Parking brake control circuit under remote control mode of loader

Abstract

The utility model discloses a parking brake control circuit in a loader remote control mode, which belongs to the technical field of automobile brake control and comprises a first relay, one end of a coil of the first relay is connected with a remote control enable switch, the other end of the coil of the first relay is connected with a ground wire, and one end of a normally closed contact of the first relay is connected with a parking switch. The other end of the first relay is connected with a coil of the second relay, a normally open contact of the first relay is connected with a remote control receiver, and the remote control receiver is connected with a power supply; one end of a coil of the second relay is connected with a normally-closed contact of the first relay, the other end of the coil of the second relay is connected with a ground wire, a normally-open contact of the second relay is suspended, one end of a normally-closed contact is connected with a power source, and the other end of the normally-closed contact is connected with the parking electromagnetic valve. Parking operation in the remote control mode and the vehicle end mode is achieved through the two relays, repeated superposition is avoided, the parking state of the vehicle end can be relieved in the remote control mode, and flexible switching between the parking state and the driving state is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile brake control, and in particular relates to a parking brake control circuit in a loader remote control mode. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] At present, when the loader is in remote control mode, it is directly connected to the parking switch in parallel, that is, the output pin wire of the controller controlling the parking is connected to the parking switch in parallel. Although this method is simple and direct, it cannot release the parking state of the vehicle-side mode in remote control mode, so that the loader can only perform remote control parking or driving operations when it is in the driving state of the vehicle-side mode. Utility Model Content

[0004] In order to solve the technical problems existing in the prior art, the utility model provides a parking brake control circuit in a remote control mode of a loader, which can release the parking state of the vehicle end in the remote control mode.

[0005] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0006] A parking brake control circuit in a loader remote control mode comprises a first relay, wherein one end of a coil of the first relay is connected to a remote control enable switch, and the other end is connected to a ground wire, one end of a normally closed contact of the first relay is connected to a parking switch, and the other end is connected to a coil of a second relay, and a normally open contact of the first relay is connected to a remote control receiver, and the remote control receiver is connected to a power supply; one end of a coil of the second relay is connected to a normally closed contact of the first relay, and the other end is connected to a ground wire, the normally open contact of the second relay is suspended, one end of the normally closed contact is connected to a power supply, and the other end is connected to a parking solenoid valve.

[0007] According to a further technical solution, a diode is connected in parallel to the coils of the first relay and the second relay.

[0008] According to a further technical solution, the remote control enabling switch is connected to a power source via a safety resistor.

[0009] According to a further technical solution, the normally closed contact of the second relay is connected to the power supply via a safety resistor.

[0010] According to a further technical solution, the parking brake control circuit further includes a parking status display circuit connected to the remote control receiver.

[0011] According to a further technical solution, the parking status display circuit includes a third relay, one end of the coil of the third relay is connected to the power supply, and the other end is connected to the parking pressure switch.

[0012] According to a further technical solution, one end of the normally open contact of the third relay is connected to a power source.

[0013] According to a further technical solution, one end of the normally closed contact of the third relay is suspended in the air, and the other end is respectively connected to the remote control receiver and the instrument.

[0014] According to a further technical solution, a diode is connected in parallel to the coil of the third relay.

[0015] According to a further technical solution, the remote control receiver receives a parking instruction and sends a remote control parking signal.

[0016] Beneficial effects of the utility model:

[0017] The utility model realizes parking operations in remote control mode and vehicle-side mode through two relays without repeated superposition. When the remote control enabling switch is turned on in remote control mode, the parking switch signal of the vehicle-side will be cut off and become invalid by the relay. The parking state of the vehicle-side when switching to remote control mode is judged by the remote control parking signal. The parking state of the vehicle-side can be released in remote control mode, and flexible switching between parking and driving states can be realized.

[0018] In the power-on initialization remote control mode, the utility model will not be unable to release the parking state remotely due to the parking operation on the vehicle side; there is also the parking operation in the remote control mode, which makes it impossible for the driver on the vehicle side to release the parking state. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0020] Figure 1 This is a parking brake control circuit diagram of an embodiment of the utility model.

[0021] Among them, 1-first relay, 2-second relay, 3-third relay, 4-remote control enable switch, 5-parking switch, 6-parking solenoid valve, 7-remote control receiver, 8-parking pressure switch, 9-instrument, 10-fuse resistor. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] See also Figure 1As shown, an embodiment of the utility model provides a parking brake control circuit in a loader remote control mode, comprising a first relay 1, wherein one end of the coil of the first relay 1 is connected to the remote control enable switch 4, and the other end is connected to the ground wire, one end of the normally closed contact of the first relay 1 is connected to the parking switch 5, and the other end is connected to the coil of the second relay 2, the normally open contact of the first relay 1 is connected to the remote control receiver 7, and the remote control receiver 7 is connected to a power supply; one end of the coil of the second relay 2 is connected to the normally closed contact of the first relay 1, and the other end is connected to the ground wire, the normally open contact of the second relay 2 is suspended, one end of the normally closed contact is connected to the power supply, and the other end is connected to the parking solenoid valve 6.

[0024] In this embodiment, the parking operation of the loader includes parking operations in remote control mode and vehicle-side mode. The parking operations in remote control mode and vehicle-side mode are realized by two relays without repeated superposition.

[0025] like Figure 1 As shown, the first relay 1 can also be called a mode switching relay, and the second relay 2 can also be called a parking solenoid valve 6 relay. The coils of the first relay 1 and the second relay 2 are both connected in parallel with a diode to protect them from damage to other components caused by power failure of the coils.

[0026] In this embodiment, the remote control enabling switch 4 is connected to the power supply through the fuse resistor 10, and the normally closed contact of the second relay 2 is connected to the power supply through the fuse resistor 10 to protect the circuit. Once an abnormal current appears in the circuit, the fuse resistor 10 will quickly blow when the current exceeds its rated value, thereby disconnecting the circuit and preventing the circuit components from being damaged by excessive current shock.

[0027] In this embodiment, the parking brake control circuit further includes a parking state display circuit connected to the remote control receiver 7, and the parking state display circuit includes a third relay 3, one end of the coil of the third relay 3 is connected to the power supply, and the other end is connected to the parking pressure switch 8, one end of the normally open contact of the third relay 3 is connected to the power supply, one end of the normally closed contact of the third relay 3 is suspended, and the other end is respectively connected to the remote control receiver 7 and the meter 9. The meter 9 is connected to the power supply and keeps powered.

[0028] The parking pressure switch 8 is a normally closed switch, and whether it is disconnected is determined according to the pressure value of the parking cylinder; the parking solenoid valve 6 is energized, the parking cylinder is started, and the parking air circuit is connected to realize the driving operation. At this time, the parking pressure switch 8 reaches the pressure closing threshold and disconnects, and controls the third relay 3, i.e., the parking pressure feedback relay contact to close, and sends a parking feedback signal to the remote control receiver 7 and the instrument 9. The instrument 9 judges the parking feedback signal and determines that it is a driving operation, and the instrument 9 cancels the display of the parking status light.

[0029] The coil of the third relay 3 is also connected in parallel with a diode to play a protective role and prevent the coil from being damaged by power failure.

[0030] It should be noted that the meter 9 uses the existing processing method to judge and process the parking feedback signal, and does not involve any improvement in the software program.

[0031] Working principle details:

[0032] The parking operation of the loader includes the parking operation in remote control mode and vehicle-side mode. The specific operation in vehicle-side mode is as follows:

[0033] When the remote control enable switch 4 is not turned on, that is, the remote control enable switch 4 is disconnected, it belongs to the vehicle-side operation mode, and the remote control mode operation control parking is controlled by the remote control enable switch 4 and the first relay 1. At this time, the vehicle-side can pull up the parking switch 5, that is, the parking switch 5 is closed. At this time, the remote control enable switch 4 is disconnected so that the coil of the first relay 1 is not energized, the normally closed contact of the first relay 1 is closed, and the normally open contact is disconnected, so that the coil of the second relay 2 is energized, the normally open contact is closed, and the normally closed contact is disconnected, so that the parking solenoid valve 6 is de-energized, the parking gas circuit is disconnected, and the parking operation is realized. At the same time, the cylinder pressure does not meet the disconnection condition of the parking pressure switch 8 (normally closed), the parking pressure switch 8 remains closed, the coil of the third relay 3 is energized, the normally open contact is disconnected, and the normally closed contact is closed. The third relay 3 sends the corresponding parking feedback signal to the remote control receiver 7 and the instrument 9. The instrument 9 judges the parking feedback signal to obtain the parking operation, and the instrument 9 displays the parking status light.

[0034] When the parking switch 5 is not pulled up, that is, the parking switch 5 is disconnected, the coil of the second relay 2 is not energized, the normally open contact is disconnected, and the normally closed contact is closed, so that the parking solenoid valve 6 is energized and the parking air circuit is connected to realize the driving operation. At the same time, the parking pressure switch 8 reaches the pressure closing threshold and disconnects, the third relay 3 loses power, the normally open contact is closed, and the normally closed contact is disconnected. The instrument 9 receives the parking feedback signal and determines the driving operation, and the instrument 9 cancels the parking status light.

[0035] In remote control mode, it is as follows:

[0036] When the remote control enable switch 4 is turned on, that is, the remote control enable switch 4 is closed, it belongs to the remote control operation mode. At this time, the coil of the first relay 1 is energized, the normally closed contact of the first relay 1 is disconnected, the normally open contact is closed, and the vehicle-side parking switch 5 signal is cut off by the relay and becomes invalid. The remote control receiver 7 realizes the parking action through the remote control parking signal; the remote control receiver 7 can receive the parking instruction (equivalent to the parking switch 5), and the execution logic is consistent with the vehicle-side operation. Specifically, the remote control receiver 7 receives the parking instruction and sends a remote control parking signal, so that the coil of the second relay 2 is energized, the normally open contact is closed, and the normally closed contact is disconnected, so that the parking solenoid valve 6 loses power, the parking gas circuit is disconnected, and the parking operation is realized. At the same time, the cylinder pressure does not meet the disconnection condition of the parking pressure switch 8 (normally closed), the parking pressure switch 8 remains closed, the coil of the third relay 3 is energized, the normally open contact is disconnected, and the normally closed contact is closed. The third relay 3 sends the corresponding parking feedback signal to the remote control receiver 7 and the instrument 9. The instrument 9 judges the parking feedback signal to obtain the parking operation, and the instrument 9 displays the parking status light.

[0037] The remote control receiver 7 receives the parking command and sends out a remote control parking signal, so that the coil of the second relay 2 is energized. Specifically, the remote control enable switch 4 is closed, so that the contact of the first relay 1 is switched from the parking switch 5 circuit to the remote control parking signal circuit. After receiving the parking command, the remote control receiver 7 sends out a remote control parking signal. The remote control parking signal outputs a high level, which is equivalent to power supply, so that the normally open contact of the second relay 2 is closed and the normally closed contact is disconnected, so that the parking solenoid valve 6 loses power and the parking air circuit is disconnected, thereby realizing the parking operation.

[0038] When the remote control receiver 7 does not receive the remote control parking signal, the coil of the second relay 2 is not energized, the normally open contact is disconnected, and the normally closed contact is closed, so that the parking solenoid valve 6 is energized and the parking air circuit is connected to realize the driving operation. At the same time, the parking pressure switch 8 reaches the pressure closing threshold and disconnects, the third relay 3 loses power, the normally open contact is closed, and the normally closed contact is disconnected. The instrument 9 receives the parking feedback signal and determines the driving operation, and the instrument 9 cancels the parking status light.

[0039] It should be noted that the remote control receiver and the instrument adopt the original devices on the loader. The receiving and judging signals of the remote control receiver and the instrument are all realized by the existing technology, and no improvement on the software program is involved.

[0040] 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 parking brake control circuit in remote control mode of a loader, characterized in that: It includes a first relay, one end of the coil of the first relay is connected to the remote control enable switch, and the other end is connected to the ground wire, one end of the normally closed contact of the first relay is connected to the parking switch, and the other end is connected to the coil of the second relay, the normally open contact of the first relay is connected to the remote control receiver, and the remote control receiver is connected to a power supply; one end of the coil of the second relay is connected to the normally closed contact of the first relay, and the other end is connected to the ground wire, the normally open contact of the second relay is suspended, one end of the normally closed contact is connected to the power supply, and the other end is connected to the parking solenoid valve.

2. A parking brake control circuit in a loader remote control mode as claimed in claim 1, characterized in that: A diode is connected in parallel to the coils of the first relay and the second relay.

3. The parking brake control circuit in the remote control mode of a loader according to claim 1, characterized in that: The remote control enabling switch is connected to a power source via a safety resistor.

4. The parking brake control circuit in the remote control mode of a loader according to claim 1, characterized in that: The normally closed contact of the second relay is connected to the power supply through a safety resistor.

5. The parking brake control circuit in the remote control mode of a loader according to claim 1, characterized in that: The parking brake control circuit also includes a parking state display circuit connected to the remote control receiver.

6. A parking brake control circuit in a loader remote control mode as claimed in claim 5, characterized in that: The parking state display circuit comprises a third relay, one end of a coil of the third relay is connected to a power source, and the other end is connected to a parking pressure switch.

7. A parking brake control circuit in a loader remote control mode as claimed in claim 6, characterized in that: One end of the normally open contact of the third relay is connected to the power supply.

8. The parking brake control circuit in the remote control mode of a loader according to claim 6, characterized in that: One end of the normally closed contact of the third relay is suspended, and the other end is connected to the remote control receiver and the instrument respectively.

9. The parking brake control circuit in the remote control mode of a loader according to claim 6, characterized in that: A diode is connected in parallel to the coil of the third relay.

10. The parking brake control circuit in the remote control mode of a loader according to claim 1, characterized in that: The remote control receiver receives the parking instruction and sends a remote control parking signal.

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