Loader maintenance mode control circuit

Abstract

The utility model relates to a maintenance mode control circuit for a loader. The maintenance mode control circuit comprises a power supply, a fault maintenance switch, a key starting switch, a normally closed relay, a first normally open relay, a second normally open relay, an engine controller, an alarm lamp and an instrument display. The state of a related relay is controlled through a fault overhaul switch and a key starting switch, when a maintainer conducts overhaul, other operators cannot start the vehicle, and other operators are reminded that the vehicle is in the overhaul state through flickering of an alarm lamp, reminding information displayed by an instrument and buzzing. And the damage to the maintainer caused by starting the vehicle by other personnel in the maintenance process is avoided.

Description

Technical Field

[0001] The utility model relates to a control circuit, in particular to a maintenance mode control circuit of a loader. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] During the operation of the loader, due to the complex working environment and working conditions, it is easy to malfunction. At this time, maintenance personnel are required to inspect the loader. Due to the large size of the loader, there are a lot of blind spots. When the maintenance personnel are inspecting the loader, other personnel may not be able to recognize that the vehicle is currently under maintenance. If they get on the vehicle to operate at this time, it is very easy to be dangerous. Utility Model Content

[0004] The utility model aims to provide a maintenance mode control circuit for a loader, comprising a power supply, a fault repair switch, a key start switch, a normally closed relay, a first normally open relay, a second normally open relay, an engine controller, a warning light and an instrument display;

[0005] The fault repair switch is connected to the first normally open relay and the normally closed relay respectively, the first normally open relay and the normally closed relay are connected in parallel; the second normally open relay and the normally closed relay are connected in series;

[0006] The first normally open relay is also connected to the warning light and the power supply; the normally closed relay is also connected to the power supply and the engine controller;

[0007] The second normally open relay is connected to a power source, a key start switch and an instrument display, and is connected to a normally closed relay.

[0008] As a further technical solution, the normally closed relay, the first normally open relay, and the second normally open relay are all four-pin relays, each including two coil terminals and two contact terminals.

[0009] As a further technical solution, the power supply is a vehicle-mounted power supply, providing a 12V DC voltage.

[0010] As a further technical solution, one end of the fault repair switch is grounded, and the other end is respectively connected to the coil terminals of the first normally open relay and the normally closed relay.

[0011] As a further technical solution, one end of the alarm light is grounded, and the other end is connected to the contact terminal of the first normally open relay and powered on.

[0012] As a further technical solution, another coil terminal of the normally closed relay is also connected to a power source.

[0013] As a further technical solution, one end of the key start switch is connected to a power source, and the other end is respectively connected to a coil terminal of a second normally open relay and a contact terminal of a normally closed relay.

[0014] As a further technical solution, the coil terminal of the second normally open relay is also connected to the coil terminal of the normally closed relay.

[0015] As a further technical solution, the contact terminal of the second normally open relay is also connected to a power source.

[0016] As a further technical solution, the circuit also includes a speaker connected in series with the instrument display and the contact terminal of the second normally open relay.

[0017] Beneficial effects of one or more of the above technical solutions:

[0018] (1) By setting a fault inspection switch to cooperate with the first normally open relay and the normally closed relay, when performing fault inspection, the fault inspection switch is closed, and the alarm light flashes to remind other personnel, and the power-on signal of the key start switch cannot reach the engine ECU, and the entire vehicle cannot be started.

[0019] (2) When other personnel ignore the warning light and try to start the vehicle, the power-on signal cannot reach the engine ECU and the vehicle cannot start. At this time, the second normally open relay closes, and the prompt message "under maintenance" is displayed on the instrument display, and the vehicle speaker is controlled to emit a buzzer to further remind other personnel.

[0020] (3) The circuit of the loader maintenance mode of the present application is simple and easy to install, and does not affect the normal operation of the loader vehicle circuit system. When the fault repair switch is not turned on, the vehicle can be started normally by the key start switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0022] Figure 1 This is a schematic diagram of the maintenance mode circuit of the utility model.

[0023] In the figure, 1 is a fault inspection switch; 2 is a key start switch; 3 is a normally closed relay; 4 is a first normally open relay; 5 is a second normally open relay; 6 is an engine controller; 7 is an instrument display; 8 is a warning light; and 9 is a speaker. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1, describing the specific implementation of this embodiment.

[0025] The present application embodiment provides a loader maintenance mode control circuit, referring to Figure 1 , a loader maintenance mode control circuit, including a power supply, a fault inspection switch 1, a key start switch 2, a normally closed relay 3, a first normally open relay 4, a second normally open relay 5, an engine controller 6, a warning light 7, an instrument display 8 and a speaker 9;

[0026] In this embodiment, a DC 12V voltage is provided by the vehicle power supply to power the entire maintenance mode control circuit. The normally closed relay 3, the first normally open relay 4, and the second normally open relay 5 are all four-pin relays, each including two coil terminals and two contact terminals. The first normally open relay 4 and the second normally open relay 5 are in an open state when no current passes through the relay coil, while the normally closed relay 3 is in a closed state when no current passes through the relay coil.

[0027] In the specific circuit connection process, one end of the fault inspection switch 1 is grounded, and the other end is connected to the coil terminal b of the first normally open relay 4 and the coil terminal k of the normally closed relay 3, wherein the first normally open relay 4 and the normally closed relay 3 are connected in parallel; the other coil terminal a of the first normally open relay 4 is connected to the power supply, and its two contact terminals c and d are connected to the power supply and the alarm light 8 respectively, and the other end of the alarm light 8 is grounded. Under normal circumstances, the first normally open relay 4 is in the disconnected state, and the alarm light 8 is not on; when the equipment inspection switch is closed, the negative pole of the first normally open relay 4 is turned on, and the current flows through the coil in the first normally open relay 4, so that the relay is in the closed state, and the alarm light is powered on and flashes.

[0028] Another coil terminal l of the normally closed relay 3 is connected to the power supply, one of the contact terminals m is connected to the power supply through the key start switch 2, and the other contact terminal n is connected to the engine controller 6. When the fault repair switch 1 is closed, the current in the normally closed relay 3 is conducted, so that the relay switch is in the off state, the engine power-on signal cannot be transmitted to the engine controller 6, and the loader engine cannot be started.

[0029] One of the coil terminals e of the second normally open relay 5 is connected to the power supply through the key start switch 2, and the other coil terminal f is connected to the coil terminal k of the normally closed relay 3. One of the contact terminals g of the second normally open relay 5 is connected to the power supply, and the other contact terminal h is connected to the instrument display 7 and the speaker 9. When the fault inspection switch 1 is closed, the loader key start switch 2 is closed, and the engine does not start at this time. At the same time, since the current of the second normally open relay 5 flows, the relay switch is closed, so that the instrument display 7 displays the words "under maintenance", and the speaker 9 emits a buzzer to remind the operator that the transfer machine is under maintenance at this time, so as to avoid the danger to the maintenance personnel caused by accidental start of the vehicle.

[0030] Working principle:

[0031] When the loader fails, the maintenance personnel first turn on the fault maintenance switch 1, so that the first normally open relay 4 is closed, and the vehicle warning light 8 is controlled to flash; due to the large size of the loader, when other personnel do not notice the loader warning light 8 signal and the maintenance personnel, and start the loader with the key, the fault maintenance switch 1 is closed, so that the normally closed relay 3 is disconnected, and then the power-on signal cannot be transmitted to the engine control circuit 6, so that other personnel cannot start the vehicle. At the same time, in the process of starting the loader with the key, the key start switch 2 is closed, so that the second normally open relay 5 is closed, and the prompt message "under maintenance" is displayed on the loader instrument display 7 at this time. At the same time, because the circuit is connected, the speaker 9 emits a buzzer to remind the operator that the vehicle is under maintenance, so as to avoid accidental start of the vehicle and put the maintenance personnel in danger.

[0032] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A loader maintenance mode control circuit, characterized in that: include: Power supply, troubleshooting switch, key start switch, normally closed relay, first normally open relay, second normally open relay, engine controller, warning lights and instrument display; The fault repair switch is connected to the first normally open relay and the normally closed relay respectively, the first normally open relay and the normally closed relay are connected in parallel; the second normally open relay and the normally closed relay are connected in series; The first normally open relay is also connected to the warning light and the power supply; the normally closed relay is also connected to the power supply and the engine controller; The second normally open relay is connected to a power source, a key start switch and an instrument display, and is connected to a normally closed relay.

2. A loader maintenance mode control circuit as claimed in claim 1, characterized in that: The normally closed relay, the first normally open relay and the second normally open relay are all four-pin relays, each including two coil terminals and two contact terminals.

3. A loader maintenance mode control circuit as claimed in claim 1, characterized in that: The power supply is a vehicle-mounted power supply, which provides a 12V DC voltage.

4. A loader maintenance mode control circuit as claimed in claim 1, characterized in that: One end of the fault repair switch is grounded, and the other end is connected to one of the coil terminals of the first normally open relay and the normally closed relay respectively.

5. A loader maintenance mode control circuit as claimed in claim 1, characterized in that: One end of the alarm light is grounded, and the other end is connected to one of the contact terminals of the first normally open relay, and the other contact terminal of the first normally open relay is connected to the power supply.

6. A loader maintenance mode control circuit as claimed in claim 1, characterized in that: The other coil terminal of the normally closed relay is also connected to a power source.

7. A loader maintenance mode control circuit as claimed in claim 1, characterized in that: One end of the key start switch is connected to a power source, and the other end is respectively connected to a coil terminal of the second normally open relay and a contact terminal of the normally closed relay.

8. A loader maintenance mode control circuit as claimed in claim 1, characterized in that: The coil terminal of the second normally open relay is also connected to the coil terminal of the normally closed relay.

9. A loader maintenance mode control circuit as claimed in claim 1, characterized in that: The contact terminal of the second normally open relay is also connected to a power source.

10. A loader maintenance mode control circuit as claimed in claim 1, characterized in that: The circuit also includes a speaker connected in series with the instrument display and the contact terminals of the second normally open relay.

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