Power failure alarm control system for anti-explosion diesel fork lift truck

Abstract

The invention discloses a power-off alarm control system for an anti-explosion diesel fork lift truck, relates to the technical field of fork lift truck switches, and aims to solve the problem that a traditional anti-explosion fork lift truck lacks automatic alarm and control on a power-off switch after parking and flameout. One end of the whole vehicle electric loop is connected with a contactor-contact switch Q, and the power-off loop comprises a contactor-coil Q corresponding to the contactor-contact switch Q; the whole vehicle electric loop comprises an alarm power-off loop and a controller KZ, the controller KZ can control the power-off loop and the alarm power-off loop to be opened and closed, and the controller KZ is connected with an electronic control unit (ECU). According to the power failure alarm control system for the anti-explosion diesel fork lift truck, forced protection of a power source is achieved, and then the safety of the fork lift truck can be guaranteed.

Description

Technical Field

[0001] This invention relates to the field of forklift switch technology, specifically to a power failure alarm control system for explosion-proof internal combustion forklifts. Background Technology

[0002] In traditional explosion-proof forklifts, power on / off control typically relies on the driver manually operating a mechanical plunger-type main power switch. Existing auxiliary control measures mainly include professional training sessions on forklift operation and the placement of permanent power-off warning signs near the instrument panel power switch, emphasizing the operating procedure that the main power switch must be turned off immediately after the forklift is stopped and the engine is turned off. However, manual training and signage cannot guarantee that the driver will actually turn off the power switch after stopping and turning off the engine, leaving the vehicle in a powered state and causing power depletion issues.

[0003] Chinese patent with publication number CN117774710A relates to a control method for an electric forklift. This patent can meet the needs of different travel speeds of the electric forklift, but it still cannot solve the problem that traditional explosion-proof forklifts need to manually turn off the power switch after stopping and turning off the engine. Summary of the Invention

[0004] This invention solves the problem that traditional explosion-proof forklifts lack automatic alarm and control for power-off switches after parking and engine shutdown. It proposes a power-off alarm control system for explosion-proof internal combustion forklifts, which realizes forced protection of the power supply and thus ensures the safety of the forklift.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a power failure alarm control system for explosion-proof internal combustion forklifts, comprising a vehicle power supply circuit and a power failure circuit, one end of the vehicle power supply circuit being connected to a contactor-contact switch Q, and the power failure circuit including a contactor-coil Q corresponding to the contactor-contact switch Q; the vehicle power supply circuit including an alarm power failure circuit and a controller KZ, the controller KZ being able to control the opening and closing of the power failure circuit and the alarm power failure circuit, and the controller KZ being connected to an electronic control unit (ECU).

[0006] The technical solution of this invention enables control via the circuit logic within the explosion-proof enclosure as long as the explosion-proof forklift is powered on but not started. If the driver stops the forklift but does not turn off the power switch, the alarm system will alert the driver to turn off the power switch. If the driver still does not turn off the power switch, the controller KZ will automatically turn off the power switch within a set time after the forklift is stopped. This avoids the forklift being in a continuously energized state when parked, reduces power loss from the explosion-proof power supply, ensures the forklift is in a consistently healthy electrical state, and improves production efficiency and vehicle safety.

[0007] The present invention is further configured such that: the input terminal of the contactor-coil Q in the power-off circuit is connected to a second fuse F2, one end of the second fuse F2 is connected to the positive terminal of the explosion-proof power supply Bat, the output terminal of the contactor-coil Q is connected to a power-off switch S1, the output terminal of the power-off switch S1 is connected to a power-off relay-contact switch K2, the output terminal of the power-off relay-contact switch K2 is connected to the negative terminal of the explosion-proof power supply Bat, and the power-off relay-contact switch K2 is connected to a controller KZ.

[0008] In this technical solution, the power-off relay coil K2 is connected to the controller KZ. When the controller KZ sends a high-level signal, the power-off relay coil K2 is energized and closes. At this time, the power-off relay contact switch K2 changes from normally closed to open, thereby making the power-off circuit open.

[0009] The present invention is further configured such that: the alarm power-off circuit includes a third fuse F3, the input terminal of the third fuse F3 is connected to a first fuse F1, the input terminal of the first fuse F1 is connected to a contactor-contact switch Q; the output terminal of the third fuse F3 is connected to an alarm relay-contact switch K1, the output terminal of the alarm relay-contact switch K1 is connected to an explosion-proof alarm BJ, and the output terminal of the explosion-proof alarm BJ is connected to the negative terminal of the explosion-proof power supply Bat.

[0010] In this technical solution, the function of the alarm power-off circuit is to control whether the explosion-proof alarm BJ is working through the alarm relay-contact switch K1.

[0011] The present invention is further configured such that: the vehicle power circuit also includes a key switch S2, the key switch S2 is connected to the electronic control ECU and the controller KZ respectively, one end of the electronic control ECU is connected to the negative terminal of the explosion-proof power supply Bat, the controller KZ is connected to a power-off relay-coil K2 and an alarm relay-coil K1 respectively, and the other end of the power-off relay-coil K2 and the other end of the alarm relay-coil K1 are both connected to the negative terminal of the explosion-proof power supply Bat.

[0012] In this technical solution, the controller KZ controls whether the power-off relay-coil K2 and the alarm relay-coil K1 are engaged, thereby controlling the power-off circuit and the alarm power-off circuit.

[0013] The present invention is further configured such that: one end of the electronic control ECU is connected to a fourth fuse F4, the controller KZ is connected to a fifth fuse F5, and the input terminals of the fourth fuse F4 and the fifth fuse F5 are both connected to a first fuse F1.

[0014] The present invention is further configured such that: the vehicle power circuit also includes an explosion-proof motor G, the input terminal of the explosion-proof motor G is connected to the first fuse F1, the E terminal of the explosion-proof motor G is connected to the negative terminal of the explosion-proof power supply Bat, and the D+ terminal of the explosion-proof motor G is connected to the input terminals of the controller KZ and the charging indicator L.

[0015] In this technical solution, the explosion-proof motor G provides power output for the vehicle's power consumption and the charging of the explosion-proof power supply Bat after the vehicle is in operation; and the D+ terminal of the explosion-proof motor G will output working current and voltage, which the controller KZ uses to determine the power generation status of the explosion-proof motor G and the explosion-proof instrument determines whether the explosion-proof motor G is in a normal power generation state.

[0016] The present invention is further configured such that the output terminal of the charging indicator light L is connected to the negative terminal of the explosion-proof power supply Bat.

[0017] The present invention is further configured such that: the electronic control ECU is also connected to a Zener safety barrier N, and the Zener safety barrier N is connected to a crankshaft speed sensor J.

[0018] In this technical solution, the Zener safety barrier N can control the output voltage and output current and limit the output current to ensure that the energy output to the danger zone is within a safe range.

[0019] The present invention is further configured such that the input terminal of the contactor-contact switch Q is connected to the positive terminal of the explosion-proof power supply Bat.

[0020] The present invention is further configured such that the output terminal of the key switch S2 is connected to the ACC terminal of the electronic control ECU and the ACC terminal of the controller KC.

[0021] In this technical solution, after the key switch is closed, an ACC power signal can be provided to the electronic control ECU and the controller KZ.

[0022] The present invention provides a power failure alarm control system for explosion-proof internal combustion forklifts, which can bring the following beneficial effects: 1. By setting up the vehicle's power supply circuit, power-off circuit, and alarm power-off circuit, forced protection of the power supply can be achieved, thereby ensuring the safety of the forklift. 2. Automatic control of power failure circuits and alarm power failure circuits is achieved through controller KZ, without the need for manual operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a power failure alarm control system for an explosion-proof internal combustion forklift according to the present invention.

[0024] Figure 2 This is a control flowchart of a power failure alarm control system for an explosion-proof internal combustion forklift according to the present invention. Detailed Implementation

[0025] Example 1 To address the lack of automatic alarm and control for power-off switches in traditional explosion-proof forklifts after the engine is turned off, this embodiment proposes a power-off alarm and control system for explosion-proof internal combustion forklifts, referencing... Figure 1 and Figure 2 It mainly includes a vehicle power circuit and a power-off circuit. One end of the vehicle power circuit is connected to a contactor-contact switch Q. The power-off circuit includes a contactor-coil Q, which corresponds to the contactor-contact switch Q. The vehicle power circuit includes an alarm power-off circuit and a controller KZ. The controller KZ can control the opening and closing of the power-off circuit and the alarm power-off circuit. The controller KZ is connected to the electronic control unit (ECU).

[0026] refer to Figure 1 In the power-off circuit, the input terminal of the contactor-coil Q is connected to the second fuse F2, one end of the second fuse F2 is connected to the positive terminal of the explosion-proof power supply Bat, the output terminal of the contactor-coil Q is connected to the input terminal of the power-off switch S1, the output terminal of the power-off switch S1 is connected to the input terminal of the power-off relay-contact switch K2, the output terminal of the power-off relay-contact switch K2 is connected to the output terminal of the negative terminal of the explosion-proof power supply Bat, and the power-off relay-contact switch K2 is connected to the controller KZ.

[0027] In this embodiment, the power-off relay coil K2 is connected to the controller KZ. When the controller KZ sends a high-level signal, the power-off relay coil K2 is energized and closes. At this time, the power-off relay contact switch K2 changes from normally closed to open, thereby making the power-off circuit open.

[0028] Continue to refer to Figure 1 The alarm power-off circuit mainly includes a third fuse F3. The input terminal of the third fuse F3 is connected to the first fuse F1, and the input terminal of the first fuse F1 is connected to the contactor-contact switch Q. The output terminal of the third fuse F3 is connected to the alarm relay-contact switch K1, the output terminal of the alarm relay-contact switch K1 is connected to the explosion-proof alarm BJ, and the output terminal of the explosion-proof alarm BJ is connected to the negative terminal of the explosion-proof power supply Bat.

[0029] In this embodiment, the function of the alarm power-off circuit is to control whether the explosion-proof alarm BJ is working through the alarm relay-contact switch K1.

[0030] The vehicle's electrical circuit also includes a key switch S2. One end of the key switch S2 is connected to the electronic control ECU and the controller KZ, and the other end of the key switch S2 is connected to the first fuse. One end of the electronic control ECU is connected to the negative terminal of the explosion-proof power supply Bat. The controller KZ is connected to the power-off relay coil K2 and the alarm relay coil K1. The other ends of the power-off relay coil K2 and the alarm relay coil K1 are both connected to the negative terminal of the explosion-proof power supply Bat.

[0031] Specifically, terminal Z1 of controller KZ is connected to alarm relay coil K1, and terminal Z2 of controller KZ is connected to power-off relay coil K2. In this embodiment, the controller KZ controls whether the power-off relay-coil K2 and the alarm relay-coil K1 are engaged, thereby controlling the power-off circuit and the alarm power-off circuit.

[0032] One end of the electronic control unit (ECU) is also connected to the fourth fuse F4, and the controller KZ is also connected to the fifth fuse F5. The input terminals of both the fourth fuse F4 and the fifth fuse F5 are connected to the first fuse F1. The fourth fuse F4 protects the ECU, while the fifth fuse F5 protects the controller KZ and its control output load components.

[0033] In addition, the vehicle's electrical circuit also includes an explosion-proof motor G. The input terminal of the explosion-proof motor G is connected to the first fuse F1. The E terminal of the explosion-proof motor G is directly connected to the negative terminal of the explosion-proof power supply Bat. The D+ terminal of the explosion-proof motor G is connected to the input terminals of the controller KZ and the charging indicator L, respectively. The output terminal of the charging indicator L is connected to the negative terminal of the explosion-proof power supply Bat.

[0034] In this embodiment, the explosion-proof motor G provides power output for the vehicle's power consumption and the charging of the explosion-proof power supply Bat after the vehicle is running; and the D+ terminal of the explosion-proof motor G will output working current and voltage, which the controller KZ uses to determine the power generation status of the explosion-proof motor G and the explosion-proof instrument determines whether the explosion-proof motor G is in a normal power generation state.

[0035] The electronic control unit (ECU) is also connected to the Zener barrier N, which in turn is connected to the crankshaft speed sensor J.

[0036] In this embodiment, the Zener safety barrier N can control the output voltage, output current and limit the output current to ensure that the energy output to the danger zone is within a safe range.

[0037] The input terminal of the contactor-contact switch Q is connected to the positive terminal of the explosion-proof power supply Bat.

[0038] The output of the key switch S2 is specifically connected to the ACC terminal of the electronic control ECU and the ACC terminal of the controller KC.

[0039] In this embodiment, after the key switch is closed, an ACC power signal can be provided to the electronic control ECU and the controller KZ.

[0040] The following describes the various components of a power failure alarm control system for an explosion-proof internal combustion forklift according to this embodiment.

[0041] For the explosion-proof power supply (BAT), it serves as the power source for the entire vehicle, providing initial power for the vehicle's startup and operation.

[0042] In this embodiment, one end of the contactor-coil Q is connected to the B+ terminal of the explosion-proof power supply Bat via the second fuse F2, and the other end is connected to the input terminal of the power-off switch S1. The output terminal of the power-off switch S1 is connected to the input terminal of the power-off relay-contact switch K2, and the output terminal of the power-off relay-contact switch K2 is connected to the B- terminal of the explosion-proof power supply Bat. In this circuit, the power-off switch S1 can cut off the vehicle's power supply, preventing the vehicle from being in a powered-on state for extended periods. The power-off relay-coil K2 is connected to the controller KZ. When a high-level signal is received from the controller KZ, the power-off relay-coil K2 is energized and engages; at this time, the power-off relay-contact switch K2 changes from normally closed to open, thus making one end of the circuit of the contactor-coil Q open. This embodiment also includes a cutoff diode D, which is connected in reverse across the two ends of the contactor-coil Q to prevent reverse current from flowing back.

[0043] One end of the contactor-contact switch Q is connected to the B+ of the explosion-proof power supply Bat, and the other end is connected to the vehicle power fuse F1. It serves as the connection point between the explosion-proof power supply Bat and the vehicle power supply, and its function is to control the on / off of the vehicle power supply.

[0044] In this embodiment, the output terminal of the vehicle electrical fuse F1 can be divided into 6 circuits, which are respectively connected to the input terminal of fuse F3, the B+ input terminal of key switch S2, the input terminal of fuse F4, the input terminal of fuse F5, and the B+ input terminal of the anti-explosion motor G. Figure 1 F1 serves as the fuse for the vehicle's operating circuit, protecting the circuit from damage in the event of a short circuit. Additionally, F2 protects the contactor-coil Q circuit; F3 protects the alarm power-off circuit; F4 protects the electronic control unit (ECU), safeguarding the ECU and its controlled sensors and load components; and F5 protects the controller KZ, safeguarding the controller KZ and its controlled output load components.

[0045] One end of the alarm relay-contact switch 87a K1 is connected to the output terminal of fuse F3-5A, and the other end is connected to the input terminal of explosion-proof alarm BJ. The output terminal of explosion-proof alarm BJ is connected to the B- terminal of explosion-proof power supply Bat. The function of this circuit is to control whether explosion-proof alarm BJ is activated through alarm relay-contact switch 87a K1.

[0046] The output of key switch S2 is connected to both the ACC terminal of the electronic control ECU and the ACC terminal of the controller KZ. The controller KZ can control the vehicle's movement, attachment movements, and other alarm actions. Through interaction with the electronic control ECU, the controller KZ issues corresponding alarm commands after the vehicle is stopped. When key switch S2 in this circuit is closed, it provides ACC power signals to the electronic control ECU and the controller KZ.

[0047] More specifically, the crankshaft speed sensor J is connected to the hazardous area of ​​the Zener safety barrier N, and the safe area of ​​the Zener safety barrier N is connected to the electronic control ECU. After the engine starts, the crankshaft speed sensor J collects the real-time engine speed and converts it into an electrical signal, which is transmitted to the electronic control ECU through the Zener safety barrier N. The Zener safety barrier N can control the output voltage, the maximum output current, and limit the output current to ensure that the energy output to the hazardous area is within a safe range.

[0048] The output of fuse F4 is connected to the B+ terminal of the electronic control unit (ECU), and its function is to provide power to the ECU. The output of fuse F5 is connected to the B+ terminal of controller KZ. The Z2 terminal of controller KZ is connected to the input terminal of power-off relay coil K2. The output terminal of power-off relay coil K2 is connected to the B- terminal of explosion-proof power supply Bat. The Z1 terminal of controller KZ is connected to the input terminal of power-off relay coil K1. The output terminal of power-off relay coil K1 is connected to the B- terminal of explosion-proof power supply Bat. The ECU and controller KZ are connected via a CAN communication bus. The electronic control unit (ECU) is integrated into the engine and can precisely control the engine's start-stop and power output. Simultaneously, it connects to the vehicle's controller KZ via a CAN bus, enabling bus information communication. It can transmit start signal commands, engine speed, and other vehicle operating information, and receive external input signals to comprehensively determine whether to control the activation of the power-off relay coil K2 and the alarm relay coil K1. The alarm relay coil K1 is controlled by the controller KZ. When the vehicle is parked and the engine is turned off, the anti-ignition motor G stops working. The controller KZ determines the stop output based on the operating current and voltage at the D+ terminal of the anti-ignition motor G. The alarm relay coil K1 generates a high-level alarm signal. When the alarm relay coil K1 is not activated, the alarm relay contact switch K1 is in a normally closed circuit state. At this time, the explosion-proof alarm BJ is energized and emits an alarm sound. When the vehicle is running and the explosion-proof motor G is in normal working condition, the controller KZ determines the operating current and voltage of the explosion-proof motor G's D+ terminal and outputs a high-level alarm signal to the alarm relay coil K1. The alarm relay coil K1 is energized and activated, and the alarm relay contact switch K1 is in a normally open circuit state. At this time, the explosion-proof alarm BJ will not emit an alarm sound.

[0049] The B+ input terminal of the explosion-proof motor G is connected to the vehicle's electrical fuse F1. The E terminal of the explosion-proof motor G is connected to the B- terminal of the explosion-proof power supply Bat. The D+ terminal of the explosion-proof motor G is connected to the Z3 terminal of the controller KZ and the input terminal of the charging indicator L. The output terminal of the charging indicator L is connected to the B- terminal of the explosion-proof power supply Bat. The explosion-proof motor G provides power output for the vehicle's electrical needs and the charging of the explosion-proof power supply Bat after the vehicle is running. Its D+ terminal outputs operating current and voltage, which can be sent to the controller KZ. The controller KZ determines the power generation status of the explosion-proof motor G, and the explosion-proof instruments determine whether the explosion-proof motor G is in a normal power generation state.

[0050] This invention determines whether a forklift is in operation by monitoring engine speed, and uses this information to determine when to cut off the power. The controller of this invention can output an alarm signal to proactively remind the driver to turn off the power switch; after a set event, if the controller still detects that the forklift has not turned off the power switch, it will then issue a power-off signal to forcibly cut off the power.

[0051] Example 2 This embodiment proposes a power failure alarm control system for explosion-proof internal combustion forklifts, referencing... Figure 1 It includes a vehicle power circuit and a power-off circuit. One end of the vehicle power circuit is connected to a contactor-contact switch Q. The power-off circuit includes a contactor-coil Q, which corresponds to the contactor-contact switch Q. The vehicle power circuit includes an alarm power-off circuit and a controller KZ. The controller KZ can control the opening and closing of the power-off circuit and the alarm power-off circuit. The controller KZ is connected to the electronic control unit (ECU).

[0052] refer to Figure 1 In the power-off circuit, the input terminal of the contactor-coil Q is connected to the second fuse F2, one end of the second fuse F2 is connected to the positive terminal of the explosion-proof power supply Bat, the output terminal of the contactor-coil Q is connected to the input terminal of the power-off switch S1, the output terminal of the power-off switch S1 is connected to the input terminal of the power-off relay-contact switch K2, the output terminal of the power-off relay-contact switch K2 is connected to the output terminal of the negative terminal of the explosion-proof power supply Bat, and the power-off relay-contact switch K2 is connected to the controller KZ.

[0053] In this embodiment, the power-off relay coil K2 is connected to the controller KZ. When the controller KZ sends a high-level signal, the power-off relay coil K2 is energized and closes. At this time, the power-off relay contact switch K2 changes from normally closed to open, thereby making the power-off circuit open.

[0054] Continue to refer to Figure 1 The alarm power-off circuit mainly includes a third fuse F3. The input terminal of the third fuse F3 is connected to the first fuse F1, and the input terminal of the first fuse F1 is connected to the contactor-contact switch Q. The output terminal of the third fuse F3 is connected to the alarm relay-contact switch K1, the output terminal of the alarm relay-contact switch K1 is connected to the explosion-proof alarm BJ, and the output terminal of the explosion-proof alarm BJ is connected to the negative terminal of the explosion-proof power supply Bat.

[0055] In this embodiment, the function of the alarm power-off circuit is to control whether the explosion-proof alarm BJ is working through the alarm relay-contact switch K1.

[0056] The vehicle's electrical circuit also includes a key switch S2. One end of the key switch S2 is connected to the electronic control ECU and the controller KZ, and the other end of the key switch S2 is connected to the first fuse. One end of the electronic control ECU is connected to the negative terminal of the explosion-proof power supply Bat. The controller KZ is connected to the power-off relay coil K2 and the alarm relay coil K1. The other ends of the power-off relay coil K2 and the alarm relay coil K1 are both connected to the negative terminal of the explosion-proof power supply Bat.

[0057] Specifically, terminal Z1 of controller KZ is connected to alarm relay coil K1, and terminal Z2 of controller KZ is connected to power-off relay coil K2. In this embodiment, the controller KZ controls whether the power-off relay-coil K2 and the alarm relay-coil K1 are engaged, thereby controlling the power-off circuit and the alarm power-off circuit.

[0058] One end of the electronic control unit (ECU) is also connected to the fourth fuse F4, and the controller KZ is also connected to the fifth fuse F5. The input terminals of both the fourth fuse F4 and the fifth fuse F5 are connected to the first fuse F1. The fourth fuse F4 protects the ECU, while the fifth fuse F5 protects the controller KZ and its control output load components.

[0059] In addition, the vehicle's electrical circuit also includes an explosion-proof motor G. The input terminal of the explosion-proof motor G is connected to the first fuse F1. The E terminal of the explosion-proof motor G is directly connected to the negative terminal of the explosion-proof power supply Bat. The D+ terminal of the explosion-proof motor G is connected to the input terminals of the controller KZ and the charging indicator L, respectively. The output terminal of the charging indicator L is connected to the negative terminal of the explosion-proof power supply Bat.

[0060] In this embodiment, the explosion-proof motor G provides power output for the vehicle's power consumption and the charging of the explosion-proof power supply Bat after the vehicle is running; and the D+ terminal of the explosion-proof motor G will output working current and voltage, which the controller KZ uses to determine the power generation status of the explosion-proof motor G and the explosion-proof instrument determines whether the explosion-proof motor G is in a normal power generation state.

[0061] The electronic control unit (ECU) is also connected to the Zener barrier N, which in turn is connected to the crankshaft speed sensor J.

[0062] In this embodiment, the Zener safety barrier N can control the output voltage, output current and limit the output current to ensure that the energy output to the danger zone is within a safe range.

[0063] The input terminal of the contactor-contact switch Q is connected to the positive terminal of the explosion-proof power supply Bat.

[0064] The output of the key switch S2 is specifically connected to the ACC terminal of the electronic control ECU and the ACC terminal of the controller KC.

[0065] In this embodiment, after the key switch is closed, an ACC power signal can be provided to the electronic control ECU and the controller KZ.

[0066] The following describes the various components of a power failure alarm control system for an explosion-proof internal combustion forklift according to this embodiment.

[0067] For the explosion-proof power supply (BAT), it serves as the power source for the entire vehicle, providing initial power for the vehicle's startup and operation.

[0068] In this embodiment, one end of the contactor-coil Q is connected to the B+ terminal of the explosion-proof power supply Bat via the second fuse F2, and the other end is connected to the input terminal of the power-off switch S1. The output terminal of the power-off switch S1 is connected to the input terminal of the power-off relay-contact switch K2, and the output terminal of the power-off relay-contact switch K2 is connected to the B- terminal of the explosion-proof power supply Bat. In this circuit, the power-off switch S1 can cut off the vehicle's power supply, preventing the vehicle from being in a powered-on state for extended periods. The power-off relay-coil K2 is connected to the controller KZ. When a high-level signal is received from the controller KZ, the power-off relay-coil K2 is energized and engages; at this time, the power-off relay-contact switch K2 changes from normally closed to open, thus making one end of the circuit of the contactor-coil Q open. This embodiment also includes a cutoff diode D, which is connected in reverse across the two ends of the contactor-coil Q to prevent reverse current from flowing back.

[0069] One end of the contactor-contact switch Q is connected to the B+ of the explosion-proof power supply Bat, and the other end is connected to the vehicle power fuse F1. It serves as the connection point between the explosion-proof power supply Bat and the vehicle power supply, and its function is to control the on / off of the vehicle power supply.

[0070] In this embodiment, the output terminal of the vehicle electrical fuse F1 can be divided into 6 circuits, which are respectively connected to the input terminal of fuse F3, the B+ input terminal of key switch S2, the input terminal of fuse F4, the input terminal of fuse F5, and the B+ input terminal of the anti-explosion motor G. Figure 1 F1 serves as the fuse for the vehicle's operating circuit, protecting the circuit from damage in the event of a short circuit. Additionally, F2 protects the contactor-coil Q circuit; F3 protects the alarm power-off circuit; F4 protects the electronic control unit (ECU), safeguarding the ECU and its controlled sensors and load components; and F5 protects the controller KZ, safeguarding the controller KZ and its controlled output load components.

[0071] One end of the alarm relay-contact switch 87a K1 is connected to the output terminal of fuse F3-5A, and the other end is connected to the input terminal of explosion-proof alarm BJ. The output terminal of explosion-proof alarm BJ is connected to the B- terminal of explosion-proof power supply Bat. The function of this circuit is to control whether explosion-proof alarm BJ is activated through alarm relay-contact switch 87a K1.

[0072] The output of key switch S2 is connected to both the ACC terminal of the electronic control ECU and the ACC terminal of the controller KZ. The controller KZ can control the vehicle's movement, attachment movements, and other alarm actions. Through interaction with the electronic control ECU, the controller KZ issues corresponding alarm commands after the vehicle is stopped. When key switch S2 in this circuit is closed, it provides ACC power signals to the electronic control ECU and the controller KZ.

[0073] More specifically, the crankshaft speed sensor J is connected to the hazardous area of ​​the Zener safety barrier N, and the safe area of ​​the Zener safety barrier N is connected to the electronic control ECU. After the engine starts, the crankshaft speed sensor J collects the real-time engine speed and converts it into an electrical signal, which is transmitted to the electronic control ECU through the Zener safety barrier N. The Zener safety barrier N can control the output voltage, the maximum output current, and limit the output current to ensure that the energy output to the hazardous area is within a safe range.

[0074] The output of fuse F4 is connected to the B+ terminal of the electronic control unit (ECU), and its function is to provide power to the ECU. The output of fuse F5 is connected to the B+ terminal of controller KZ. The Z2 terminal of controller KZ is connected to the input terminal of power-off relay coil K2. The output terminal of power-off relay coil K2 is connected to the B- terminal of explosion-proof power supply Bat. The Z1 terminal of controller KZ is connected to the input terminal of power-off relay coil K1. The output terminal of power-off relay coil K1 is connected to the B- terminal of explosion-proof power supply Bat. The ECU and controller KZ are connected via a CAN communication bus. The electronic control unit (ECU) is integrated into the engine and can precisely control the engine's start-stop and power output. Simultaneously, it connects to the vehicle's controller KZ via a CAN bus, enabling bus information communication. It can transmit start signal commands, engine speed, and other vehicle operating information, and receive external input signals to comprehensively determine whether to control the activation of the power-off relay coil K2 and the alarm relay coil K1. The alarm relay coil K1 is controlled by the controller KZ. When the vehicle is parked and the engine is turned off, the anti-ignition motor G stops working. The controller KZ determines the stop output based on the operating current and voltage at the D+ terminal of the anti-ignition motor G. The alarm relay coil K1 generates a high-level alarm signal. When the alarm relay coil K1 is not activated, the alarm relay contact switch K1 is in a normally closed circuit state. At this time, the explosion-proof alarm BJ is energized and emits an alarm sound. When the vehicle is running and the explosion-proof motor G is in normal working condition, the controller KZ determines the operating current and voltage of the explosion-proof motor G's D+ terminal and outputs a high-level alarm signal to the alarm relay coil K1. The alarm relay coil K1 is energized and activated, and the alarm relay contact switch K1 is in a normally open circuit state. At this time, the explosion-proof alarm BJ will not emit an alarm sound.

[0075] The B+ input terminal of the explosion-proof motor G is connected to the vehicle's electrical fuse F1. The E terminal of the explosion-proof motor G is connected to the B- terminal of the explosion-proof power supply Bat. The D+ terminal of the explosion-proof motor G is connected to the Z3 terminal of the controller KZ and the input terminal of the charging indicator L. The output terminal of the charging indicator L is connected to the B- terminal of the explosion-proof power supply Bat. The explosion-proof motor G provides power output for the vehicle's electrical needs and the charging of the explosion-proof power supply Bat after the vehicle is running. Its D+ terminal outputs operating current and voltage, which can be sent to the controller KZ. The controller KZ determines the power generation status of the explosion-proof motor G, and the explosion-proof instruments determine whether the explosion-proof motor G is in a normal power generation state.

[0076] Based on the above, this embodiment also proposes a power failure alarm control method for explosion-proof internal combustion forklifts, referencing... Figure 2 The main process includes the following steps: First, determine whether the power-off switch is closed. If it is closed, the controller will not output control signals to the power-off circuit and the power-off alarm circuit. If it is open, the state of the key switch S2 needs to be determined.

[0077] If the key switch S2 is turned off, the controller will activate the power failure alarm circuit within 5 seconds. The explosion-proof alarm will issue a warning message "Please turn off the power failure switch" to remind the operator. At the same time, the controller's internal timer will start counting. If no one operates the power failure switch within the set time, the controller will activate the power failure circuit to cut off the power supply to the entire vehicle.

[0078] If the key switch is closed, the system needs to comprehensively determine whether the vehicle is in working condition by combining the generator neutral point signal and the crankshaft speed transmission signal. If the controller does not receive a working condition signal, it will control the power failure alarm circuit within 1 minute, and the explosion-proof alarm will issue a warning message "Please turn off the power failure switch" to remind the operator. At the same time, the controller's internal timer will start counting. When the explosion-proof alarm BJ alarms continuously for more than the set time (e.g., 5 minutes), the controller KZ will issue a high-level power failure signal to cut off the vehicle's power supply. If the controller receives a signal that the vehicle is in working condition, it will not control the power failure circuit or the power failure alarm circuit.

[0079] This invention monitors engine speed to determine whether the forklift is running, thus determining the time to cut off power. The controller outputs an alarm signal to proactively remind operators to manually turn off the power switch, cultivating good operating habits. If the controller detects that the power switch is not turned off after a set time, it will issue a power-off signal to forcibly cut off power. Furthermore, all components of this invention are designed and operate under explosion-proof requirements. This invention, while ensuring high accuracy, rapid response, and clear logic, guarantees a safe operating environment for forklift startup; it solves the safety hazards caused by improper operation by personnel and cultivates good operating habits in daily use.

Claims

1. A power failure alarm control system for explosion-proof internal combustion forklifts, characterized in that, It includes a vehicle power supply circuit and a power-off circuit. One end of the vehicle power supply circuit is connected to a contactor-contact switch Q. The power-off circuit includes a contactor-coil Q corresponding to the contactor-contact switch Q. The vehicle power supply circuit includes an alarm power-off circuit and a controller KZ. The controller KZ can control the opening and closing of the power-off circuit and the alarm power-off circuit. The controller KZ is connected to an electronic control unit (ECU).

2. The power failure alarm control system for explosion-proof internal combustion forklifts according to claim 1, characterized in that, In the power-off circuit, the input terminal of the contactor-coil Q is connected to a second fuse F2, one end of which is connected to the positive terminal of the explosion-proof power supply Bat. The output terminal of the contactor-coil Q is connected to a power-off switch S1, the output terminal of the power-off switch S1 is connected to a power-off relay-contact switch K2, the output terminal of the power-off relay-contact switch K2 is connected to the negative terminal of the explosion-proof power supply Bat, and the power-off relay-contact switch K2 is connected to a controller KZ.

3. A power failure alarm control system for explosion-proof internal combustion forklifts according to claim 1 or 2, characterized in that, The alarm power-off circuit includes a third fuse F3, the input of which is connected to a first fuse F1, and the input of the first fuse F1 is connected to a contactor-contact switch Q; the output of the third fuse F3 is connected to an alarm relay-contact switch K1, the output of the alarm relay-contact switch K1 is connected to an explosion-proof alarm BJ, and the output of the explosion-proof alarm BJ is connected to the negative terminal of the explosion-proof power supply Bat.

4. A power failure alarm control system for explosion-proof internal combustion forklifts according to claim 1 or 2, characterized in that, The vehicle electrical circuit also includes a key switch S2, which is connected to the electronic control unit (ECU) and the controller KZ. One end of the ECU is connected to the negative terminal of the explosion-proof power supply Bat. The controller KZ is connected to a power-off relay coil K2 and an alarm relay coil K1. The other ends of the power-off relay coil K2 and the alarm relay coil K1 are both connected to the negative terminal of the explosion-proof power supply Bat.

5. A power failure alarm control system for explosion-proof internal combustion forklifts according to claim 4, characterized in that, One end of the electronic control ECU is also connected to a fourth fuse F4, and the controller KZ is also connected to a fifth fuse F5. The input terminals of the fourth fuse F4 and the fifth fuse F5 are both connected to the first fuse F1.

6. A power failure alarm control system for explosion-proof internal combustion forklifts according to claim 1 or 5, characterized in that, The vehicle electrical circuit also includes an explosion-proof motor G. The input terminal of the explosion-proof motor G is connected to the first fuse F1, the E terminal of the explosion-proof motor G is connected to the negative terminal of the explosion-proof power supply Bat, and the D+ terminal of the explosion-proof motor G is connected to the input terminals of the controller KZ and the charging indicator L.

7. A power failure alarm control system for explosion-proof internal combustion forklifts according to claim 6, characterized in that, The output terminal of the charging indicator light L is connected to the negative terminal of the explosion-proof power supply Bat.

8. A power failure alarm control system for explosion-proof internal combustion forklifts according to claim 1 or 5, characterized in that, The electronic control unit (ECU) is also connected to a Zener safety barrier N, which is connected to a crankshaft speed sensor J.

9. A power failure alarm control system for explosion-proof internal combustion forklifts according to claim 3, characterized in that, The input terminal of the contactor-contact switch Q is connected to the positive terminal of the explosion-proof power supply Bat.

10. A power failure alarm control system for an explosion-proof internal combustion forklift according to claim 4, characterized in that, The output terminal of the key switch S2 is connected to the ACC terminal of the electronic control ECU and the ACC terminal of the controller KC.

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