CN108297852B - Ramp parking device for pull type motor home and control method thereof - Google Patents

Ramp parking device for pull type motor home and control method thereof Download PDF

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Publication number
CN108297852B
CN108297852B CN201810004688.9A CN201810004688A CN108297852B CN 108297852 B CN108297852 B CN 108297852B CN 201810004688 A CN201810004688 A CN 201810004688A CN 108297852 B CN108297852 B CN 108297852B
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steel wire
locking
electromagnetic relay
gear
electromagnetic clutch
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CN108297852A (en
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徐兴
汤赵
王峰
马世典
陶涛
孙广地
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Jiangsu University
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Jiangsu University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/746—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive and mechanical transmission of the braking action
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
    • B60T2201/06—Hill holder; Start aid systems on inclined road
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2250/00—Monitoring, detecting, estimating vehicle conditions
    • B60T2250/02—Vehicle mass

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)

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

Ramp parking device for pull type motor home and control method thereof
Technical Field
The invention belongs to the field of parking technology research, and particularly relates to a ramp parking device for a pull type motor home and a control method thereof.
Background
Parking is commonly used on ordinary automobiles as a basic performance requirement of the automobiles. If the vehicle is parked unstably, there is a risk of back slip, which in some cases can cause traffic congestion and accidents. The parking mode of the common automobile is that a hand brake is pulled to drive a steel wire, so that a brake shoe is contacted with a hub to realize parking. However, the structure of the pull type caravan is that the front car is connected with the carriage through a hook and an electric wire, so the parking mode of the pull type caravan is generally that a driver pulls a hand brake to park the front car, and then the driver gets off the car to add some obstacles to the rear car to make the rear car immovable, so that the parking is realized. By adopting the parking mode, when a driver parks on a larger slope, the driver steps on the brake by himself and needs to get off the vehicle to add barriers to the rear vehicle wheels to prevent the whole vehicle from sliding backwards, and the driver can not complete parking by himself, so that potential safety hazards exist in the parking mode. The parking of the existing pulling type motor home is that a parking supporting leg is added below a frame as the patent application number is 201621075601.X, and a driver pulls a pull rod to support the supporting leg on the ground so as to stabilize the motor home. The parking mode still needs a person to get off to pull the pull rod, and when a driver gets off, the driver still has the danger of backward slipping, so that the problem of parking with a large gradient cannot be solved. The patent application No. 200980136272.1 discloses that the air pressure is used to park the car by designing the valve, and the parking mode is complicated in structure and high in cost. The invention utilizes the motor to provide power to pull the steel wire through the information transmission between the front vehicle and the rear vehicle, has simple structure and lower cost, is convenient for a driver to park and simultaneously improves the parking safety.
Disclosure of Invention
The invention aims to provide a hill-hold device for a trailer type caravan and a control method thereof. The parking safety can be guaranteed when the driver parks the vehicle conveniently, and the situation that the motor home is dangerous like backward slipping or diving when the motor home parks on a slope with a larger gradient can be guaranteed. The technical scheme of the invention is that when the trailer type caravan is parked on the ramp, the braking force required by parking is judged according to the Newton's law of mechanics and the self weight and the located gradient of the rear car, and the rear car is controlled to pull the steel wire while the front car pulls the hand brake, so that the braking force of the front car and the rear car is equal to the required braking force, and the safe synchronous parking is realized.
The technical scheme of the invention is as follows: a ramp parking device for a pull type motor home comprises a detection mechanism, an execution mechanism and an ECU;
the actuating mechanism comprises a motor, a gear a, a gear b, a gear c, a gear d, a one-way locking device, an electromagnetic clutch a, an electromagnetic clutch b, an electromagnetic relay a, an electromagnetic relay b, an electromagnetic relay c, an electromagnetic relay d, a steel wire and a brake shoe; the motor transmits power to the steel wire disc through the electromagnetic clutch a to drive the steel wire disc to rotate in the forward and reverse directions; the one-way locking device is fixedly arranged on a rotating shaft between the motor and the electromagnetic clutch a and prevents the electromagnetic clutch a from driving the steel wire disc to rotate reversely; the gear a is fixedly arranged on a rotating shaft between the one-way locking device and the electromagnetic clutch a, and the gear b is fixedly arranged on the rotating shaft connected with the steel wire disc and positioned behind the steel wire disc; the gear d is meshed with the gear a, power is transmitted to the gear c through the electromagnetic clutch b by the gear d, and the gear c is meshed with the gear b; the steel wire disc is wound with steel wires, and the steel wires are connected with the brake shoes;
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 and sends detected signals to the ECU;
the ECU comprises an input module, a calculation module and an output module; the output module is respectively electrically connected with 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; 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 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 'required for pulling the steel wire according to the received signal, compares the displacement stroke s' required for pulling the steel wire 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, the electromagnetic relay b, the electromagnetic relay c, the electromagnetic relay d, the electromagnetic clutch a and the electromagnetic clutch b and the positive and negative rotation of the motor according to the comparison result.
In the above scheme, the detection mechanism comprises a load sensor, a level gauge, a hand brake switch sensor and a rotation speed sensor;
the load sensor is used for detecting the weight M of the rear vehicle; the level gauge is used for detecting the angle y of the ramp; the hand brake switch sensor is used for detecting the position of a hand brake; the rotating speed sensor is used for detecting the rotating speed w of the steel wire disc; and the load sensor, the level gauge, the hand brake switch sensor and the rotating speed sensor are respectively connected with an input module of the ECU.
In the scheme, the one-way locking device comprises a hinge, a locking outer wall, a locking rib plate, a return spring, a limiting block, a locking steel plate and a locking shaft;
the locking outer wall is circular, the locking shaft is positioned in the locking outer wall, a plurality of locking rib plates are arranged on the circumference of the locking shaft, a plurality of locking steel plates are arranged on the inner side of the locking outer wall, and one side of each locking steel plate is hinged with the locking outer wall; the locking shaft drives the locking rib plates to move in the forward direction, and the locking rib plates extrude the locking steel plates; one end of the return spring is fixedly arranged on the inner side of the locking outer wall, and the other end of the return spring abuts against the lower surface of the locking steel plate; the inboard at the locking outer wall is installed to one side of stopper, locking axle counter-clockwise movement, and the locking floor drives the locking steel sheet and moves to the stopper, and the opposite side reverse motion of locking steel sheet is blockked to the opposite side of stopper.
In the scheme, the number of the locking rib plates and the number of the locking steel plates are four.
In the scheme, the motor is fixed on the frame of the rear vehicle;
in the scheme, the rotating shaft is combined with the inner ring of the bearing, and the outer ring of the bearing is welded on a rear vehicle frame.
A control method according to the hill hold device for a pull-type motor home includes 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 the ECU, 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' of the steel wire required to be pulled;
step S2, an output module of the ECU sends signals to an electromagnetic relay b, an electromagnetic relay c and an electromagnetic clutch a, the electromagnetic relay b, the electromagnetic relay c and the electromagnetic clutch a are respectively combined, a power source of a rear vehicle supplies power to a motor, the motor drives a gear a to rotate in the forward direction, the gear a drives a steel wire disc to rotate through the electromagnetic clutch a, and the steel wire disc pulls a steel wire;
step S3, the ECU input module receives the rotating speed w signal of the steel wire disc 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 wire1When s is1When the signal is s', the output module of the ECU sends signals to the electromagnetic relay b and the electromagnetic relay c, the electromagnetic relay b and the electromagnetic relay c are respectively disconnected, the electromagnetic clutch a is kept connected, and the one-way lock is realizedThe stopping device prevents the electromagnetic clutch a from reversely rotating, so that the steel wire disc is locked, the steel wire disc is prevented from being pulled by a steel wire, and parking is realized.
In the above aspect, the method further includes the step of releasing the parking state;
the step of releasing the parking state specifically comprises the following steps:
step S4, when an input module of the ECU detects that a hand brake signal input by the detection mechanism is changed, an output module sends signals to an electromagnetic relay a, an electromagnetic relay d and an electromagnetic clutch b, the electromagnetic relay a, the electromagnetic relay d and the electromagnetic clutch b are respectively combined and send signals to the electromagnetic clutch a, the electromagnetic clutch a is disconnected, a power supply of a rear vehicle controls the motor to rotate reversely, the motor drives a gear a, the gear a drives the gear d to rotate, the gear d drives a gear c to rotate through the electromagnetic clutch b, the gear c drives the gear b to rotate, and the gear b drives a steel wire disc to move so that a steel wire moves reversely;
step S5, the detection mechanism sends a rotating speed w signal of the steel wire disc to an input module of the ECU, 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 the parking state is not satisfied, the ECU output module sends signals 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 are respectively turned off to release the parking state.
In the above scheme, the formula for calculating the braking force F required for parking is as follows:
F＝M·g·siny
wherein M is the rear vehicle load, y is the angle of the ramp, and g is the gravitational acceleration.
In the above scheme, the calculation formula of the actual displacement stroke s' of the pulling steel wire is as follows:
s′＝s″+e
wherein e is the limit error of the one-way locking device, e is 1/4 pi d, d is the diameter of the inner ring of the steel wire disc;
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。
compared with the prior art, the invention has the beneficial effects that:
1. compared with the situation that a driver needs to get off to control the rear vehicle to park, the device can realize the simultaneous parking of the front vehicle and the rear vehicle by pulling the hand brake by the driver, and improves the parking convenience of the driver.
2. Compared with a parking mode that barriers are added on the wheels of the rear car to prevent the motor home from slipping backwards, the device adopts an active control mode, the ECU judges the required parking force and controls the motor to rotate and pull the steel wire, so that the braking force meets the required parking force, and the parking safety is improved.
3. The device adopts a method of pulling the steel wire to park by mechanical motion, thereby improving the parking stability.
4. The device has a simple structure and is convenient to install and maintain.
5. Compared with the method of directly drawing the displacement of the steel wire to the maximum, the invention can flexibly control the parking force, reduce the pressure on the steel wire and the brake shoe and better protect the parking device.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the locking device;
FIG. 3 is a schematic diagram of an electronic control system according to the present invention;
FIG. 4 is a parking work flow diagram;
FIG. 5 is a power transmission diagram in a parking state;
fig. 6 is a power transmission diagram for releasing the parking state.
In the figure, 1, a load sensor; 2. a level gauge; 3. a hand brake switch sensor; 4. a rear vehicle power supply; 5. an electromagnetic relay a; 6. an electromagnetic relay b; 7. a motor; 8. a gear a; 9. a one-way locking device; 901. a hinge; 902. a locking outer wall; 903. A locking rib plate; 904. a return spring; 905. a limiting block; 906. locking the steel plate; 907. a lock shaft 10, an electromagnetic clutch a; 11. a brake shoe; 12. a steel wire; 13. a rotational speed sensor; 14. a gear b; 15. a gear c; 16. a wire reel; 17. An electromagnetic clutch b; 18. a gear d; 19. an electromagnetic relay c; 20. an electromagnetic relay d; 21. an ECU.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and detailed description, but the scope of the present invention is not limited thereto.
Fig. 1 shows an embodiment of the hill-hold device for a trailer type motor home according to the present invention, which comprises a detection mechanism, an actuator, and an electronic control unit ECU 21.
The detection mechanism comprises a load sensor 1, a level gauge 2, a hand brake switch sensor 3 and a rotating speed sensor 13; the load sensor 1 is used for detecting the weight M of a rear vehicle; the level 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 wire disc 16; the load sensor 1, the level gauge 2, the hand brake switch sensor 3 and the rotation speed sensor 13 are respectively connected with an ECU 21. The detection mechanism signals the detected 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 to the ECU 21.
The actuating mechanism comprises 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 relay c19, an electromagnetic relay d20, a steel wire 12 and a brake shoe 11. The rear vehicle power supply 4 is used for supplying power to the motor 7. The motor 7 is fixed on the frame of the rear vehicle, positive and negative rotation can be realized by exchanging the positive and negative poles of the power supply, and the motor 7 transmits power to the steel wire disc 16 through the electromagnetic clutch a10 to drive the steel wire disc 16 to rotate in the positive and negative directions. 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 arranged on a 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 steel wire disc 16 to reversely rotate; the gear a8 is fixedly arranged on a rotating shaft between the one-way locking device 9 and the electromagnetic clutch a10, and the gear b14 is fixedly arranged on the rotating shaft connected with the steel wire disc 16 and is positioned behind the steel wire disc 16; gear d18 meshes with gear a8, and gear d18 transmits power to gear c15 through electromagnetic clutch b17, and gear c15 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 brake shoe 11 is used for combining with a wheel 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 disc 16 when parking is completed. The one-way locking device 9 comprises a hinge 901, a locking outer wall 902, a locking rib 903, a return spring 904, a limiting block 905, a locking steel plate 906 and a locking shaft 907.
Fixing a locking outer wall 902 on a frame, wherein the locking outer wall 902 is circular, a locking shaft 907 is positioned in the locking outer wall 902, four locking rib plates 903 are arranged on the circumference of the locking shaft 907, four locking steel plates 906 are arranged on the inner side of the locking outer wall 902, and one side of each locking steel plate 906 is hinged with 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.
When the gear a8 rotates in the forward direction, the locking shaft 907 carries the locking rib 903 to move clockwise, the locking rib 903 presses the locking steel plate 906, and the locking steel plate 906 presses the spring to move downward. When the locking rib 903 is disengaged from the locking plate 906, the locking plate 906 returns to the original position by the return spring 904. When locking axle 907 anticlockwise motion, locking floor 903 can drive locking steel sheet 906 to the stopper 905 motion, when locking steel sheet 906 combines with stopper 905, locking axle 907 just can be deadly and unable motion to make the axis of rotation of being connected rather than driving the reverse rotation of wire reel 16 through electromagnetic clutch a10, thereby with the locking of wire reel 16.
Because a gap exists between the locking rib plates 903, a certain locking error e exists, after the forward rotation of the locking shaft 907 is finished, the steel wire 12 pulls the steel wire disc 16 to rotate in the reverse direction, the locking shaft 907 of the one-way locking device 9 is driven to rotate in the reverse direction, and therefore the locking rib plates 903 are driven to rotate. The locking rib plate 903 further drives the locking steel plate 906 to move so that the locking steel plate is combined with the limiting block 905, and finally the locking 907 shaft is locked. Therefore, the clearance between the locking ribs 903 determines the magnitude of the locking error e. The larger the number of the locking ribs 903, the smaller the locking error, but the more difficult and costly the manufacturing process. The smaller the number of the locking ribs 903, the larger the locking error. The preferred number of locking ribs 903 is four. The locking error is smaller, and the manufacturing difficulty and the manufacturing cost cannot be 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 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 respectively; the input module is used for receiving signals of 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 detected by the detection mechanism and transmitting the signals to the calculation module, and the calculation module calculates the parking force F required by the rear vehicle and the displacement stroke s' required for pulling the steel wire according to the received signals.
The braking force F required by parking can be expressed by the following formula:
F＝M·g·siny
the calculation module calculates the required displacement s "from the braking force F. Because the one-way locking device 9 has a certain limit error e, wherein d is the diameter of the inner ring of the steel wire coil, the calculation formula of the actual displacement stroke s' of the pulled steel wire is as follows:
s′＝s″+e，
wherein e is 1/4 pi d
Thus, s' ═ s "+ 1/4 · pi · d
The displacement s can be calculated using the following formula:
s＝π·d∫wdt，
wherein t is time and d is the diameter of the inner ring of the wire disc 16; w is the rotational speed of the wire disc 16;
meanwhile, the calculation module needs to compare the calculated actual displacement stroke s ' of the pulled steel wire with the displacement s of the steel wire which has moved, and when s ' is larger than s, the control device continues to work, and when s ' is equal to s, the device stops working. The output module sends information to control the connection or disconnection of 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 and the forward and reverse rotation of the motor 7 respectively.
As shown in fig. 4, the control method of the hill-hold device for a pull-type motor home includes a parking step and a step of releasing a parking state.
The parking step specifically includes the following processes:
s1, detecting the position of a hand brake by a hand brake switch sensor 3 of the detection mechanism, detecting the weight M of a rear vehicle by a load sensor 1, detecting the angle y of a ramp by a level gauge 2, transmitting a detected hand brake signal, the weight M of the rear vehicle and the angle y of the ramp to an input module of an ECU21 by the detection mechanism, transmitting a received signal to a calculation module by the input module, judging the braking force F required by parking according to the weight M of the rear vehicle and the angle y of the ramp by the calculation module, and judging the actual displacement stroke S' of pulling a steel wire;
step S2, an output module of the ECU21 sends signals to an electromagnetic relay b6, an electromagnetic relay c19 and an electromagnetic clutch a10, the electromagnetic relay b6, the electromagnetic relay c19 and the electromagnetic clutch a10 are respectively combined, a rear vehicle power supply 4 supplies power to a motor 7, the motor 7 drives a gear a8 to rotate in the forward direction, the gear a8 enables the electromagnetic clutch a10 to drive a wire disc 16 to rotate through a rotating shaft and a one-way locking device 9, and the wire disc 16 pulls a wire 12; the power transmission route in the parking state is shown in fig. 5;
step S3, the ECU21 input module receives the rotating speed w of the wire disc 16 detected by the rotating speed sensor 13 of the detection mechanism and transmits the rotating speed w to the calculation module, and the calculation module calculates the displacement S of the wire 121When s is1When the output module of the ECU21 sends signals to the electromagnetic relay b6 and the electromagnetic relay c19, and the electromagnetic relay b6 and the electromagnetic relay c19 respectivelyAnd when the electromagnetic clutch a10 is disconnected, the electromagnetic clutch a10 is prevented from reversely rotating by the one-way locking device 9, 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 is realized.
The step of releasing the parking state specifically includes the following processes:
step S4, when the input module of the ECU21 detects that the manual brake signal input by the detection mechanism is changed, the 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 respectively combined 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 rotate reversely, the motor 7 drives the gear a8, the gear a8 drives the gear d18 to rotate, 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 reversely; the power transmission route in this state is shown in fig. 6;
step S5, the detection mechanism sends a rotating speed w signal of the wire disc 16 to an input module of the ECU21, the input module sends the rotating speed w signal to a calculation module, and the calculation module of the ECU21 calculates the displacement stroke S of the wire2(ii) a When s is2When the vehicle is in s', the ECU21 output module transmits 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 are turned off to release the parking state.
The invention is that the motor 7, the gear, the steel wire disk 16 and other mechanisms are arranged on the rear frame of the caravan, and the steel wire 12 is wound with the steel wire disk 16. When a driver parks on a slope, the driver brakes a front vehicle by pulling a hand brake, 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 enable the gear a8 to rotate, so that the steel wire disc 16 is driven to rotate and the steel wire 12 moves, and finally the brake shoe 11 is combined with the hub to park the rear vehicle. After parking is finished, the one-way locking device 9 locks the steel wire disc 16 to prevent backward slipping. At the same time, electromagnetic relay b6 and electromagnetic relay c19 are turned off. When the parking state is released, the driver looses the hand brake, the electronic control unit ECU21 controls the electromagnetic clutch a10 to be disconnected, the electromagnetic relay a5, the electromagnetic relay d20 and the electromagnetic clutch b17 are combined, the rear vehicle power supply 4 controls the motor 7 to rotate reversely, and finally the brake shoe 11 and the wheel hub are released from a contact state, so that the parking state is released. The device improves the convenience and the safety of the slope parking of the driver of the pull type caravan.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the 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。
CN201810004688.9A 2018-01-03 2018-01-03 Ramp parking device for pull type motor home and control method thereof Active CN108297852B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100410917B1 (en) * 2000-12-06 2003-12-18 기아자동차주식회사 Parking brake for a motor vehicle
DE202010013585U1 (en) * 2010-09-24 2010-11-25 Knott Gmbh Overrunning brake for motor vehicle trailer with electromechanical auxiliary device for actuating the parking brake
CN103057531A (en) * 2013-01-08 2013-04-24 伊德日斯·如孜瓦柯 Automatic braking device for manual transmission automobile
CN103323257A (en) * 2013-05-28 2013-09-25 万向钱潮股份有限公司 Static testing device of electronic parking braking system
CN106218627A (en) * 2016-08-23 2016-12-14 芜湖伯特利汽车安全系统股份有限公司 It is applied to electronic brake system and the P shelves inter-linked controlling method thereof of motor vehicles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100410917B1 (en) * 2000-12-06 2003-12-18 기아자동차주식회사 Parking brake for a motor vehicle
DE202010013585U1 (en) * 2010-09-24 2010-11-25 Knott Gmbh Overrunning brake for motor vehicle trailer with electromechanical auxiliary device for actuating the parking brake
CN103057531A (en) * 2013-01-08 2013-04-24 伊德日斯·如孜瓦柯 Automatic braking device for manual transmission automobile
CN103323257A (en) * 2013-05-28 2013-09-25 万向钱潮股份有限公司 Static testing device of electronic parking braking system
CN106218627A (en) * 2016-08-23 2016-12-14 芜湖伯特利汽车安全系统股份有限公司 It is applied to electronic brake system and the P shelves inter-linked controlling method thereof of motor vehicles

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