Safety control method for sensing existence of operator

Abstract

The safety control method is based on a safety control system, and the safety control system comprises an instrument, a controller, a safety belt switch, a hand brake switch, a seat switch, a descending valve, a lifting valve and a reversing valve. The instrument is used for displaying states of the safety belt switch, the hand brake switch and the seat switch; the controller is used for controlling the descending valve, the lifting valve and the reversing valve; the safety control system further comprises a rear departure position inductive switch, the rear departure position inductive switch is arranged on the seat, and the rear departure position inductive switch and the seat switch jointly control power output of the vehicle and output of the lifting hydraulic system. According to the control method, a back departure position sensing switch is additionally arranged and is combined with a seat switch to control power output and lifting hydraulic system output of the vehicle, so that existence sensing of an operator can be realized, and millisecond-level cut-off response of the power and hydraulic system can be realized once the operator leaves a seat area; therefore, the safety in the operation process is guaranteed, and the probability of accidents is reduced.

Description

Technical Field

[0001] The present invention relates to the field of vehicle driving technology, and in particular to a safety control method for operator presence perception. Background Art

[0002] The OPS safety protection system is the Operator Presence Sensing system. When the driver is not in the normal operating position, the vehicle cannot be powered. Even if the load loading and unloading control device is operated, the mast should not tilt and the fork frame should not move. It effectively reduces the risk of forklift operation and provides safety protection for the operator.

[0003] At present, the lifting and lowering functions of internal combustion forklifts are usually controlled by the controller by detecting the seat switch signal to control the opening and closing of the solenoid valve. When a person leaves the seat, the controller detects the seat disconnection signal and cuts off the hydraulic valve and power output after 1.5 seconds. The specific reasons why OPS control chooses to cut off the valve control output in 1.5 seconds are as follows: a. Short-term cut-off: When driving on a bumpy road, the seat switch will be disconnected frequently. If there is no delayed disconnection setting, the driving power will be frequently disconnected and the lifting operation will be frequently stuck, resulting in low efficiency; b. Cutting off after a long time: After leaving the seat, the forklift can still be controlled, and safety cannot be met. Considering the above, 1.5 seconds is a more appropriate choice. Take descent as an example: according to the descent speed of 400mm / s, 1.5 seconds minus the time to leave the seat to trigger the joystick (calculated as 0.5 seconds), a total of 400mm is dropped in 1 second (the actual descent speed of the forklift may be faster). When the operator violates the rules by not wearing a seat belt, leans forward, or the seat belt breaks and flies out of the cab in an accident, the limbs and clothing can easily trigger the joystick by mistake, causing the mast fork to rise or fall, resulting in very serious consequences. The drive is also disconnected 1.5 seconds after leaving the seat, so if the person continues to step on the accelerator pedal after leaving the seat, the vehicle will still accelerate. According to the forklift speed of 15km / h, the vehicle can continue to accelerate for 6.25 meters in 1.5 seconds before braking to slow down, which poses a safety hazard and easily leads to safety accidents. Summary of the invention

[0004] In order to overcome the defects in the above-mentioned prior art, the purpose of the present invention is to provide a safety control method for operator presence perception, which can realize the perception of the operator's presence and achieve millisecond-level cut-off response of the power and hydraulic systems once the person leaves the seat area by adding a rear back departure sensing switch to jointly control the vehicle's power output and lifting hydraulic system output with the seat switch, thereby ensuring safety during operation and reducing the probability of accidents, which is conducive to the promotion and application of the above-mentioned operator presence perception safety control system in the field of vehicle control technology.

[0005] In order to achieve the above-mentioned invention objectives, the present invention adopts the following technical solutions: based on a safety control system, the safety control system includes an instrument, a controller, a seat belt switch, a handbrake switch, a seat switch, a descending valve, a lifting valve and a reversing valve, the instrument is used to display the status of the seat belt switch, the handbrake switch and the seat switch; the controller is used to control the descending valve, the lifting valve and the reversing valve; the seat belt switch is used to identify whether the operator is wearing a seat belt; the handbrake switch is used to identify whether the operator has lowered the handbrake; the seat switch is used to identify whether the operator has left the seat; the safety control system also includes a back departure sensing switch, the back departure sensing switch is used to identify whether the operator's posture is correct, and the back departure sensing switch is arranged on the seat and the back departure sensing switch and the seat switch jointly control the vehicle's power output and lifting hydraulic system output.

[0006] As a preferred solution of the present invention, when the handbrake is pulled up, the handbrake switch is closed, and the operator sits on the seat, the seat switch is closed, and the forklift can be started.

[0007] As a preferred solution of the present invention, an alarm is integrated in the instrument to remind the operator that he / she is not wearing a seat belt; if the operator is not wearing a seat belt, the seat belt switch is in a disconnected state, and the alarm sounds.

[0008] As a preferred solution of the present invention, the alarm is any one or more combinations of photoelectric alarm or sound alarm.

[0009] As a preferred solution of the present invention, when the seat switch and the back-out-of-position sensing switch are both closed, the operator can control the lifting of the forklift normally; when the operator leaves the seat, the seat switch is disconnected, and the back-out-of-position sensing switch is still in a closed state, the lifting valve is disconnected after 1.5 seconds, and the lifting cannot be controlled; if the lifting function of the forklift needs to be controlled again, the operator needs to re-determine the sitting posture so that the seat switch and the back-out-of-position sensing switch are both in a closed state.

[0010] As a preferred solution of the present invention, if the operator sits back in the seat within 1.5 seconds and the seat switch is in a closed state, the lifting valve control will not be disconnected, thereby ensuring smooth operation on bumpy roads.

[0011] As a preferred solution of the present invention, if the operator leans forward and causes the back-out-of-position sensing switch to be disconnected, and the operator is still on the seat and the seat switch is in a closed state, the forklift can continue to be operated to rise and fall.

[0012] As a preferred solution of the present invention, if the operator leaves the seat, the seat switch and the back-off-position sensing switch are both in a disconnected state, and the forklift cannot be controlled to rise or fall, and the operator's sitting posture needs to be re-determined.

[0013] As a preferred solution of the present invention, the seat switch is installed at the bottom of the seat.

[0014] As a preferred solution of the present invention, the back-out-of-position sensing switch is installed on the back of the seat and is arranged directly opposite to the back of the operator.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: a safety control method for operator presence perception in the present invention is implemented based on a safety control system, in which a rear back-out-of-position sensing switch is added to the safety control system so that the rear back-out-position sensing switch and the seat switch work together, the seat switch can identify whether the operator is sitting on the seat, and the rear back-out-position sensing switch can identify the operator's sitting posture or the distance between the operator and the rear back-out-position sensing switch, when the road is bumpy or the operator leaves the seat instantaneously, the system can avoid the phenomenon of vehicle disconnection, thereby ensuring that the forklift can operate stably and safely, and the rear back-out-position sensing switch and the seat switch can realize the presence perception of the operator and realize the millisecond-level cut-off response of the power and hydraulic systems once the operator leaves the seat area, thereby ensuring the safety of the operator during the operation and reducing the probability of accidents, which is conducive to the promotion and application of the above-mentioned safety control method for operator presence perception on vehicles such as forklifts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a safety control system for operator presence perception in an embodiment of the present invention; Figure 2 It is a flowchart of a safety control method for operator presence perception in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0019] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] In the prior art, when the operator violates the rules by not wearing a seat belt, leans forward, or the seat belt breaks and flies out of the cab in an accident, the limbs and clothing can easily trigger the joystick by mistake, causing the mast fork to rise or fall, resulting in very serious consequences. The drive is also disconnected 1.5 seconds after leaving the seat, so if the person continues to step on the accelerator pedal after leaving the seat, the vehicle will still accelerate. According to the forklift speed of 15km / h, the vehicle can continue to accelerate for 6.25 meters in 1.5 seconds before braking to slow down, which poses a safety hazard and easily leads to safety accidents.

[0021] Embodiment: In order to solve the above technical problems, Figure 1 to Figure 2As shown, a safety control method for operator presence perception in this embodiment is based on a safety control system. The above safety control system is mainly composed of an instrument, a controller, a seat belt switch, a handbrake switch, a seat switch, a descending valve, a lifting valve and a reversing valve. The instrument is the "sense" of the safety control system, responsible for real-time monitoring and collecting key process variables, such as displaying the status of the above seat belt switch, the above handbrake switch and the above seat switch. The controller is the "brain" of the safety control system, which is used to control the above descending valve, the above lifting valve and the above reversing valve. The function of the above seat belt switch is to detect whether the seat belt is correctly fastened. When the seat belt is not fastened, the seat belt switch is disconnected, triggering the vehicle's alarm system to remind the operator to put on the seat belt to ensure safety. The above handbrake switch is used to detect whether the handbrake is activated, which can be used here to identify whether the operator has put down the handbrake. The above seat switch is used to detect whether the operator is sitting on the seat. In order to solve the technical problems existing in the prior art, the safety control system in this embodiment is also provided with a rear back out of position sensing switch, which is used to identify whether the operator's posture is correct, and the rear back out of position sensing switch is arranged on the seat and the rear back out of position sensing switch and the seat switch jointly control the vehicle's power output and the lifting hydraulic system output.

[0022] like Figure 1 As shown, in this embodiment, by adding a rear-back out-of-position sensing switch, if the lifting function of the internal combustion forklift is to be controlled, the specific operation method is: pull up the handbrake, the above-mentioned handbrake switch (S2) is closed, the operator sits on the seat, and the above-mentioned seat switch (S3) is closed, and then the vehicle can be started. If the operator does not wear a seat belt, the seat belt switch (S1) is in a disconnected state, and the alarm sounds at the same time to remind the operator to fasten the seat belt. When the above-mentioned seat switch (S3) and the above-mentioned rear-back out-of-position sensing switch (S4) are both in a closed state, it means that the operator's operating posture and operating position are in a safe state, and the operator can normally operate the lowering valve (YV1) and the lifting valve (YV2) of the internal combustion forklift.

[0023] When the operator leaves the seat, that is, the seat switch (S3) is in the disconnected state, and the back-out-of-position sensing switch (S4) is still in the closed state, the lowering valve (YV1) and the lifting valve (YV2) of the internal combustion forklift will be disconnected after 1.5 seconds, and the operator will not be able to control the lifting of the internal combustion forklift. The operator needs to re-determine the sitting posture so that the above-mentioned seat switch (S3) and the above-mentioned back-out-of-position sensing switch (S4) are both in the closed state, so that the lowering valve (YV1) and the lifting valve (YV2) of the internal combustion forklift can be re-operated to realize the lifting function of the forklift.

[0024] If the operator sits back in the seat within 1.5 seconds, that is, the seat switch (S3) is in the closed state, the lowering valve (YV1) and the lifting valve (YV2) of the internal combustion forklift will not be disconnected, thereby ensuring that the internal combustion forklift can still be smoothly controlled on bumpy roads and ensuring its safety on bumpy roads.

[0025] When the operator leans forward, the back-out-of-position sensing switch (S4) is disconnected instantaneously. If the operator is still sitting on the seat, the seat switch (S3) is closed, and the lowering valve (YV1) and the lifting valve (YV2) of the internal combustion forklift are also closed, so the internal combustion forklift can continue to be raised or lowered.

[0026] If the operator leaves the seat, that is, the seat switch (S3) is in the disconnected state, the descending valve (YV1) and the lifting valve (YV2) will be cut off immediately, and the operator will not be able to control the lifting of the internal combustion forklift. The operator needs to confirm the sitting posture again, so that the seat switch (S3) and the back position sensor switch (S4) are both in the closed state, and then the descending valve (YV1) and the lifting valve (YV2) of the internal combustion forklift can be re-operated to realize the lifting function of the forklift. This state can only be operated temporarily, such as leaning forward to observe when the vision is poor when forking goods.

[0027] If the driving function of the internal combustion forklift is to be controlled, the specific operation method is: the operator sits on the seat, that is, the seat switch (S3) is in a closed state, after the vehicle is started, the handbrake is released, that is, the handbrake switch (S2) is disconnected, the gear is engaged, the gear switch (S5) is in a closed state, and the reversing valve (YV3) is in a working state, that is, a closed state, so that the internal combustion forklift can move forward and backward.

[0028] When the seat switch (S3) and the back-out-of-position sensing switch (S4) are both in the closed state, the operator's posture is correct and the internal combustion forklift can move forward or backward normally. When the operator leaves the seat, that is, the seat switch (S3) is in the disconnected state, and the back-out-of-position sensing switch (S4) is still in the closed state, the reversing valve (YV3) control will be disconnected after 1.5 seconds, making it impossible for the internal combustion forklift to move forward or backward. The operator's sitting posture needs to be re-determined. Even if the seat switch (S3) and the back-out-of-position sensing switch (S4) are both in the closed state and the gear is re-engaged, even if the gear switch (S5) is disconnected and then closed, the reversing valve (YV3) can be controlled to work again to realize the forward or backward movement of the internal combustion forklift. If the operator sits back in the seat within 1.5 seconds, that is, the seat switch (S3) is still in the closed state, the reversing valve (YV3) control will not be disconnected, which can ensure that the internal combustion forklift can still be smoothly controlled on bumpy roads and ensure its safety during operation.

[0029] When the back-out-of-position sensing switch (S4) is in the disconnected state (i.e. when the operator leans forward, etc.), if the operator is still in the seat, i.e. the seat switch (S3) is still in the closed state, the internal combustion forklift can continue to move forward or backward. However, once the operator leaves the seat, i.e. the seat switch (S3) is in the disconnected state or the road is bumpy, etc., the reversing valve (YV3) will be cut off immediately, and the operator's sitting posture needs to be re-determined. Even if the seat switch (S3) and the back-out-of-position sensing switch (S4) are both in the closed state, and the gear is re-engaged, even if the gear switch (S5) is disconnected and then closed, the reversing valve (YV3) can be controlled to work again to realize the forward or backward movement of the internal combustion forklift.

[0030] In order to improve the efficiency and effectiveness of the alarm system and ensure that operators can be notified quickly and effectively in emergency situations, thereby improving safety and reducing potential risks, the above-mentioned alarm in this embodiment is any one or more combinations of photoelectric alarms or sound alarms.

[0031] In order to accurately and in real time detect whether the operator is sitting on the seat, the seat switch is installed at the bottom of the seat in this embodiment. Further, in order to ensure the flexibility of the entire system and the accuracy of detection, the back-out-of-position sensing switch is installed on the back of the seat and is arranged directly opposite to the back of the operator in this embodiment.

[0032] A safety control method for operator presence perception in this embodiment can realize the presence perception of the operator and the safe control of the entire vehicle through the above steps, reducing the probability of illegal operation and accidents, thereby improving the safety of internal combustion forklifts during use.

[0033] like Figure 1 As shown, it is a schematic diagram of the safety control system of an internal combustion forklift. Since the OPS control method of an electric forklift is the same as that of an internal combustion forklift, only the power control method is different (internal combustion forklifts cut off the engine power output by controlling the gearbox reversing valve, and electric forklifts cut off the motor power by disconnecting the controller output), the back-out-of-position sensing switch and control logic of the invention are also applicable to electric forklifts.

[0034] A safety control method for operator presence perception in this embodiment is implemented based on a safety control system. A rear back departure sensing switch is added to the safety control system so that the rear back departure sensing switch and the seat switch work together. The seat switch can identify whether the operator is sitting on the seat. The rear back departure sensing switch can identify the operator's sitting posture or the distance between the operator and the rear back departure sensing switch. When the road is bumpy or the operator leaves the seat instantly, the system can avoid the phenomenon of vehicle control interruption, thereby ensuring that the forklift can operate stably and safely. The rear back departure sensing switch and the seat switch can sense the operator's presence and realize the millisecond-level cut-off response of the power and hydraulic systems once the operator leaves the seat area, thereby ensuring the safety of the operator during operation and reducing the probability of accidents. This is conducive to the promotion and application of the above-mentioned safety control method for operator presence perception in vehicles such as forklifts.

[0035] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A safety control method for operator presence perception, characterized in that: Based on the safety control system, the safety control system includes an instrument, a controller, a seat belt switch, a handbrake switch, a seat switch, a descending valve, a lifting valve and a reversing valve. The instrument is used to display the status of the seat belt switch, the handbrake switch and the seat switch; the controller is used to control the descending valve, the lifting valve and the reversing valve; the seat belt switch is used to identify whether the operator is wearing a seat belt; the handbrake switch is used to identify whether the operator has lowered the handbrake; the seat switch is used to identify whether the operator has left the seat; the safety control system also includes a back departure sensing switch, which is used to identify whether the operator's posture is correct, and the back departure sensing switch is set on the seat and the back departure sensing switch and the seat switch jointly control the vehicle's power output and lifting hydraulic system output.

2. The operator presence awareness safety control method according to claim 1, characterized in that: When the handbrake is pulled up, the handbrake switch is closed, and the operator sits on the seat, the seat switch is closed, and the forklift can be started.

3. The operator presence perception safety control method according to claim 2, characterized in that: An alarm is integrated in the instrument to remind the operator that he / she is not wearing a seat belt; if the operator is not wearing a seat belt, the seat belt switch is in a disconnected state and the alarm sounds.

4. The operator presence awareness safety control method according to claim 3, characterized in that: The alarm is any one or more combinations of photoelectric alarm or sound alarm.

5. The operator presence awareness safety control method according to claim 3, characterized in that: When the seat switch and the back-out-of-position sensing switch are both closed, the operator can control the forklift to rise and fall normally; when the operator leaves the seat, the seat switch is disconnected, and the back-out-of-position sensing switch is still in the closed state, the lifting valve is disconnected after 1.5 seconds, and the lifting cannot be controlled; If the lifting function of the forklift needs to be re-controlled, the operator needs to re-determine the sitting posture so that the seat switch and the back-out-of-position sensing switch are both in a closed state.

6. The operator presence awareness safety control method according to claim 5, characterized in that: If the operator sits back in the seat within 1.5 seconds and the seat switch is in a closed state, the lifting valve control will not be disconnected, thereby ensuring smooth control on bumpy roads.

7. The operator presence awareness safety control method according to claim 6, characterized in that: If the operator leans forward and the back-out-of-position sensing switch is disconnected, and the operator is still on the seat and the seat switch is in a closed state, the forklift can continue to be operated to rise and fall.

8. The operator presence awareness safety control method according to claim 7, characterized in that: If the operator leaves the seat, the seat switch and the back-off-position sensing switch are both in a disconnected state, and the forklift cannot be controlled to rise or fall, and the operator's sitting posture needs to be re-determined.

9. The operator presence awareness safety control method according to claim 8, characterized in that: The seat switch is installed on the bottom of the seat.

10. The operator presence awareness safety control method according to claim 9, characterized in that: The back-off position sensing switch is installed on the back of the seat and is arranged directly opposite to the back of the operator.

Images