CN108297852B - A ramp parking device for a trailer-type RV and its control method - Google Patents

Abstract

The invention provides a ramp parking device for a pull type motor home and a control method thereof, wherein the ramp parking device comprises a detection mechanism, an execution mechanism and an ECU; when a motor, a gear, a steel wire disc and other mechanisms are mounted on the frame of a rear car of a recreational vehicle, and when the front car is braked by pulling a hand brake on a ramp parking, the ECU controls an electromagnetic relay b, an electromagnetic relay c is combined with an electromagnetic clutch a, the motor rotates the gear a to drive the steel wire disc to rotate and move a steel wire, and finally a brake shoe is combined with a wheel hub to realize the parking of the rear car. After parking is finished, the steel wire disc is locked by the one-way locking device, and backward slipping is prevented. At the same time, the electromagnetic relay b and the electromagnetic relay c are turned off. When the parking state is released, the hand brake is loosened, the ECU controls the electromagnetic clutch a to be disconnected, the electromagnetic relay a, the electromagnetic relay d and the electromagnetic clutch b are combined, the motor rotates reversely, the brake shoe and the hub are released from a contact state, and the parking state is released. The convenience and the safety of the driver of the pull type caravan in the parking on the ramp are improved.

Description

A ramp parking device for a trailer-type RV and its control method

technical field

The invention belongs to the research field of parking technology, and in particular relates to a ramp parking device for a trailer-type RV and a control method thereof.

Background technique

Parking, as a basic performance requirement of automobiles, has been widely used in ordinary automobiles. If the car is parked erratically, there is a danger of back slipping, which in some cases can cause traffic jams and accidents. Most of the parking methods of ordinary cars are to pull the handbrake to drive the steel wire, so that the brake shoe is in contact with the wheel hub to achieve parking. However, the structure of the trailer-type RV is that the front car and the carriage are connected by hooks and wires. Therefore, its parking method is generally that the driver first pulls the handbrake to park the front car, and then the driver gets off the car to the rear. Add some obstacles to the car to make it unable to move to achieve parking. With this parking method, when the driver parks on a relatively large slope, he needs to have a passenger get off the car and add obstacles to the wheels of the rear car to prevent the vehicle from sliding backward while pressing the brakes himself. The driver cannot complete the parking by himself. , this way of parking poses a safety hazard. The existing trailer type RV parking, such as the patent application number 201621075601.X, is to add a parking leg under the frame, and the driver pulls the lever to support the leg on the ground to stabilize the RV. This parking method still requires someone to get off the car and pull the lever. When the driver gets off the car, there is still a danger of slipping back, and it cannot solve the problem of parking on a large slope. The patent application number is 200980136272.1, which uses air pressure to park the car by designing the valve. This parking method has a complex structure and high cost. The invention transmits information between the front and rear vehicles, uses the motor to provide power to pull the wire, has simple structure and low cost, is convenient for the driver to park, and also improves the safety of parking.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a ramp parking device for a trailer-type RV and a control method thereof in view of the above problems. It is convenient for the driver to park, and at the same time, it can ensure the safety of parking, and it can also ensure that the RV will not be in a dangerous situation such as back slipping or diving when parking on a relatively steep slope. The technical scheme of the present invention is that when the trailer-type RV is parked on a ramp, according to Newton's laws of mechanics, the braking force required for parking is determined from the weight of the rear car and the slope it is on, and when the front car pulls the handbrake, Control the rear car to pull the wire, so that the braking force of the front and rear cars is equal to the required braking force, so as to achieve safe synchronous parking.

The technical scheme of the present invention is: a ramp parking device for a trailer-type RV, comprising a detection mechanism, an executive mechanism, and an ECU;

The actuator includes a motor, gear a, gear b, gear c, gear d, one-way locking device, electromagnetic clutch a, electromagnetic clutch b, electromagnetic relay a, electromagnetic relay b, electromagnetic relay c, electromagnetic relay d, steel wire and brake shoes; the motor transmits power to the wire disc through the electromagnetic clutch a, and drives the wire disc to rotate in forward and reverse directions; the one-way locking device is fixedly installed on the rotating shaft between the motor and the electromagnetic clutch a, so the The one-way locking device prevents the electromagnetic clutch a from driving the wire disc to rotate in the opposite direction; the gear a is fixedly installed on the rotating shaft between the one-way locking device and the electromagnetic clutch a, and the gear b is fixedly installed on the rotating shaft connected to the wire disc and located behind the wire disc; gear d meshes with gear a, and gear d transmits power to gear c through electromagnetic clutch b, gear c meshes with gear b; the wire disc is wound with wire, and the wire is connected to the brake hoof connection;

The detection mechanism detects the weight M of the rear vehicle, the angle y of the ramp, the position of the handbrake and the rotational speed w of the wire disc, and sends the detected signal to the ECU;

The ECU includes an input module, a calculation module and an output module; the output module is respectively electrically connected to the motor, the electromagnetic relay a, the electromagnetic relay b, the electromagnetic relay c, the electromagnetic relay d, the electromagnetic clutch a and the electromagnetic clutch b; It is used to receive the position signal of the handbrake detected by the detection mechanism, the vehicle weight M of the rear vehicle, the angle y of the ramp and the rotational speed w of the wire disc, and send them to the calculation module. The calculation module calculates the parking required by the rear vehicle according to the received signal. Force F and the displacement stroke s' of the required pulling wire, and compare the displacement stroke s' of the required pulling wire with the displacement s that the wire has moved. According to the comparison result, the output module sends information to control the electromagnetic relay a and the electromagnetic relay b respectively. , electromagnetic relay c, electromagnetic relay d, electromagnetic clutch a and electromagnetic clutch b are combined or disconnected, and the forward and reverse rotation of the motor.

In the above solution, the detection mechanism includes a load cell, a level, a handbrake switch sensor and a rotational speed sensor;

The load sensor is used to detect the rear vehicle weight M; the level is used to detect the angle y of the ramp; the handbrake switch sensor is used to detect the position of the handbrake; the rotational speed sensor is used to detect the rotational speed w of the wire disc; The load sensor, the level gauge, the handbrake switch sensor and the rotational speed sensor are respectively connected with the input module of the ECU.

In the above solution, the one-way locking device includes a hinge, a locking outer wall, a locking rib, a return spring, a limit block, a locking steel plate and a locking shaft;

The locking outer wall is circular, the locking shaft is located in the locking outer wall, and a number of locking ribs are installed on the circumference of the locking shaft, a number of locking steel plates are installed on the inner side of the locking outer wall, and one side of the locking steel plate is installed. It is hinged with the locking outer wall; the locking shaft drives the locking rib to move forward, and the locking rib squeezes the locking steel plate; one end of the return spring is fixedly installed on the inner side of the locking outer wall, and the other end is against the Below the locking steel plate; one side of the limit block is installed on the inner side of the locking outer wall, the locking shaft moves counterclockwise, the locking rib drives the locking steel plate to move toward the limit block, and the other side of the limit block blocks The other side of the locking plate moves in the opposite direction.

In the above solution, the number of the locking ribs and the locking steel plates is four.

In the above scheme, the motor is fixed on the frame of the rear vehicle;

In the above solution, the rotating shaft is combined with the inner ring of the bearing, and the outer ring of the bearing is welded on the frame of the rear vehicle.

A control method according to the ramp parking device for a trailer-type RV, comprising a parking step;

The parking steps are as follows:

Step S1, the detection mechanism transmits the detected handbrake signal, the vehicle weight M of the rear vehicle, and the angle y of the ramp to the input module of the ECU, and the input module transmits the received signal to the calculation module, and the calculation module determines the parking requirements. the braking force F, and judge the actual displacement stroke s' of the required pulling wire;

Step S2, the output module of the ECU sends a signal to the electromagnetic relay b, the electromagnetic relay c and the electromagnetic clutch a, the electromagnetic relay b, the electromagnetic relay c and the electromagnetic clutch a are respectively combined, the rear vehicle power supply supplies power to the motor, and the motor drives the gear a to rotate in the forward direction , the gear a drives the wire disc to rotate through the electromagnetic clutch a, and the wire disc pulls the wire;

Step S3, the ECU input module receives the rotational speed w signal of the steel wire disc detected by the detection mechanism, and transmits it to the calculation module, the calculation module calculates the displacement s ₁ of the steel wire, and when s ₁ =s', the output module of the ECU sends the electromagnetic relay b, The electromagnetic relay c sends a signal, the electromagnetic relay b and the electromagnetic relay c are disconnected respectively, the electromagnetic clutch a remains connected, and the one-way locking device prevents the electromagnetic clutch a from rotating in the reverse direction, thereby locking the wire disc, preventing the wire from pulling the wire disc, and realizing the standstill. car.

In the above solution, the step of releasing the parking state is also included;

The steps for releasing the parking state are as follows:

Step S4, when the input module of the ECU detects that the handbrake signal input by the detection mechanism changes from presence to absence, the output module sends a signal to the electromagnetic relay a, the electromagnetic relay d and the electromagnetic clutch b, and the electromagnetic relay a, the electromagnetic relay d and the electromagnetic clutch b. b are combined respectively, send a signal to electromagnetic clutch a, electromagnetic clutch a is disconnected, the rear vehicle power control motor reverses, the motor drives gear a, gear a drives gear d to rotate, gear d drives gear c to rotate through electromagnetic clutch b, and gear c rotates. Drive the gear b to rotate, and the gear b drives the wire disc to move, so that the wire moves in the opposite direction;

Step S5, the detection mechanism sends the rotational speed w signal of the wire disc to the input module of the ECU, and the input module transmits the rotational speed w signal to the calculation module, and the calculation module calculates the displacement stroke s ₂ of the wire; when s ₂ =s' When the ECU output module sends a signal to the electromagnetic relay a, the electromagnetic relay d and the electromagnetic clutch b, the electromagnetic relay a, the electromagnetic relay d and the electromagnetic clutch b are respectively disconnected, and the parking state is released.

In the above scheme, the calculation formula of the braking force F required for parking is:

F=M·g·siny

Among them, M is the weight of the rear vehicle, y is the angle of the ramp, and g is the acceleration of gravity.

In the above scheme, the calculation formula of the actual displacement stroke s' of the pulling wire is:

s′=s″+e

Among them, e is the limit error of the one-way locking device, e=1/4·π·d, and d is the diameter of the inner ring of the wire disc;

s" is the required displacement calculated by the calculation module according to the braking force F; therefore,

s'=s"+1/4·π·d.

Compared with the prior art, the beneficial effects of the present invention are:

1. Compared with the driver who needs to get off the car to control the rear car to park, the device of the present invention can realize the simultaneous parking of the front and rear cars by the driver pulling the handbrake, which improves the driver's parking convenience.

2. Compared with a parking method such as adding obstacles to the rear wheels to prevent the RV from slipping backward, the device of the present invention adopts an active control method, judges the required parking force through the ECU, and controls the motor to rotate and pull the wire, Make the braking force meet the required parking force and improve the safety of parking.

3. The device of the present invention adopts the method of pulling the steel wire to park by mechanical motion, which improves the stability of parking.

4. The structure of the device of the present invention is relatively simple, which is convenient for installation and maintenance.

5. Compared with directly pulling the displacement of the steel wire to the maximum, the present invention can flexibly control the parking force, reduce the pressure on the steel wire and the brake shoe, and better protect the parking device.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Figure 2 is a schematic structural diagram of a locking device;

3 is a schematic structural diagram of the electronic control system of the present invention;

Figure 4 is a flowchart of the parking operation;

Fig. 5 is the power transmission diagram of the parking state;

FIG. 6 is a power transmission diagram in a released parking state.

In the figure, 1. Load sensor; 2. Level gauge; 3. Handbrake switch sensor; 4. Rear vehicle power supply; 5. Electromagnetic relay a; 6. Electromagnetic relay b; 7. Motor; 8. Gear a; 9. One-way lock 901, hinge; 902, lock outer wall; 903, lock rib; 904, return spring; 905, limit block; 906, lock steel plate; 907, lock shaft 10, electromagnetic clutch a; 11 , brake shoe; 12, steel wire; 13, speed sensor; 14, gear b; 15, gear c; 16, wire disc; 17, electromagnetic clutch b; 18, gear d; 19, electromagnetic relay c; 20, electromagnetic relay d; 21. ECU.

Detailed ways

The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

FIG. 1 shows an embodiment of the ramp parking device for a trailer-type RV according to the present invention, and the ramp-parking device for the trailer-type RV includes a detection mechanism, an actuator, and an electronic control unit. Unit ECU21.

The detection mechanism includes a load sensor 1, a level 2, a handbrake switch sensor 3 and a rotational speed sensor 13; the load sensor 1 is used to detect the weight M of the rear vehicle; the level 2 is used to detect the angle y of the ramp; the The handbrake switch sensor 3 is used to detect the position of the handbrake; the rotational speed sensor 13 is used to detect the rotational speed w of the wire disc 16 ; The detection mechanism sends the detected weight M of the rear vehicle, the angle y of the ramp, the position of the handbrake and the rotational speed w of the wire disc 16 to the ECU 21 .

The actuator includes a rear vehicle power supply 4, a motor 7, a gear a8, a gear b14, a gear c15, a gear d18, a one-way locking device 9, an electromagnetic clutch a10, an electromagnetic clutch b17, an electromagnetic relay a5, an electromagnetic relay b6, an electromagnetic clutch Relay c19, electromagnetic relay d20, steel wire 12 and brake shoe 11. The rear vehicle power supply 4 is used to supply power to the motor 7 . The motor 7 is fixed on the frame of the rear vehicle, and can realize forward and reverse rotation by exchanging the positive and negative poles of the power supply. The motor 7 transmits power to the wire disc 16 through the electromagnetic clutch a10, and drives the wire disc 16 to rotate forward and reverse. The gear is mounted on the rotating shaft, and forms a power transmission route with the one-way locking device 9 and the electromagnetic clutch. The one-way locking device 9 is fixedly installed on the rotating shaft between the motor 7 and the electromagnetic clutch a10, and the one-way locking device 9 prevents the electromagnetic clutch a10 from driving the wire disc 16 to rotate in the reverse direction; the gear a8 is fixedly installed on the rotating shaft. On the rotating shaft between the one-way locking device 9 and the electromagnetic clutch a10, the gear b14 is fixedly installed on the rotating shaft connected to the wire disc 16, and is located behind the wire disc 16; the gear d18 meshes with the gear a8, and the gear d18 passes through the electromagnetic The clutch b17 transmits power to the gear c15, which meshes with the gear b14; the wire disc 16 is wound around the wire 12, and the wire 12 is connected with the brake shoe 11; the brake shoe 11 is used to combine with the hub to generate Braking force. The rotating shaft is combined with the inner ring of the bearing, and the outer ring of the bearing is welded on the frame.

As shown in FIG. 2 , the one-way locking device 9 is used to lock the wire drum 16 when parking is completed. The one-way locking device 9 includes a hinge 901 , a locking outer wall 902 , a locking rib 903 , a return spring 904 , a limit block 905 , a locking steel plate 906 and a locking shaft 907 .

The locking outer wall 902 is fixed on the frame, the locking outer wall 902 is circular, the locking shaft 907 is located in the locking outer wall 902, and four locking ribs 903 are installed on the circumference of the locking shaft 907, Four locking steel plates 906 are installed on the inner side of the locking outer wall 902, and one side of the locking steel plates 906 is hinged with the locking outer wall 902; the locking shaft 907 drives the locking rib 903 to move forward, and the locking rib 903 squeezes Press the locking steel plate 906; one end of the return spring 904 is fixedly installed on the inner side of the locking outer wall 902, and the other end abuts under the locking steel plate 906; one side of the limit block 905 is installed on the locking outer wall 902. On the inner side, the locking shaft 907 moves counterclockwise, the locking rib 903 drives the locking steel plate 906 to move toward the limit block 905 , and the other side of the limit block 905 blocks the reverse movement of the other side of the locking steel plate 906 .

When the gear a8 rotates forward, the locking shaft 907 drives the locking rib 903 to move clockwise, the locking rib 903 squeezes the locking steel plate 906, and the locking steel plate 906 presses the spring to move downward. After the locking rib 903 is separated from the locking steel plate 906 , the locking steel plate 906 returns to the original position under the action of the return spring 904 . When the locking shaft 907 moves counterclockwise, the locking rib 903 will drive the locking steel plate 906 to move toward the limit block 905. When the locking steel plate 906 is combined with the limit block 905, the locking shaft 907 will be locked. and cannot move, so that the rotating shaft connected to it cannot drive the wire disc 16 to rotate in the opposite direction through the electromagnetic clutch a10, thereby locking the wire disc 16.

Due to the gap between the locking ribs 903, there will be a certain locking error e. After the positive rotation of the locking shaft 907 is completed, the wire 12 will pull the wire disc 16 to rotate in the reverse direction, driving the locking shaft of the one-way locking device 9. 907 rotates in the opposite direction, thereby driving the locking rib 903 to rotate. The locking rib 903 further drives the locking steel plate 906 to move to make it combine with the limit block 905, and finally the locking 907 shaft is locked. Therefore, the gap between the locking ribs 903 determines the magnitude of the locking error e. The larger the number of locking ribs 903, the smaller the locking error, but it will increase the manufacturing difficulty and increase the manufacturing cost. The smaller the number of locking ribs 903, the greater the locking error. The preferred number of locking ribs 903 is four. The locking error is small, and the manufacturing difficulty and manufacturing cost are not increased.

As shown in FIG. 3, the electronic control unit ECU21 includes an input module, a calculation module and an output module. The output module is respectively electrically connected with the motor 7, the electromagnetic relay a5, the electromagnetic relay b6, the electromagnetic relay c19, the electromagnetic relay d20, the electromagnetic clutch a10 and the electromagnetic clutch b17; the input module is used to receive the rear vehicle weight M, The angle y of the ramp, the position of the handbrake and the rotational speed w of the wire disc 16 are sent to the calculation module. '.

Among them, the braking force F required for parking can be used as the formula:

F=M·g·siny

The calculation module calculates the required displacement s" according to the braking force F. Since the one-way locking device 9 has a certain limit error e, where d is the diameter of the inner ring of the wire disc, the calculation of the actual displacement stroke s' of the pulling wire The formula is:

s′=s″+e,

Among them, e=1/4·π·d

Therefore, s'=s"+1/4·π·d

The displacement s can be calculated by the following formula:

s=π·d∫wdt,

Wherein t is the time, d is the diameter of the inner ring of the wire disc 16; w is the rotational speed of the wire disc 16;

At the same time, the calculation module needs to compare the calculated actual displacement stroke s' of the pulling wire with the displacement s that the wire has moved. In the case that s' is greater than s, the control device continues to work, and when s' is equal to s, the device is stopped. Work. The output module sends information to control electromagnetic relay a5, electromagnetic relay b6, electromagnetic relay c19, electromagnetic relay d20, electromagnetic clutch a10 and electromagnetic clutch b17 to connect or disconnect, and the forward and reverse rotation of motor 7 respectively.

As shown in FIG. 4 , according to the control method of the ramp parking device for a trailer-type RV, it includes a parking step and a step of releasing the parking state.

The parking step specifically includes the following processes:

Step S1, the handbrake switch sensor 3 of the detection mechanism detects the position of the handbrake, the load sensor 1 detects the vehicle weight M of the rear vehicle, the level gauge 2 detects the angle y of the ramp, and the detection mechanism detects the detected handbrake signal and the rear vehicle. The vehicle weight M and the slope angle y are transmitted to the input module of the ECU21, and the input module transmits the received signal to the calculation module. The calculation module judges the braking force F required for parking according to the rear vehicle weight M and the slope angle y , judging the actual displacement stroke s' of the required pulling wire;

Step S2, the output module of the ECU 21 sends a signal to the electromagnetic relay b6, the electromagnetic relay c19 and the electromagnetic clutch a10, the electromagnetic relay b6, the electromagnetic relay c19 and the electromagnetic clutch a10 are respectively combined, the rear vehicle power supply 4 supplies power to the motor 7, and the motor 7 drives the gear a8 Forward rotation, the gear a8 drives the wire disc 16 to rotate through the electromagnetic clutch a10 through the rotating shaft and the one-way locking device 9, and the wire disc 16 pulls the wire 12; the power transmission route in the parking state is shown in Figure 5;

Step S3, the input module of the ECU 21 receives the rotational speed w of the wire disc 16 detected by the rotational speed sensor 13 of the detection mechanism, and transmits it to the calculation module. The calculation module calculates the displacement s ₁ of the wire 12. When s ₁ =s', the output module of the ECU 21 Send a signal to the electromagnetic relay b6 and the electromagnetic relay c19, the electromagnetic relay b6 and the electromagnetic relay c19 are respectively disconnected, the electromagnetic clutch a10 remains connected, and the one-way locking device 9 prevents the electromagnetic clutch a10 from rotating in the reverse direction, thereby locking the wire disc 16, preventing The wire 12 pulls the wire disc 16 to realize parking.

The step of releasing the parking state specifically includes the following processes:

Step S4, when the input module of the ECU 21 detects that the handbrake signal input by the detection mechanism changes from presence to absence, the output module sends signals to the electromagnetic relay a5, the electromagnetic relay d20 and the electromagnetic clutch b17, and the electromagnetic relay a5, the electromagnetic relay d20 and the electromagnetic clutch b17. b17 are combined respectively to send a signal to the electromagnetic clutch a10, the electromagnetic clutch a10 is disconnected, the rear vehicle power supply 4 controls the motor 7 to reverse, the motor 7 drives the gear a8, the gear a8 drives the gear d18 to rotate, and the gear d18 drives the gear c15 to rotate through the electromagnetic clutch b17 , the gear c15 drives the gear b14 to rotate, and the gear b14 drives the wire disc 16 to move, so that the wire 12 moves in the opposite direction; the power transmission route in this state is shown in Figure 6;

Step S5, the detection mechanism sends the rotational speed w signal of the wire disc 16 to the input module of the ECU 21, the input module transmits the rotational speed w signal to the calculation module, and the calculation module of the ECU 21 calculates the displacement stroke s ₂ of the wire; when s ₂ =s', the ECU21 output module sends a signal to the electromagnetic relay a5, the electromagnetic relay d20 and the electromagnetic clutch b17, the electromagnetic relay a5, the electromagnetic relay d20 and the electromagnetic clutch b17 are disconnected respectively to release the parking state.

In the present invention, a motor 7, a gear, a wire disc 16 and other mechanisms are installed on the rear frame of the RV, and the wire 12 is wound with the wire disc 16. When the driver parks on a slope, when the front car is braked by pulling the handbrake, the electronic control unit ECU21 controls the electromagnetic relay b6, the electromagnetic relay c19 is combined with the electromagnetic clutch a10, and the rear vehicle power supply 4 supplies power to the motor 7 to make the gear a8 rotate. , thereby driving the wire disc 16 to rotate and the wire 12 to move, and finally the brake shoe 11 is combined with the wheel hub to realize the parking of the rear car. After the parking is completed, the one-way locking device 9 locks the wire disc 16 to prevent it from slipping backward. At the same time, the electromagnetic relay b6 and the electromagnetic relay c19 are turned off. When the parking state is released, the driver releases the handbrake, the electronic control unit ECU21 controls the electromagnetic clutch a10 to disconnect, the electromagnetic relay a5 and the electromagnetic relay d20 are combined with the electromagnetic clutch b17, and the rear vehicle power supply 4 controls the motor 7 to reverse, and finally the brake The moving shoe 11 is released from the contact state with the hub to realize the release of the parking state. The device improves the convenience and safety for the driver of the trailer-type RV to park on the ramp.

The series of detailed descriptions listed above are only specific descriptions for the feasible embodiments of the present invention, and they are not intended to limit the protection scope of the present invention. Changes should all be included within the protection scope of the present invention.

Claims (10)

1. A ramp parking device for a trailer type motor home is characterized by comprising a detection mechanism, an execution mechanism and an ECU (21);

the actuating mechanism comprises a motor (7), a gear a (8), a gear b (14), a gear c (15), a gear d (18), a one-way locking device (9), an electromagnetic clutch a (10), an electromagnetic clutch b (17), an electromagnetic relay a (5), an electromagnetic relay b (6), an electromagnetic relay c (19), an electromagnetic relay d (20), a steel wire (12) and a brake shoe (11); the motor (7) transmits power to the steel wire disc (16) through the electromagnetic clutch a (10) to drive the steel wire disc (16) to rotate in the forward and reverse directions; the one-way locking device (9) is fixedly arranged on a rotating shaft between the motor (7) and the electromagnetic clutch a (10), and the one-way locking device (9) prevents the electromagnetic clutch a (10) from driving the steel wire disc (16) to rotate reversely; the gear a (8) is fixedly arranged on a rotating shaft between the motor (7) and the one-way locking device (9), and the gear b (14) is fixedly arranged on the rotating shaft connected with the steel wire disc (16) and positioned behind the steel wire disc (16); gear d (18) meshes with gear a (8), and gear d (18) transmits power to gear c (15) through electromagnetic clutch b (17), gear c (15) meshes with gear b (14); the steel wire disc (16) is wound with a steel wire (12), and the steel wire (12) is connected with the brake shoe (11);

the detection mechanism detects the weight M of the rear vehicle, the angle y of the ramp, the position of the hand brake and the rotating speed w of the steel wire disc (16), and sends detected signals to the ECU (21);

the ECU (21) comprises an input module, a calculation module and an output module; the output module is respectively and electrically connected with the motor (7), the electromagnetic relay a (5), the electromagnetic relay b (6), the electromagnetic relay c (19), the electromagnetic relay d (20), the electromagnetic clutch a (10) and the electromagnetic clutch b (17); the input module is used for receiving a position signal of a hand brake, the weight M of a rear vehicle, the angle y of a ramp and the rotating speed w of a steel wire disc (16) detected by the detection mechanism and transmitting the position signal to the calculation module, the calculation module calculates the parking force F required by the rear vehicle and the displacement stroke s 'of a steel wire required to be pulled according to the received signal, compares the displacement stroke s' of the steel wire required to be pulled with the displacement s of the steel wire which has moved, and the output module sends information to respectively control the combination or disconnection of the electromagnetic relay a (5), the electromagnetic relay b (6), the electromagnetic relay c (19), the electromagnetic relay d (20), the electromagnetic clutch a (10) and the electromagnetic clutch b (17) and the forward and reverse rotation of the motor (7) according to the comparison result.

2. The hill-hold device for a trailer-type motor home according to claim 1, wherein the detection mechanism comprises a load sensor (1), a level (2), a handbrake switch sensor (3), and a rotation speed sensor (13);

the load sensor (1) is used for detecting the weight M of the rear vehicle; the level gauge (2) is used for detecting the angle y of the ramp; the hand brake switch sensor (3) is used for detecting the position of a hand brake; the rotating speed sensor (13) is used for detecting the rotating speed w of the steel wire disc (16); the load sensor (1), the level meter (2), the hand brake switch sensor (3) and the rotating speed sensor (13) are respectively connected with an input module of the ECU (21).

3. The hill-hold device for a trailer-type motor home according to claim 1, wherein the one-way locking device (9) comprises a locking outer wall (902), a locking rib (903), a return spring (904), a stopper (905), a locking steel plate (906) and a locking shaft (907);

the locking outer wall (902) is circular, the locking shaft (907) is located in the locking outer wall (902), a plurality of locking rib plates (903) are installed on the circumference of the locking shaft (907), a plurality of locking steel plates (906) are installed on the inner side of the locking outer wall (902), and one side of each locking steel plate (906) is hinged to the locking outer wall (902); the locking shaft (907) drives the locking rib plate (903) to move in the forward direction, and the locking rib plate (903) extrudes the locking steel plate (906); one end of the return spring (904) is fixedly arranged on the inner side of the locking outer wall (902), and the other end of the return spring abuts against the lower surface of the locking steel plate (906); one side of the limiting block (905) is installed on the inner side of the locking outer wall (902), the locking shaft (907) moves anticlockwise, the locking rib plate (903) drives the locking steel plate (906) to move towards the limiting block (905), and the other side of the limiting block (905) blocks the other side of the locking steel plate (906) to move reversely.

4. The hill-hold device for a trailer-type motor home according to claim 3, wherein the number of the locking rib (903) and the locking steel plate (906) is four.

5. Hill-holding device for a pull-type motor home according to claim 1, characterized in that the motor (7) is fixed to the rear vehicle frame.

6. The hill-hold device for a trailer-type motor home as claimed in claim 1, wherein the rotation shaft is combined with an inner race of a bearing, and an outer race of the bearing is welded to a rear frame.

7. A control method of the hill-hold device for a trailer type motor home according to claim 1, characterized by comprising a parking step;

the parking step specifically comprises the following steps:

step S1, the detection mechanism transmits the detected hand brake signal, the rear vehicle weight M and the angle y of the ramp to an input module of an ECU (21), the input module transmits the received signal to a calculation module, the calculation module judges the braking force F required by parking and the actual displacement stroke S' required for pulling the steel wire;

s2, an output module of the ECU (21) sends signals to an electromagnetic relay b (6), an electromagnetic relay c (19) and an electromagnetic clutch a (10), the electromagnetic relay b (6), the electromagnetic relay c (19) and the electromagnetic clutch a (10) are respectively combined, a rear vehicle power supply (4) supplies power to a motor (7), the motor (7) drives a gear a (8) to rotate in the forward direction, the gear a (8) drives a steel wire disc (16) to rotate through the electromagnetic clutch a (10), and the steel wire disc (16) pulls a steel wire (12);

step S3, the ECU (21) input module receives the rotating speed w signal of the steel wire disc (16) detected by the detection mechanism and transmits the rotating speed w signal to the calculation module, and the calculation module calculates the displacement S of the steel wire (12)₁When s is₁When the parking brake is equal to s', an output module of the ECU (21) sends signals to the electromagnetic relay b (6) and the electromagnetic relay c (19), the electromagnetic relay b (6) and the electromagnetic relay c (19) are respectively disconnected, the electromagnetic clutch a (10) is kept connected, the one-way locking device (9) prevents the electromagnetic clutch a (10) from reversely rotating, so that the steel wire disc (16) is locked, the steel wire (12) is prevented from pulling the steel wire disc (16), and the parking brake is realized.

8. The control method of the hill-hold device for a pull-type motor home according to claim 7, further comprising the step of releasing the parking state;

the step of releasing the parking state specifically comprises the following steps:

when the input module of the ECU (21) detects whether the handbrake signal input by the detection mechanism is changed or not in step S4, the output module sends signals to an electromagnetic relay a (5), an electromagnetic relay d (20) and an electromagnetic clutch b (17), the electromagnetic relay a (5), the electromagnetic relay d (20) and the electromagnetic clutch b (17) are respectively combined and send signals to the electromagnetic clutch a (10), the electromagnetic clutch a (10) is disconnected, a rear vehicle power supply (4) controls a motor (7) to rotate reversely, the motor (7) drives a gear a (8), the gear a (8) drives a gear d (18) to rotate, the gear d (18) drives a gear c (15) to rotate through the electromagnetic clutch b (17), the gear c (15) drives a gear b (14) to rotate, and the gear b (14) drives a steel wire disc (16) to move so that a steel wire (12) moves reversely;

step S5, the detection mechanism sends a rotating speed w signal of the steel wire disc (16) to an input module of the ECU (21), the input module sends the rotating speed w signal to a calculation module, and the calculation module calculates the displacement stroke S of the steel wire₂(ii) a When s is₂When s', the ECU (21) outputs the module to the outsideThe magnetic relay a (5), the electromagnetic relay d (20) and the electromagnetic clutch b (17) send signals, and the electromagnetic relay a (5), the electromagnetic relay d (20) and the electromagnetic clutch b (17) are respectively disconnected to release the parking state.

9. The control method of the hill-hold device for a pull-type motor home according to claim 7, characterized in that the braking force F required for parking is calculated by the formula:

F＝M·g·siny

wherein M is the rear vehicle load, y is the angle of the ramp, and g is the gravitational acceleration.

10. The control method of the hill-hold device for a pull-type motor home according to claim 9, wherein the calculation formula of the actual displacement stroke s' of the pull wire is:

s′＝s″+e

wherein e is the limit error of the one-way locking device (9), e is 1/4 pi d, d is the diameter of the inner ring of the steel wire disc (16);

s' is the displacement required by the calculation module according to the braking force F; therefore, the temperature of the molten metal is controlled,

s′＝s″+1/4·π·d。

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