forklift's forward / reverse solenoid valve and the mast solenoid valve maintaining its original working state.

[0025] Preferably, in the control method of the above-mentioned forklift power output control system, the exit of the second alarm state includes:

[0026] Within the first time threshold

[0027] S121, when the seat switch is closed, the first exit action is performed, and the forklift operates normally; or

[0028] S122, when the seat switch is always off, the accelerator pedal opening signal changes from on to off, and the second exit action is executed.

[0029] The forklift power output control system provided by this invention includes a seatbelt switch detection module for detecting seatbelt switch opening / closing information; a seat switch detection module for detecting seat switch opening / closing information; a vehicle speed detection module for detecting vehicle speed information; an accelerator pedal detection module for detecting accelerator pedal opening signal; and a control module that, when the seatbelt switch is closed, the vehicle speed reaches a predetermined speed, and within a first time threshold after the seat switch is opened, detects the accelerator pedal maintaining opening signal, issues an alarm signal, and maintains vehicle power output. When controlling the forklift's power output, the combination of the seat switch and seatbelt switch is used to determine whether the driver has consciously left the seat. By combining the vehicle speed signal and the accelerator pedal opening signal, it is determined whether the driver wants to maintain forklift power, thereby avoiding the vehicle actively disconnecting power based solely on changes in driver operation due to working conditions. This reduces the frequency of power disconnection or reconnection operations required by the driver, reducing the complexity of driver operation. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 System layout diagram of the internal combustion forklift operation safety control system provided by the present invention;

[0032] Figure 2 The control flowchart is shown in the control method of the internal combustion forklift operation safety control system provided by the present invention. Detailed Implementation

[0033] This invention discloses a forklift power output control system and control method, which improves the ease of operation during forklift power operation.

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] like Figure 1 and Figure 2 As shown, Figure 1 System layout diagram of the internal combustion forklift operation safety control system provided by the present invention; Figure 2 The control flowchart is shown in the control method of the internal combustion forklift operation safety control system provided by the present invention.

[0036] This application provides an internal combustion forklift operation safety control system and a forklift power output control system, including a seat belt switch detection module for detecting seat belt switch opening and closing information; a seat switch detection module for detecting seat switch 2 opening and closing information; a vehicle speed detection module 1 for detecting vehicle speed information; an accelerator pedal detection module for detecting accelerator pedal 3 opening signal; and a control module 5. When the seat belt switch is closed, the vehicle speed reaches a predetermined speed, and within a first time threshold after the seat switch 2 is open, the control module 5 detects the accelerator pedal 3 maintaining its opening signal, issues an alarm signal, and maintains the vehicle's power output. When controlling the forklift's power output, the combination of the seat switch 2 and the seat belt switch is used to determine whether the driver has consciously left the seat. By combining the vehicle speed signal and the accelerator pedal 3 opening signal, the control module determines whether the driver wants to maintain the forklift's power, thus avoiding the vehicle actively disconnecting power based solely on changes in driver operation due to working conditions. This reduces the frequency of power disconnection or reconnection operations required by the driver, reducing the complexity of driver operation.

[0037] This internal combustion forklift operation safety control system, based on the situation where the driver leaves the seat during forklift operation, uses the forklift power cut-off fault status and vehicle speed to decelerate the forklift, while simultaneously detecting the actual opening of the accelerator pedal 3. By combining the synchronous detection of the forklift power cut-off fault status, vehicle speed, and actual accelerator opening during forklift operation, when the forklift power cut-off fault status and vehicle speed meet the requirements, the accelerator pedal is activated and the actual accelerator opening detection requirements are met, then the forklift can immediately resume power operation.

[0038] Specifically, after detecting that the seat switch is closed, control module 5 cancels the alarm and controls the vehicle to operate normally. When control module 5 detects that the seat switch 2 is open and the accelerator pedal 3 is fully released from the depressed state, it cuts off the vehicle's power output.

[0039] The control module 5 controls the vehicle based on the seat belt switch, seat switch 2, and accelerator pedal 3. In this embodiment, it specifically refers to the control of the forklift. It determines whether the driver actively leaves the seat or whether the driver is jolted off the seat due to changes in driving conditions. Therefore, the above control process occurs when the forklift is in motion and at the first time threshold when the seat switch 2 is turned on. Preferably, the first time threshold is 2 seconds. The control module determines whether an alarm needs to be triggered and whether the power output of the forklift needs to be cut off based on the changes in the vehicle state within 2 seconds of the seat switch being turned on.

[0040] Furthermore, within the first time threshold, the control module 5 detects that the accelerator pedal 3 maintains its opening signal, that is, the accelerator pedal 3 is continuously depressed and the accelerator pedal 3 opening signal is not 0. Within 2 seconds of the seat switch 3 being in the off state, it indicates that the driver has left the seat. At this time, the first alarm signal is issued, including the fault indicator light illuminating and the buzzer alarm. However, since the accelerator is always depressed, it indicates that the driver has not subjectively disconnected the forklift power. Therefore, the forklift power output is maintained, including maintaining the original working state of the vehicle's forward / reverse solenoid valve and the mast solenoid valve, which can continue to work.

[0041] The forklift also needs to have the function of exiting the alarm state. This function is determined based on whether the driver has correctly returned to the seat. Theoretically, if the driver correctly returns to the seat, the seat switch will be triggered.

[0042] If the driver correctly sits back in the seat within 2 seconds after the seat switch 2 is turned off, the buzzer will not sound and the vehicle will continue to operate normally.

[0043] If the driver does not return to the seat within 2 seconds of the seat switch 2 being turned off, and the accelerator pedal opening signal changes from on to off, the forward / reverse solenoid valve and the mast solenoid valve of the vehicle will be immediately cut off.

[0044] In this embodiment, a forklift instrument 4 is connected between the control module 5 and the vehicle speed detection module 1. The forklift instrument 4 is used to set the vehicle speed parameters and send the vehicle speed information detected by the vehicle speed detection module to the control module 5.

[0045] The control module 5 and the accelerator pedal 3 module are connected to the engine ECU 6. The engine ECU 6 converts the accelerator pedal 3 position signal into an accelerator pedal opening percentage signal.

[0046] Considering the simultaneous detection of three parameters during forklift operation: power failure status, vehicle speed, and actual throttle opening, this control system connects to both the vehicle speed sensor and the throttle pedal. To facilitate driver observation of forklift driving data, the vehicle speed sensor is connected to the forklift's display instrument to show the speed data. The forklift's instrument can set speed-related parameters, and the speed data is then sent to the controller via the CAN bus.

[0047] The controller connects to input / output devices, which synchronously connect to the forklift's instrument panel and the engine ECU. The engine ECU connects to the accelerator pedal, converting the accelerator pedal signal into a accelerator pedal opening percentage signal, which is then transmitted via the CAN bus.

[0048] The first time threshold is used as the time point for judging the driver's intention. In this embodiment, the first time threshold is set to 2 seconds.

[0049] During routine troubleshooting, 2 seconds after the seat switch is disconnected, the forklift is controlled by cutting off the vehicle's forward / reverse solenoid valve and the mast solenoid valve. Simultaneously, the first alarm signal is activated: the fault indicator light illuminates, the neutral indicator light flashes, and the buzzer sounds.

[0050] If, within 2 seconds of the seat switch being disconnected, the driver's intention is determined and the seat switch remains disconnected (i.e., the driver has not returned to the seat), and the accelerator pedal signal goes through a process from on to off, then the vehicle's forward / reverse solenoid valve and mast solenoid valve are immediately cut off.

[0051] The first alarm signal will be deactivated, as will the alarm signal after the seat switch is used in conjunction with the accelerator pedal to cut off the vehicle's power. Both will be deactivated when the driver sits back in the seat correctly and the buzzer will not sound. When the gear shift switch is moved to the neutral position, the neutral position indicator light will remain on. When the gear is re-engaged, the neutral position indicator light will turn off.

[0052] The safe speed of the forklift can be set via the forklift instrument panel. In this embodiment, the safe operating speed of the forklift is set to 4 km / h, which is the minimum speed at which the forklift can be safely controlled. When monitoring the forklift's driving safety, if the vehicle is traveling at a speed above 4 km / h and a seatbelt is detected not being fastened, the buzzer on the forklift will sound an alarm. The alarm will deactivate once the seatbelt is fastened.

[0053] During normal forklift operation, i.e. when the forklift speed is above 4 km / h, the controller detects that the forklift speed is not 0.

[0054] At this time, the controller simultaneously detects the seat belt status and the driver's seat switch status.

[0055] S1: Seatbelt closed, seat switch disconnected beyond the first time threshold.

[0056] When the seatbelt switch is in the closed state, if the seat switch is detected to be open, the seat switch may be open because the driver actively leaves or the driver is passively ejected due to vehicle movement. Therefore, a delay judgment is set. Specifically, the first time threshold of the seat switch being open is used as the general alarm mode. Two seconds after the seat switch is detected to be open, the forward / reverse solenoid valve of the vehicle and the forklift mast solenoid valve are cut off. At the same time, the first alarm signal is issued, including turning on the forklift's malfunction indicator light, flashing the neutral indicator light, sounding the buzzer, and cutting off the forklift's power output, including cutting off the forklift's forward / reverse solenoid valve and the forklift mast solenoid valve.

[0057] Within the first time threshold, the control of the forklift's working status is introduced into the exception judgment of the accelerator pedal opening signal.

[0058] When the seatbelt switch is closed, the accelerator pedal opening signal is used to determine whether the driver leaves the seat actively or is passively ejected.

[0059] At this time, within the first time threshold when the seat belt switch is closed and the seat switch is opened, specifically within 2 seconds, the following judgment is made.

[0060] S11: The first time threshold for the seat switch to disconnect is preferably within 2 seconds, when the accelerator pedal is continuously depressed.

[0061] If the forklift speed is not zero, and the accelerator pedal opening signal is always present (specifically, the accelerator pedal signal is never zero, meaning the accelerator pedal is always depressed), it can be determined that the driver is continuing to operate the forklift. Only the second alarm signal will be issued, including the malfunction indicator light illuminating and the buzzer alarm. To maintain the forklift's power output, the forward / reverse solenoid valves and the mast solenoid valve will maintain their current operating state, allowing for continued forklift control.

[0062] S12: The second alarm signal is deactivated during this process, including the driver correctly returning to the seat, the buzzer no longer sounding, and the vehicle continuing to operate normally.

[0063] When the seat belt switch is in the off state, it is determined that the seat belt was actively opened by the driver. If the seat switch is also detected to be off at the same time, the forward / reverse solenoid valve of the forklift and the forklift mast solenoid valve are immediately cut off. At the same time, a third alarm signal is issued, including turning on the forklift's malfunction indicator light, seat belt indicator light, flashing neutral position indicator light, and buzzer alarm.

[0064] With the accelerator pedal constantly depressed, further changes in throttle opening can be made.

[0065] Within the first time threshold, detect the accelerator pedal opening signal from present to absent;

[0066] S13: If the driver does not return to the seat, i.e. the seat switch remains off, and the accelerator pedal opening signal is detected to gradually decrease from on to off, it is determined that the driver is decelerating. In this case, the forward / reverse solenoid valve of the forklift is immediately cut off, and the mast solenoid valve is closed.

[0067] Exit alarm state

[0068] To exit the forklift alarm state, when the alarm sounds outside the first time threshold, the driver must correctly return to the seat; the buzzer will then stop sounding. The gear shift switch should be turned to the neutral position, and the neutral indicator light will remain on. After re-engaging the gear, the neutral indicator light will turn off. This exit procedure is the same as exiting the third alarm signal.

[0069] When the forklift alarms within the first time threshold, depending on whether the throttle is disengaged within 2 seconds, the action is divided into the first exit action in response to the second alarm signal.

[0070] If the second alarm signal is triggered by only the fault indicator light illuminating and the buzzer sounding, the first exit action is to turn off the buzzer alarm, and the vehicle can continue to operate normally.

[0071] The second exit action is for forklift status control caused by changes in the accelerator pedal opening signal when the driver has not returned to the seat. This second exit action has the same exit mechanism as the first alarm signal.

[0072] The above describes the forklift's operating status and the opening and closing operations of onboard equipment based on the seatbelt and seat switch status. Utilizing the combination of seat and seatbelt switch status resolves whether the driver has consciously left the seat. By assessing the driver's potential subjective and objective states, different control methods are applied to the vehicle's power, the forklift's forward / reverse solenoid valves, and hydraulic devices such as the forklift mast solenoid valve, reducing potential power safety hazards. By combining vehicle speed and accelerator pedal signals with different driver actions, it determines whether power should be restored under different working conditions, reducing cumbersome operations. Furthermore, the alarm system's responses under different states effectively prompt the driver to resume the necessary operations.

[0073] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A forklift power output control system, characterized in that, Applications include situations where the driver may be jolted off their seat while the forklift is in motion, including: A seatbelt switch detection module that detects the open / closed status of seatbelt switches; Seat switch detection module for detecting the opening and closing information of seat switches; Vehicle speed detection module for detecting vehicle speed information; Accelerator pedal detection module for detecting accelerator pedal opening signal; And a control module, which uses the combined information of the seat switch and seat belt switch to determine whether the driver has left the seat intentionally. When the seat belt switch is closed, the vehicle speed reaches the predetermined speed. Within the first time threshold when the seat switch is open, the accelerator pedal opening signal is detected, an alarm signal is issued, and the vehicle power output is maintained. Specifically, the control module cuts off the vehicle's power output when it detects that the seat switch is off and the accelerator pedal is fully released from the depressed state.

2. The forklift power output control system according to claim 1, characterized in that, After detecting that the seat switch is closed, the control module cancels the alarm and controls the vehicle to operate normally.

3. The forklift power output control system according to claim 1, characterized in that, A forklift instrument is connected between the control module and the vehicle speed detection module. The forklift instrument is used to set vehicle speed parameters and send the vehicle speed information detected by the vehicle speed detection module to the control module.

4. The forklift power output control system according to claim 1, characterized in that, The control module and the accelerator pedal detection module are connected to the engine ECU, and the engine ECU converts the accelerator pedal position signal into an accelerator pedal opening percentage signal.

5. A control method applied to the forklift power output control system according to claims 1-4, characterized in that, The forklift travels at a preset speed, and its actions are controlled, including: S1, when the seat belt switch is closed and the seat switch is open for a period of time exceeding the first time threshold, the first alarm signal is issued and the power output of the forklift is cut off; S11: If the accelerator pedal opening signal remains present within the first time threshold after the seatbelt switch is closed and the seat switch is open, proceed to S12. Alternatively, if the accelerator pedal opening signal changes from present to absent, execute S13 and then proceed to S1. S12, issue the second alarm signal to maintain forklift power output; S13, immediately cut off the forklift's power output.

6. The control method for the forklift power output control system according to claim 5, characterized in that, When the forklift is traveling at a preset speed, and the seatbelt switch and seat switch are disconnected, a third alarm signal is issued, and the forklift's power output is cut off.

7. The control method for the forklift power output control system according to claim 6, characterized in that, The forklift power output includes the forklift's forward / reverse solenoid valve and the mast solenoid valve, which remains in its original working state.

8. The control method for the forklift power output control system according to claim 7, characterized in that, The exit of the second alarm signal includes: Within the first time threshold S121, when the seat switch is closed, the first exit action is performed, and the forklift operates normally; or S122, when the seat switch is always off, the accelerator pedal opening signal changes from on to off, and the second exit action is executed to immediately cut off the forklift power output.

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