Automatic parking system, control method and forklift

Abstract

The invention discloses an automatic parking system which comprises a parking brake arranged on a drive axle, and the parking brake is connected with a parking hydraulic drive part and a parking control part. The hydraulic driving part comprises a hydraulic pump connected with a parking brake, and the hydraulic pump is communicated with the parking brake through a parking brake integrated valve block; the parking control portion comprises a vehicle controller, a parking switch, a relay and a neutral gear signal switch, the parking switch, the relay and the neutral gear signal switch communicate with the vehicle controller, the relay is connected with a parking electromagnetic valve, and the vehicle controller is in signal connection with a transmission controller. Automatic parking and contact power is supplied to the parking brake through the parking hydraulic driving part, the parking hydraulic driving part is controlled to act through the parking control part, and then manual parking and automatic parking can be achieved.

Description

Technical Field

[0001] This invention relates to the field of vehicle braking technology, specifically an automatic parking system, control method, and forklift. Background Technology

[0002] In the industrial material handling vehicle industry, users are paying increasing attention to the safe operation of vehicles. In addition to service brakes for use during driving, vehicles must also be equipped with parking brake systems to ensure that the vehicle does not roll away or cause other dangerous situations after it has come to a stop.

[0003] Manual parking can meet the daily operation needs of drivers. In order to improve driving comfort and assist drivers in parking in a timely manner, it is also necessary to realize automatic parking under certain conditions. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic parking system, a control method, and a forklift to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An automatic parking system includes a parking brake mounted on a drive axle, the parking brake being connected to a parking hydraulic drive unit and a parking control unit;

[0007] The hydraulic drive unit includes a hydraulic pump connected to the parking brake, and the pump is connected to the parking brake via a parking brake integrated valve block;

[0008] The parking control unit includes a vehicle controller and a parking switch, a relay, and a neutral signal switch connected to the vehicle controller. The relay is connected to a parking solenoid valve, and the vehicle controller is signal-connected to a transmission controller.

[0009] As a further aspect of the present invention: the vehicle controller is connected to a storage battery, pin a of the vehicle controller is connected to the storage battery through a second fuse, pin e of the vehicle controller is connected to a neutral signal switch, and the other end of the neutral signal switch is connected to the second fuse.

[0010] As a further aspect of the present invention: one end of the parking switch is connected to a storage battery via a first fuse, and pin a of the vehicle controller is connected to the parking switch.

[0011] As a further embodiment of the present invention: the parking solenoid valve is located inside the parking brake integrated valve block, one end of the parking battery valve is connected to the parking brake pipeline through the A1 oil port of the parking brake integrated valve block, the other end of the parking solenoid valve is connected to the hydraulic pump through the P1 oil port of the parking brake integrated valve block, and an accumulator is connected to the P1 oil port of the parking brake integrated valve block.

[0012] As a further embodiment of the present invention: the parking brake is mounted on the drive axle, the drive axle is connected to a drive axle input shaft, a brake caliper disc is fixedly connected to the drive axle input shaft, and the brake caliper disc is arranged in cooperation with the parking brake.

[0013] As a further aspect of the present invention: the parking brake includes a brake housing and a brake caliper disposed within the housing. The brake caliper is engaged with both sides of the brake caliper disc. The brake housing is provided with a brake piston for driving the brake caliper to clamp and a spring for resetting. The brake piston is connected to port A1 of the parking brake integrated valve block.

[0014] An automatic parking system control method includes the following steps:

[0015] Step 1: Check the parking switch signal. If there is no parking switch signal, proceed to Step 2.

[0016] Step 2: Detect the neutral signal through the vehicle controller. If the vehicle is in neutral, proceed to step 3.

[0017] Step 3: Detect the vehicle speed signal through the vehicle controller. If the vehicle speed is less than V and the duration exceeds T, then trigger automatic parking.

[0018] Step 4: Activate the parking brake to achieve automatic parking.

[0019] As a further aspect of the present invention: in step 1, the parking switch signal is detected by the parking switch. If the parking switch signal is not detected, it means that no manual parking operation has been performed, and automatic parking control is required. In step 2, the neutral signal is detected by the neutral signal switch.

[0020] As a further aspect of the present invention: in step 3, the vehicle speed threshold V ranges from 0.5 to 1 km / h, and the maintenance threshold T ranges from 2 to 4 seconds.

[0021] A forklift equipped with the above-described automatic parking system and controlled by the above-described automatic parking system control method.

[0022] Compared with the prior art, the beneficial effects of the present invention are: by setting a parking brake, a parking hydraulic drive unit, and a parking control unit, the parking hydraulic drive unit provides power to the parking brake for automatic parking and contact, and the parking control unit controls the operation of the parking hydraulic drive unit, thereby realizing manual parking and automatic parking. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the automatic parking control system in this embodiment;

[0024] Figure 2 This is a schematic diagram of the parking hydraulic principle in this embodiment;

[0025] Figure 3 This is a schematic diagram of the parking brake installation in this embodiment;

[0026] Figure 4 This is the automatic parking control logic diagram for this embodiment.

[0027] In the diagram: 1-Battery, 2-First fuse, 3-Second fuse, 4-Parking switch, 5-Parking solenoid valve, 6-Relay, 7-Vehicle controller, 8-Neutral signal switch, 9-Transmission controller, 10-Parking brake integrated valve block, 11-Hydraulic pump, 12-Accumulator, 13-Parking brake, 14-Parking brake mounting plate, 15-Drive axle input shaft, 16-Brake caliper disc, 17-Drive axle. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1-4 In this embodiment of the invention, an automatic parking system includes a parking brake 13 disposed on a drive axle 20, the parking brake 13 being connected to a parking hydraulic drive unit and a parking control unit.

[0030] The parking control unit includes a battery 1, a first fuse 2, a second fuse 3, a parking switch 4, a parking solenoid 5, a relay 6, a vehicle controller 7, and a neutral signal switch 8.

[0031] The vehicle controller 7 includes a parking switch 4, a relay 6, and a neutral signal switch 8 connected to it. The relay 6 is connected to a parking solenoid valve 5. The vehicle controller 7 is connected to a transmission controller 9. The vehicle controller 7 is connected to a battery 1. Pin a of the vehicle controller 7 is connected to the battery 1 through a second fuse 3. Pin e of the vehicle controller 7 is connected to the neutral signal switch 8. The other end of the neutral signal switch 8 is connected to the second fuse 3. One end of the parking switch 4 is connected to the battery 1 through a first fuse 2. Pin a of the vehicle controller 7 is connected to the parking switch 4.

[0032] In this embodiment, the positive terminal of battery 1 is connected to one end of the first fuse 2 and the second fuse 3. The other end of the first fuse 2 is connected to pin 5 of the parking switch 4. The other end of the second fuse 3 is connected to one end of the neutral signal switch 8 and pin b of the vehicle controller 7. The other end of the neutral signal switch 8 is connected to pin e of the vehicle controller 7. Pin 1 of the parking switch 4 is connected to pin a of the vehicle controller 7. Pin 7 of the parking switch 4 is connected to one end of the parking solenoid valve 5 and pin 85 of the relay 6. The other end of the parking solenoid valve 5 is connected to pin 30 of the common contact of the relay 6. The normally closed contact 87a of the relay 6 is connected to the negative terminal of battery 1. Pin 86 of the relay 6 is connected to pin c of the vehicle controller 7, and pin d of the vehicle controller 7 is connected to the negative terminal of battery 1.

[0033] The type of pin a of vehicle controller 7 is digital input, and its state is either floating or high level input. The contact type of relay 6 is 1 normally open and 1 normally closed. The type of pin c of vehicle controller 7 is digital output, and its state is either floating or grounded. The type of pin e of vehicle controller 7 is digital input, and its state is either floating or high level input. The parking switch is a single-pole double-throw switch, and the switch model is JK931-183-2.32.

[0034] The hydraulic drive unit includes a hydraulic pump 11 connected to the parking brake 13. The pump 11 is connected to the parking brake 13 via the parking brake integrated valve block 10. The parking solenoid valve 5 is located inside the parking brake integrated valve block 10. One end of the parking solenoid valve 5 is connected to the parking brake 13 pipeline via the A1 oil port of the parking brake integrated valve block 10. The other end of the parking solenoid valve 5 is connected to the hydraulic pump 11 via the P1 oil port of the parking brake integrated valve block 10. The P1 oil port of the parking brake integrated valve block 10 is connected to an accumulator 12. The T port of the parking brake integrated valve block 10 is connected to the oil tank. The A2 port of the parking brake integrated valve block 10 can be connected to the low parking pressure alarm switch. The A3 and A4 ports of the parking brake integrated valve block 10 are spare interfaces.

[0035] The parking brake 13 is mounted on the drive axle 17, which is connected to the drive axle input shaft 15. A brake caliper disc 16 is fixedly connected to the drive axle input shaft 15. The brake caliper disc 16 is arranged in conjunction with the parking brake 13. The parking brake 13 includes a brake housing and a brake caliper disposed within the housing. The brake caliper is engaged with both sides of the brake caliper disc 16. The brake housing contains a brake piston for driving the brake caliper to clamp and a spring for resetting. The brake piston is connected to port A1 of the parking brake integrated valve block 10.

[0036] In this embodiment, the drive axle 17 is connected to the forklift, the parking brake 13 is connected to the drive axle 17 through the parking brake mounting plate 14, the brake caliper disc 16 is connected to the drive axle input shaft 15 through bolts, and the A1 port of the parking brake integrated valve block 10 is connected to the oil inlet on the parking brake 13 through a hydraulic hose.

[0037] When pressurized oil enters the oil chamber of the parking brake, the pressure pushes the piston to compress the spring, increasing the distance between the brake caliper disc and the brake disc to disengage from the brake caliper, allowing the drive axle input shaft to rotate freely.

[0038] When the pressurized oil does not enter the oil chamber of the parking brake, the spring pushes the piston to move, the distance between the brake caliper discs decreases, and pressure is generated between the brake caliper discs. Due to the friction, the drive axle input shaft cannot rotate, thus achieving parking.

[0039] The parking brake process in this embodiment:

[0040] Parking release: When the vehicle is powered on, the parking switch 4 is switched to position 7, the parking solenoid valve 5 is energized, and pressurized oil enters the oil chamber of the parking brake 13 from port A1 of the parking brake integrated valve block 10. Under the action of the pressurized oil, the brake caliper disc 16 disengages from the brake caliper, the drive axle input shaft 15 can rotate freely, and the vehicle can be driven after being put into gear.

[0041] Manual parking: When the vehicle is powered on, the parking switch 4 is switched to position 1, the parking solenoid valve 5 is de-energized, and the hydraulic oil returns to the oil tank through the T-port of the parking brake integrated valve block 10. The spring pushes the piston to move, the brake caliper disc 16 clamps, and pressure is generated between the brake caliper and the brake caliper. Due to the friction, the drive axle input shaft 15 cannot rotate, thus achieving manual parking.

[0042] Automatic parking: When the vehicle is in motion, the brake is applied and the vehicle speed is less than V and maintained for a time T. After the gear lever is returned to neutral, the pin C of the vehicle controller 7 outputs a low level, the coil of the relay 6 is energized, the solenoid valve 5 is de-energized, and the hydraulic oil returns to the oil tank through the T port of the parking brake integrated valve block 10. The spring pushes the piston to move, the brake caliper disc 16 clamps, and pressure is generated between it and the brake caliper. Due to the friction, the drive axle input shaft 15 cannot rotate, thus realizing automatic parking.

[0043] An automatic parking system control method includes the following steps:

[0044] Step 1: Check the parking switch signal. If there is no parking switch signal, proceed to Step 2.

[0045] The parking switch signal is detected by parking switch 4. If no parking switch signal is detected, it means that no manual parking operation has been performed, and automatic parking control is required.

[0046] Step 2: Detect the neutral signal through the vehicle controller and the neutral signal switch 8. If the vehicle is in neutral, proceed to step 3.

[0047] Step 3: Detect the vehicle speed signal through the vehicle controller. If the vehicle speed is less than V and the duration exceeds T, trigger automatic parking. The vehicle speed threshold V ranges from 0.5 to 1 km / h, and the duration threshold T ranges from 2 to 4 seconds.

[0048] Step 4: Activate the parking brake to achieve automatic parking.

[0049] A forklift equipped with the aforementioned automatic parking system and controlled using the aforementioned automatic parking system control method.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic parking system, comprising a parking brake (13) disposed on a drive axle (20), characterized in that, The parking brake (13) is connected to a parking hydraulic drive unit and a parking control unit; The hydraulic drive unit includes a hydraulic pump (11) connected to the parking brake (13), and the pump (11) is connected to the parking brake (13) via the parking brake integrated valve block (10); The parking control unit includes a vehicle controller (7) and a parking switch (4), a relay (6), and a neutral signal switch (8) connected to the vehicle controller (7). The relay (6) is connected to a parking solenoid valve (5), and the vehicle controller (7) is signal connected to a transmission controller (9).

2. The automatic parking system according to claim 1, characterized in that, The vehicle controller (7) is connected to a battery (1). The a pin of the vehicle controller (7) is connected to the battery (1) through a second fuse (3). The e pin of the vehicle controller (7) is connected to a neutral signal switch (8). The other end of the neutral signal switch (8) is connected to the second fuse (3).

3. The automatic parking system according to claim 1, characterized in that, One end of the parking switch (4) is connected to the battery (1) through the first fuse (2), and pin a of the vehicle controller (7) is connected to the parking switch (4).

4. An automatic parking system according to claim 1, characterized in that, The parking solenoid valve (5) is located inside the parking brake integrated valve block (10). One end of the parking battery valve (5) is connected to the parking brake (13) pipeline through the A1 oil port of the parking brake integrated valve block (10). The other end of the parking solenoid valve (5) is connected to the hydraulic pump (11) through the P1 oil port of the parking brake integrated valve block (10). The P1 oil port of the parking brake integrated valve block (10) is connected to an accumulator (12).

5. An automatic parking system according to claim 1, characterized in that, The parking brake (13) is mounted on the drive axle (17), the drive axle (17) is connected to the drive axle input shaft (15), and a brake caliper disc (16) is fixedly connected to the drive axle input shaft (15). The brake caliper disc (16) is arranged in cooperation with the parking brake (13).

6. An automatic parking system according to claim 5, characterized in that, The parking brake (13) includes a brake housing and a brake caliper disposed in the housing. The brake caliper is engaged with both sides of the brake caliper disc (16). The brake housing is provided with a brake piston for driving the brake caliper to clamp and a spring for resetting. The brake piston is connected to the A1 port of the parking brake integrated valve block (10).

7. An automatic parking system control method using the automatic parking system according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Check the parking switch signal. If there is no parking switch signal, proceed to Step 2. Step 2: Detect the neutral signal through the vehicle controller. If the vehicle is in neutral, proceed to step 3. Step 3: Detect the vehicle speed signal through the vehicle controller. If the vehicle speed is less than V and the duration exceeds T, then trigger automatic parking. Step 4: Activate the parking brake to achieve automatic parking.

8. The automatic parking system control method according to claim 7, characterized in that, In step 1, the parking switch signal is detected by the parking switch (4). If the parking switch signal is not detected, it means that no manual parking operation is performed and automatic parking control is required. In step 2, the neutral signal is detected by the neutral signal switch (8).

9. The automatic parking system control method according to claim 7, characterized in that, In step 3, the vehicle speed threshold V ranges from 0.5 to 1 km / h, and the maintenance threshold T ranges from 2 to 4 seconds.

10. A forklift according to claim 1, characterized in that, Install the automatic parking system according to any one of claims 1-6, and use the automatic parking system control method according to any one of claims 7-9.

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