MXPA01001010A - Electronic system for monitoring a fifth wheel hitch - Google Patents

Abstract

An electronic system monitors a trailer hitch assembly (20) that has a hitch plate (26) with a throat (60) for receiving a kingpin (70) of a trailer and a locking mechanism (28) for locking the kingpin (70) in throat (60). The system determines whether the trailer hitch assembly (20) is properly coupled to the trailer and includes a trailer sensor (32,34), a lock sensor (36), and a control circuit (100). The trailer sensor (32,34) senses the position of the trailer relative to the trailer hitch assembly (20) and the lock sensor (36) senses the position of the locking mechanism (28). The control circuit (100) is coupled to the trailer sensor (32,34) and the lock sensor (36), and determines whether the trailer hitch assembly (20) is properly coupled to the trailer by taking into account the sequence in which the trailer sensor (32,34) and the lock sensor (36) sense the respective positions of the trailerand the locking mechanism (28), as well as, the time periods elapsing between the sensing at such positions.

Description

ELECTRONIC SYSTEM TO MONITOR A FIFTH WHEEL COUPLER The present invention is directed to an electronic system for monitoring the coupling of a trailer to a trailer hitch assembly that is mounted on a truck chassis and more specifically, to an electronic system that indicates whether the trailer is properly coupled to the trailer assembly. trailer hitch.

An electronic coupling control system for a vehicle trailer hitch assembly is described in U.S. Patent No. 5,861,802, entitled "Fifth Wheel Hitch Coupling Control System" issued to Hungerink et al. U.S. Patent No. 5,861,802 has been assigned to the assignee of the present invention. U.S. Patent No. 5,861,802 discloses an electronic coupling control system that includes a trailer proximity sensor to sense when a trailer is in close proximity to the hitch assembly, a master bolt sensor to sense the presence of a trailer master bolt in a throat of the trailer plate and a closure sensor to sense when the closure mechanism is closed in a secured position.

U.S. Patent No. 5,861,802 also discloses an indicator located within the vehicle to provide information on the engagement status of the trailer hitch assembly to a vehicle driver. A control circuit is coupled to the proximity sensor of the trailer, to the master bolt sensor, to the closed sensor and to the indicator. These sensors are used by the control circuit to inform a driver when a trailer is in close proximity to the trailer hitch assembly, when the trailer master bolt is placed in the hitch throat and when the lock mechanism is in a closed position. The electronic coupling control system also includes an interface and for coupling a control input, from an electric vehicle control system, to the electronic coupling control system. The electronic coupling control system is also capable of performing several self-diagnostic routines to ensure proper operation of the system, when the ignition of the vehicle is activated.

Even though U.S. Patent No. 5,861,802 advantageously provides some information to an operator of a vehicle, an electronic control coupling system is desirable that will safely provide additional information to a vehicle operator, while the vehicle is coupled to a trailer during normal operation.

Synthesis of the invention An embodiment of the present invention is directed to an electronic system for monitoring a trailer hitch assembly. The trailer hitch assembly has a hitch plate with a throat for receiving a master bolt for a trailer and a locking mechanism for fixing the master bolt in the throat. The system determines whether the trailer hitch assembly is properly coupled to the trailer and includes a tow sensor, a lock sensor and a control circuit. The trailer sensor senses the position of the trailer in relation to the trailer hitch assembly. The closing sensor senses the position of the lock mechanism. The control circuit is coupled to the tow sensor and the closing sensor. The control circuit determines whether the trailer hitch assembly is properly coupled to the trailer by taking into account the sequence in which the trailer sensor and the closing sensor perceive the respective positions of the trailer and the closing mechanism, as well as the , the periods of time that elapsed between the perception of such positions.

In one embodiment, the tow sensor is a master pin sensor that perceives the position of the master pin relative to the throat. In another incorporation, the tow sensor is an inclination sensor that perceives the inclination of the coupling plate. In still yet another embodiment, the tow sensor includes a master bolt sensor which senses the position of the master bolt in relation to the throat and the inclination sensor which senses the inclination of the latching plate d. In still yet another embodiment, a display device d is coupled to the control circuit to provide information of the coupling state to the vehicle driver. The coupling status information includes an error code that indicates the possible sources of a malfunction of the coupling.

These and other features, advantages and objects of the present invention will be understood and appreciated later by those with a skill in the art by reference to the following description, claims and appended drawings.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings: Figure 1A is a drawing of the truck trailer including an electronic system for monitoring a trailer hitch assembly, in accordance with an embodiment of the present invention; Figure IB is a bottom view of the trailer hitch assembly of Figure LA; Figure 1C is a side view of the trailer hitch assembly of Figure 1A; Figure ID is a side and partial view of the cross section of the trailer hitch assembly shown in Figure IB; Figure 1E is an isometric view of an output device for providing information of the coupling state to a driver of the trailer of the truck of Figure 1A; Figure 1F is a diagram of an electronic system for monitoring the trailer hitch assembly of Figure 1A, in accordance with an embodiment of the present invention; Figures 2A-2G are a flow chart of a routine for determining and displaying coupling status information to a driver of the tractor trailer of Figure IA, in accordance with an embodiment of the present invention; and Figures 3A-3J are other flow charts of a routine for determining and displaying information of the coupling status of a truck trailer of Figure IA, in accordance with another embodiment of the present invention.

Detailed description of the preferred additions The present invention is directed to an electronic system that monitors a trailer hitch assembly including a hitch plate with a throat for receiving a master bolt of a trailer and a locking mechanism for securing the master bolt to the throat. A system control circuit determines whether the trailer hitch assembly is properly coupled to the trailer by monitoring a trailer sensor and a closing sensor. The trailer sensor senses the position of the trailer in relation to the trailer hitch assembly. The closing sensor senses the position of the closing mechanism. The control circuit determines whether the trailer hitch assembly is properly coupled to the trailer by taking into account the sequence in which the trailer sensor and the closed sensor sensed the respective positions of the trailer and the closing mechanism, as well as the , the periods of time that elapsed between the perception of such positions.

Figure IA shows a truck trailer 10 which includes a trailer hitch assembly 20 having a base liner 24 secured to a chassis 80, a trailer hitch plate 26 pivotally mounted on a base 2 on a transverse axle and a locking mechanism 28 for securing or conventional trailer master bolt in place. The electronic system of the present invention preferably includes tre mounting proximity sensors to the hitch assembly 20 and or output device 50 mounted in the cab of the trailer 10. These sensors are coupled to the output device 5 by a multiple lead cable 45. In a preferred embodiment, the three sensors mounted on the trailer hitch assembly 20 include an inclination sensor 32, a master bolt sensor 34 and a fixation sensor 36.

Figures IB-ID provide a more detailed view of a trailer hitch assembly 20 of FIG. DLA. In a preferred embodiment, the inclination sensor 32 is mounted on a flange 23 of the latch plate 26 so that the sensor end faces outwardly in a direction perpendicular to the pivot bolts 21. FIG. 1C shows the hook 26 on the side in combination with the base 21 e in a coupled horizontal position 25 and in an uncoupled position in the rest position 27 (dotted lines). By mounting a metal plate 85 in a body 80 in a close position where the sensing end of the inclination sensor 32 is positioned when the towing hook plate 26 is in the rest position, the inclination sensor 32 detects the presence of the plate 85 as a basis for determining that the hook plate is inclined or that it is in a rest position. When the tractor 10 retracts under a trailer, contact is made between the inclined hitch plate 26 and a part of the trailer.

This contact causes the latch plate 26 to rotate in a coupled (horizontal) position. When the inclination sensor 32 subsequently detects the absence of the plate 85, it can be concluded that the latch plate 26 has been moved from its rest position and that the trailer is in proximity to the latch assembly. Alternatively, the sensor 32 may be mounted in this manner to thereby detect the metal when the hook plate 26 is in the horizontal coupled position.

Figure IB shows a master bolt sensor 34 mounted on the latch plate 26 with a sensor end near the throat 60 formed in the latch plate 26, in which the master trailer bolt 70 is positioned and fixed. Figure ID provides an inverted side view and the partial cross section illustrates the location of the trailer master pin 70 when properly positioned in the throat 60. As constructed, the master pin sensor 34 outputs a detection signal when the flange lower of the metal trailer master bolt is placed in the groove 60, below a closing plane 61.

That is, the master pin sensor 34 is in a plane below the closing mechanism 28 and only detects the master pin 70 when one. Master pin rib 70 extends below the closing plane 61. The location of the master pin sensor 34 prevents it from indicating that the master pin 70 is present when a large coupling occurs, which prevents the locking mechanism 28 from securing to the master bolt 70 (e.g., the trailer) to the hitch plate assembly 20. The fastening mechanism 28, of the hitch plate assembly 20, is urged by a compression spring to automatically secure and secure the trailer's master bolt. 70, as soon as it enters the hooking throat 60. Figure IB shows the fixing sensor 36 mounted on the hook plate 26 so that a perception end is in a position close to a position of that of a cam plate. of metal 29 (of closing mechanism 28) when in the fixed position. In this form, the fixing sensor 36 detects the presence of the cam plate 29 as a base for detecting whether the lock mechanism is in a secured and fixed position.

Those of ordinary skill in the art will appreciate that the present invention can be used in connection with any type of fixing mechanism. It should also be noted that the present invention can be applied to the sets of "trailer hitch that has other constructions and that is not limited to the particular mounting locations shown for sensors 32, 34 and 36.

Figure 1E illustrates an output device d example 50. The multiple lead cable 45 couples the sensors 32, 34 and 36 to the output device 50. The internal components (eg, control circuits) of the output device 50 they are also shown in Figure 1F. The output device 50 includes a display panel 51 for providing information on the coupling status to a handler of a tractor 10. In a preferred embodiment, the display bread 51 includes a "not closed" icon 52, a closed icon. '55, a' fifth-wheel 'icon 53 and a seven-segment display 56. In that embodiment, the display 56 provides an error code indicating possible sources of malfunctioning of the coupling.

Preferably, a red light emitting diode (LED) is provided behind the 'unclosed' icon 52 (eg, an indicator without closing red). Also, yellow, red and green light emitting diodes are provided behind the 'fifth wheel' icon 53 (for example, a yellow, red and green fifth wheel indicated) and a green lu emitting diode provided behind the icon 'closed' 55 (for example, and green fixation indicator). One with ordinary skill in art will appreciate that the individual light emitting diodes. <; 11 can be replaced with an array of light-emitting diodes capable of providing multiple colors. Even when the output device 50, as shown, only includes visual indicators, one with skill in the art will readily appreciate that an audio output can be provided. For example, by adding a loudspeaker and the appropriate voice processing circuits, the output device 50 can provide a voice output to instruct a driver regarding the possible causes of malfunction of the coupling. Additionally, a warning bell can be activated additionally, or as an alternative to providing an uncluttered icon 52.

Figure 1F describes a block diagram of an electronic system 100, in accordance with an embodiment of the present invention. The electronic system 100 includes a processor 102 that receives input from the sensors 32, 34 and 36.

The processor 102 is also coupled to a memory 104 and an output device 106. In a preferred embodiment, the processor 102 is a PIC16C62, manufactured by Microchip Technology Inc. of Chandler, Arizona. A plurality of processors 102 are coupled through resistors that limit the current 122, 124, 126 and 130 to the light emitting diodes 112, 114, 116, 118 and 120, respectively. The processor 102 runs a routine which, depending on the input of the sensors 32, 34 and 36, can cause an error code to appear in the output device 106 and cause different combinations of light emitting diodes 112 to 120 to light up. .

The memory 104 includes a uniquely programmable and electronically erasable read-only memory application amount (EEPROM) that allows the processor 102 to store a history of changes in the position of a trailer and of a closing mechanism, as it is perceived respectively by means of a tow sensor and a fixation sensor. For example, sequences of change in the state of a sensor can be stored in a first-in, first-out (FIFO) way. Such information is useful in determining if an accidental uncoupling has occurred due to an accidental uncoupling due to an unexpected mechanical error or due to a driver carelessly neglecting the above error codes. This information can also be useful when training truck drivers in the proper coupling. In a preferred embodiment, the memory 104 is a 24C08, manufactured by Microchip Technology Inc., and can be remotely coupled to the processor 102 so that the stored information of the sensor therein can be easily retrieved by coupling to a computer system. external computer. Depending on the application, the inclination sensor 32 may not be implemented. In a preferred embodiment, the output device 106 is a seven-segment display. In a normal operation, a positive voltage is applied to the terminal 101 which allows the light emitting diodes 112 to 120 to emit light, as dictated by the processor 102.

Figures 2A-2G are a flow chart of a routine 200, running on a processor 102, which determines whether the trailer hitch assembly is properly coupled to the trailer. This is achieved, in part, by taking into account the sequence in which the master pin sensor and the fixation sensor sensed the respective positions of a tow master and a fixing mechanism, as well as, of a period of time that elapsed between the feeling of such positions. Table 1, provided below, in view of the error codes and information to solve what corresponds to routine 200, of figures 2A to 2G. The routine 200 is started when the vehicle is turned on (step 202). Because the control circuit 100 of the printed circuit board (PCB) receives power from the ignition of the vehicle, when the vehicle n is operating, the power is not provided to the printed circuit board. Therefore, whenever the vehicle is running, the energy will be applied to the printed circuit board (step 210). Then, in step 212, a variable d "intent", which tracks the number of times a coupling has been attempted without success, is set equal to zero. From step 212, the control is transferred to step 214 where a prime timekeeper ('timekeeper') is placed equal to zero and the variable of 'intent' is incremented by one. Then, the control is transferred to step 216 when the first timed is turned on.

TABLE 1 determines if the master pin is not present and if the lock is open. If the master pin sensor indicates that the master pin is not present. and the lock sensor indicates that the lock is open, the control is transferred to step 224. ' In another way, the control is transferred to step 232 (see Fig. 2B).

In step 224, the processor 102 determines whether the first timer is greater than 1.024 seconds. If not, the control is transferred to step 226 where the active processing 102 (if it is not already active) the yellow fifth wheel indicator. The yellow indicator warns the driver that the hook is ready to be engaged. If the first timer is greater than 1.024 seconds, the control is transferred to step 22 where the processor 102 deactivates the yellow fifth wheel indicator. This sequence of time ensures that the indicated yellow is not illuminated for any extended period, such as when the driver is driving any appreciable distance without the trailer. From steps 226 and 228, the control returns to step 220. Therefore, while the master pin is not present and the lock is open, the control continually jumps from step 220 to step 224 to step 226 (or step 228) and back to step 220, when the vehicle is running. When this condition is no longer true, the contro is transferred from step 220 to step 232.

In step 232 (Figure 2B), the processor 10 determines whether the master pin is present and whether the lock is open. If this is the case, the control is transferred from step 232 to step 234. Otherwise, the control s transfers to step 316 (Figure 2G). In step 234, the prime timekeeper is set to zero. Then, in step 236, the voice processor 102 turns on the first timekeeper. Then, in step 238, the processor 102 determines whether the master pin is still present and if the lock is open. If this is the case, the control is transferred from step 238 to step 242. Otherwise, the control is transferred from step 23 to step 246. In step 242, the active processor 102 (s is not already activated ) the yellow fifth wheel indicator. Then, in step 244, the processor 102 determines whether the prime timekeeper is greater than one second. If this is the case, the contro is transferred to step 280 (Figure 2E). Otherwise control returns to step 238.

In step 246, the processor 102 determines whether the master pin is present and whether the lock is closed. ^ S this is so, the control is transferred to step 260 (figure 2D). Otherwise, the control is transferred from step 246 to step 284 (FIG. 2E) by processing error. In the pas 280 (FIG. 2E), the processor 102 provides an appropriate error code '(e.g.' 7 ') and activates the red fifth wheel indicator and the red closed non-closed indicator. The error code '7' indicates that a very long period of time elapsed between the master bolt being present and the lock of the lock (for example, more than one second). Then, in the country 282, the processor 102 determines whether the master pin is no longer present and the lock is open. While this condition n is true, control passes through step 282 and pass 280. When the condition is true, the control is transferred from step 282 to step 214.

In step 284 (Figure 2E), the processor and 10 determine whether the variable "try" is equal to one. That is, more than one unsuccessful attempt has been made to couple the tract to the trailer. If the variable "attempt" is equal to one, the control is transferred from step 284 to step 290. Otherwise, control is transferred from step 284 to step 286. In step 286, processor 102 provides an appropriate error code (for example, '6') and activates the closed red indicator n and the red fifth wheel indicator. An error code of '6' indicates that a second master pin attempt n appeared before the lock was closed. Then, in the country 288, the processor 102 determines if there is not a master pin present and if the lock is closed. Then, in step 288 the processor "102 determines if there is no master pin present and if the lock is open, if this is so, the control s transfers to step 214 (figure 2A). Otherwise, return step by step 286 In step 290, the processor 102 provides an appropriate error code (e.g. '0') and activates the red non-closed indicator and can activate the red fifth wheel indicator. An error code of '0' can indicate any error that occurred during a first coupling attempt. At that point, the control is transferred to step 292 where the processor 102 determines if a master pin is not present and if the lock is open. If this is the case, the control is transferred to step 214. Otherwise, the control returns to step 290.

Step 260 (Figure 2D) is executed following a determination that the master pin is present and that the lock is closed (step 246 in Figure 2B). In step 260, the processor 102 executes the routine 200, determines if the master pin is still present and if the lock is still closed. If this is the case, the control is transferred to step 262 where the processor 102 determines whether the prime timekeeper is greater than sixty seconds. If the prime timekeeper is not more than sixty seconds, the control is transferred to step 266 where the processor 102 activates (if not already activated) the green fifth wheel indicator and the green lock indicator to indicate that the proper coupling has been achieved. Then, in step 268, the variable "intent" is set to zero and the process goes through steps 260 to 268 until the timekeeper exceeds 60 seconds or changes the state of the master bolt or lock. If the first timer exceeds sixty seconds, in step 262, the control is transferred to step 270 where the processor 102 turns off the green fifth wheel indicator and the green lock indicator d. At that point, the control is transferred to the pass 260. If either the master pin is not present or if the lock is not closed in step 260, the control is transferred to step 272. Otherwise, the process continuously passes. through steps 260, 262 and 270.

In step 272, the processor 102 determines if the master pin is not present and if the lock is closed. If this is the case, the control is transferred from step 272 to step 274. Otherwise, the control is transferred from the country 272 to step 294 (Figure 2F). In step 294 (FIG. 2F), the processor 102 provides an appropriate error code (eg, '9') and activates the red open indicator and the red fifth wheel indicator. An error code of '9' indicates that the master pern is present, but the lock is open. This may suggest either that the driver is intentionally uncoupling the trailer or that the locking mechanism has failed. At that point, the control is transferred to step 296 where the processor determines if there is no master pin present and if the lock is open. If this is the case, the control is transferred to step 214. Otherwise, the control returns to step 294.

In step 274 (figure 2D), a second iv timekeeper is initialized to zero. Then, the control is transferred to step 275 where the processor 102 turns on the second timekeeper. Then, in step 276, the processing 102 determines whether the second timer is greater than five seconds. If this is the case, the control is transferred from the country 276 to step 298 (FIG. 2F) to indicate that a non-coupling may have occurred. Otherwise, the control is transferred from step 276 to step 278 in which the processor 102 determines whether the lock is open. If this is so, the processor 102 determines whether or not the lock mechanism has failed that the driver is intentionally uncoupling the trailer, and therefore control is transferred to step 302 (Figure 2F). Otherwise, the processor 102 determines that the master pin sensor only momentarily missed the master pin, such as the cassette when it is driven over a pothole in the road, etc., and therefore the control is transferred. from step 278 to pass 306 (Figure 2G).

In step 298 (Fig. 2F), the processor 102 provides an appropriate error code (e.g., '8') activates the red fifth wheel indicator. The error code d '8' indicates that the lock is closed, but that the pern master is not present. At that point, the control is transferred to step 300 where the processor 102 determines if there is no master pin present and if the lock is open. If this is the case, the control is transferred to step 214. Otherwise, the control returns to step 298.

In step 302 (Fig. 2F), the processor 10 provides an appropriate error code (e.g., '9') activates the red open indicator and the red fifth red indicator. An error code of '9' indicates that the lock is open. At this point, the control is transferred to step 304 e where the processor 102 determines if the master pern is not present and if the lock is open. If this is the case, the control is transferred to step 214. Otherwise, the control returns to step 302.

In step 306 (FIG. 2G), the processor 10 determines whether the first timekeeper exceeds seventy seconds. If not, the control is transferred from step 306 to step 31 where the processor 102 activates (if not already activated) the green fifth wheel indicator and the green lock indicator. If the first timekeeper has exceeded the setent seconds, the control is transferred to step 308 where the processor 102 deactivates the green fifth wheel indicator and green lock indicator. From steps 312 and 308, the control is transferred to step 314 where the processing 10 determines whether the master pin is present and whether the lock is closed. If this is the case, the control is transferred to the country 260 (figure 2D). Otherwise, the control is transferred to step 276.

Referring again to Figure 2C, in Step 248, the processor 102 determines whether the master pin is present and the lock is closed. This step follows after the determination that the master bolt is present and / or the lock is closed after the vehicle ignition in step 218 (Figure 2A). If the master bolt is present and the lock is closed, the processor 102 determines that the truck was switched on with the trailer already properly engaged and the control is transferred from step 248 to step 266 to indicate the proper coupling. Otherwise, the control s transfers from step 248 to step 250 in which the processor 102 determines if a master pin is not present and the lock is closed. If this is the case, the control goes to step 252. Otherwise, the processor 102 determines that the release of the lock could have been pulled while the truck was stopped, and the control goes to step 259. In the 259th, the processor 102 provides an appropriate error code (e.g. '2') and activates the red open indicator and the red fifth wheel indicator. An error code of '2' indicated that while the master pin is present the lock is open. Then, in step 261, the processor 102 determines whether a master pin is present and whether the lock is open. If this is the case, the control is transferred to step 214. Otherwise, the control transfer returns to step 259.

In step 252, the processor 102 provides an appropriate error code (e.g., '1') and activates the red fifth wheel indicator, at this point, the control is transferred to step 256 where the processor 102 determines if a master pin is not present and if the lock is open. If this is the case, the control is transferred to step 214. Otherwise, the control returns to step 252.

In step 316 (Fig. 2G), the processor 102 determines whether a variable "try" is equal to one. That is, if more than one unsuccessful attempt has been made to attach the tractor to the trailer. If the variable "try" is equal to one, the control is transferred from step 316 to step 322. Otherwise, the control is transferred from step 316 to step 318. In step 318, the processor 102 provides an appropriate error code (eg, '5') and activates the red fifth wheel indicator. An error code of '5' indicates that in a second attempt the lock was closed before the master bolt was present. Then, in step 320, the processor 102 determines whether a master pin is not present and whether the lock is open. If this is the case, the control is transferred to step 214. Otherwise, the control returns to step 318.

In step 322, the processor 102 provides an appropriate error code (e.g., '0') and activates the remove red wheel indicator and may activate the red open indicator. An error code can indicate any error that occurred during a first coupling attempt. At that point, the control is transferred to step 324 where the processor 102 determines if a master pin is not present and if the lock is opened. If this is the case, the control is transferred to step 214. Otherwise, the control is transferred from step 324 to step 322.

Therefore, the routine 200 as described above, takes into account the sequence in which the master bolt sensor and the lock sensor sensed the respective positions of a trailer master bolt and a closing mechanism, as well as a period of time that elapsed between perceiving such positions.

Figures 3A to 3J are a flow chart of a routine 400, running on the processor 102, to determine the potential cause of improper coupling by taking into account the sequence in which the tilt sensor, j a sensor Master bolt and a closing sensor sensed the respective positions of the trailer hitch plate, the trailer master bolt and the closing mechanism. In a preferred embodiment, the processor 102 determines which routine 200 or 400 is to be executed by determining whether a routine selection splice cable (not shown) is present in the circuit control of the printed circuit board.

Additionally, the period time that elapsed between the perception of the master bolt and the closing of the mechanism, the lock is tracked. Table 2, provided below, lists the error code and the solution information of the problem corresponding to the routine 400 of Figures 3A to 3J. As in routine 200, routine 400 runs in a processor 102, while the vehicle is running. A primary difference between routines 400 and 200 is the consideration of the sensor information provided by the inclination sensor 32. When the vehicle is not running, power is removed from the control circuit of the printed circuit board.

TABLE 2 In step 410, when the power is applied to the printed circuit board, a boot routine is run by the processor 102. At that point, the routine 400 is executed and the control is transferred to the step 412 where the processor 102 , which runs routine 400, initializes a "try" variable at zero. As stated before, the variable "intent" is used to track the number of coupling attempts that have occurred, so that an appropriate error code can be displayed to the driver. Then, in step 414, the processor 102 initiates a prime time zero and increases, by one, the variable "intent". Then, the processor 102 turns on the first timekeeper in step 416. Then, in step 418, the processor 102 determines whether the inclination is low, if the master pin is not present and the lock is open. As indicated above, the processor 102 determines these conditions by reading the outputs provided by the sensors 32, 34 and 36. If the condition is true, the control is transferred from step 418 to step 420. Otherwise, the control is transferred from step 418 to step 454 (Figure 3C).

In step 420, the processor 102 determines whether the inclination is low, if a master pin is not present and if the lock is open. If this is the case, the control is transferred from step 420 to step 426. In step 426, the processor 102 determines whether the first timekeeper is greater than 1024 seconds. If not, in step 424, the processor 102 active (if not already activated) the yellow fifth wheel indicator. The yellow indicator warns the driver that the hitch is ready for the coupling. Otherwise, the control is transferred to step 428 where the processor 102 deactivates the yellow fifth wheel indicator. This sequence of time ensures that the yellow indicator is not limited by any extended period, such as when the driver is driving for any appreciable distance without the trailer.

From steps 424 and 428, the control is transferred to step 420.

While the indication is low, the master pin is not present and the lock is open, the jump from step 420 to step 426 to either step 424 or step 428 and back to step 420 continues, while the vehicle is working. When the condition of the sensors changes so that this condition is no longer satisfied, the control is transferred from step 420 to step 432 (Figure B).

In step 432, the processor 102 determines whether the inclination is level, if the master pin is not present and the lock is open. If this is the case, the control is transferred from step 432 to step 434. Otherwise, the control is transferred from step 432 to step 566 (Figure 3J). In step 434, the processor 102 determines whether the inclination is level, if the master bolt is not present and if the lock is open. If not, the control is transferred to step 440. If the condition is true, the control is transferred from step 434 to step 438 where the processor 102 activates (if not already activated) the yellow fifth wheel indicator . From step 438, the control returns to step 434. In step 440, the processor 102 determines whether the inclination is level, whether the master pin is present and whether the lock is open. If this is the case, the control is transferred from step 440 to step 442. Otherwise, the control is transferred from step 440 to step 514 Co. figure 3F).

In step 442, the processor 102 initializes the first timekeeper. Then, in step 444, the processor 102 turns on the first timekeeper. Then, in step 446 the processor determines if the inclination is level, if the master pin is present and if the lock is open. If this is the case, the control is transferred from step 446 to step 450. Otherwise, the control is transferred from step 446 to step 486 (FIG. 3E). In step 450 the processor 102 activates the yellow fifth wheel indicator, at this point the control is transferred to step 452. In step 452, the processor 102 determines whether the first timekeeper is greater than one second. If this is the case, the control is transferred from step 452 to step 510. Otherwise control is transferred from step 452 to step 446.

In step 510 (FIG. 3F), the processor 102 provides an appropriate error code (e.g., '8') and activates the red open indicator and the red fifth wheel indicator. Error code of '8' indicates that while the tilt is level and the master pin is present, the lock did not close within a second. From step 510, the control is transferred to step 512. In step 512, the processor determines whether the inclination is low, the master pin is not present and the lock is open. If this is the case, the control is transferred from step 512 to step 414. Otherwise, the control returns to step 510.

In step 514, the processor 102 determines whether the variable "attempt" is equal to one. That is, if more than one unsuccessful attempt has occurred in the coupling. If the attempt is a first attempt, the control is transferred from step 514 to step 520. Otherwise, the control is transferred from step 514 to step 516. In step 516, processor 102 provides a code of appropriate error (for example, from '4') activates the red fifth wheel indicator. An error code of '4' indicates in a second attempt the lock closed before the master pin is present. Then, in step 518, the processor 102 determines if the inclination is low, the master pin is not present and if the lock is open. If this is the case, the control is transferred from step 518 to step 414. Otherwise, the control returns to step 516.

In step 520, processor 102 provides an appropriate error code (e.g., from '0') and activates the red fifth wheel indicator and can activate the red open indicator. The error code of '0' can indicate any error that occurred during a first coupling attempt. Then, the control is transferred to step 522 e where the processor 102 determines whether the inclination is low, n the master pin is present and if the lock is open. If this is the case, the control is transferred from step 522 to step 414. Otherwise, the control is transferred from step 522 to step 520.

In step 454 (Figure 3C), the processor 102 determines if the inclination is level, if the master pin is present and if the lock is closed. If this is the case, the control is transferred from step 454 to step 494 (Figure 3E). Otherwise, the control is transferred from step 454 to step 456. In step 456, the processor 102 determines whether the tilt is level, if the master pin is present and if the lock is open. If this is the case, the control is transferred from step 456 to step 463. Otherwise, the control is transferred from step 406 to step 458. In step 458, processor 102 determines whether the inclination is level , if there is no master pin and the lock is closed. If so, the control is transferred from step 458 to step 460. Otherwise the transfer control from step 458 to step 464 (figure 3D).

In step 460, the processor 102 provides an appropriate error code (e.g., '2') and activates the red fifth wheel indicator and may activate the red open indicator. An error code of '2' indicates that while the tilt is level and the lock is closed, the pin.) Master is not present. Then, the control is transferred to step i 462 where the processor 102 determines if the tilt is down, the master pin is not present and the lock is open. If so, the control is transferred from step 462 to step 414. Otherwise, the control is transferred to step 460, In step 463, the processor 102 provides an appropriate error code (e.g., '1') and activates the red fifth wheel indicator and can activate the red open indicator. Then, in step 465, the processor 102 determines whether the tilt is down, if the master pin is not present and if the lock is open. If this is the case, the control transfers from step 465 to step 414. Otherwise, the control returns to step 463.

In step 464, the processor 102 determines whether the inclination is level, the master pin is present in the lock is open. If this is the case, the control is transferred from step 464 to step 482. Otherwise, the control is transferred from step 464 to step 466. In step; í ". 466, the processor 102 determines if the inclination is low, if the master pin is not present and if the lock is • r. closed. If this is the case, the control is transferred to step 478. Otherwise the control is transferred to step 468 where the processor 102 determines whether the inclination is low, the master pin is present and the lock is closed. If this is the case, the control is transferred from step 468 to step 474. Otherwise, the control is transferred from step 468 to step 470. In step 470, the processor 102 provides an appropriate error code (eg example, from '2') and activates the red fifth wheel indicator and can activate the one indicated to open red. Then, in step 470, the processor 102 determines, if the inclination is low, if the master pin is not present and if the lock is open. If this is the case, the control is transferred to step 414. Otherwise, the control returns to step 470.

In step 474, the processor 102 provides an appropriate error code (eg, '1') and activates the red fifth wheel indicator and can activate the red open indicator. From step 474, the control is transferred to step 476 where the processor 102 determines whether the inclination is low, if the master bolt is not present and if the lock is open. If this is the case, the control is transferred from step 476 to step 414. Otherwise, the control is transferred from step 476 to step 474.

In step 478, the processor 102 also provides an appropriate error code (eg, '3') activates the red fifth wheel indicator and can activate the red open indicator. Then, in step 480, the processing 102 determines if the inclination is low, if the master pin is not present and if the lock is opened. If this is the case, the control is transferred from step 480 to step 414. Otherwise, the control returns to step 478. In the same way, in step 482, processor 102 provides an appropriate error code (e.g. , of '3') and activates the red fifth wheel indicator and can activate the red open indicator. Then, in step 484, the processor 102 determines whether the tilt is down, if the master pin is in and the lock is open. If this is the case, the control is transferred from step 484 to step 414. Otherwise, the control returns to step 482.

In step 486 (Figure 3E), the processor 102 determines whether the inclination is level, whether the master bolt is present and whether the lock is closed. If this is the case, the control is transferred from step 486 to step 488. Otherwise, the control is transferred to step 550 (FIG. 31). In step 488, the processor 102 determines if the inclination is still level, if the master pin is still present and if the lock is still closed. If this is the case, control is transferred from step 488 to step 490. Otherwise, the control is transferred to step 500. In step 490, the processor 102 determines whether the first timekeeper is greater than sixty seconds. If this is the case, the control is transferred to step 498. Otherwise, the control is transferred from step 490 to step 494. In step 494, the processor 102 activates the green lock indicator and the fifth wheel indicator green to indicate that a suitable coupling has been achieved, at which point the control is transferred to step 496. In step 496, processor 102 initializes the variable "attempt" to zero and the process jumps through steps 488 to 496 until the timekeeper exceeds sixty seconds or changes the state of the tilt, the master bolt or the closed state. In step 498, after the timekeeper exceeds sixty seconds, the processor 102 turns off the green closed indicator and-, the > - • »- green fifth wheel indicator, at this point the control is transferred to step 488.

In step 500, the processor 102 determines whether the lock is open. If this is the case, the control is transferred to step 524 (Figure 3G). Otherwise, the control is transferred to step 502. In step 502, processor 102 initializes a second timekeeper initializes to zero. Then, in step 504, the processor 102 initializes a second timekeeper. Then, in step 506, the processor 102 determines whether the second timekeeper is greater than five seconds. If so, the control is transferred to step 508. Otherwise, the control is transferred to step 532 (FIG. 3H). In step 508, the processor 102 determines whether the master pin is not present. If this is the case, the control is transferred to step 528. Otherwise, the control is transferred from step 508 to step 532.

In step 528, the processor 102 provides an appropriate error code, (e.g., '7') and activates the red fifth wheel indicator and can activate the red open indicator. Then, in step 530, the processor 102 determines if the inclination is low, if the master pin is not present d * and if the lock is open. If this is the case, the control is transferred from step 530 to step 414. Otherwise, the control is transferred to step 528. In step 524, processor 102 also provides appropriate error code (eg, from ' 9 ') and activates the red open indicator and the red fifth wheel indicator. From that point, the control s transfers to step 526 where the processor 102 determines if the inclination is low, if the master bolt is not present and the lock is open. If this is the case, the control s transfers from step 526 to step 414. Otherwise, the control returns to step 524.

In step 532, the processor 102 determines whether the lock is open. If this is the case, the control is transferred from step 532 to step 534. Otherwise, the control is transferred to step 538. In step 534, the processor 102 provides an appropriate error code (e.g. 3 ') activates the red fifth wheel indicator and can activate and open red indicator. Then, in step 536, the processing 102 determines whether the inclination is low, if the master bolt is not present and if the lock is open. If this is the case, the control is transferred to step 414. Otherwise, the control returns to step 534.

In step 538, the processor 102 determines whether, the first timekeeper is greater than sixty seconds. If the prime timekeeper is not greater than sixty seconds, the control s transfers to step 546 where the processor 102 activates the green closed indicator and the green fifth wheel indicator. Otherwise, the control is transferred to step 540 where the processor 102 turns off the green closed indicator and the green fifth wheel indicator. Then, in step 548, if the processor 102 determines if the inclination is level, the master pin is present and the lock is closed. If this is the case, the control is transferred to step 488. Otherwise, the control is transferred to step 506.

In step 550, the processor 102 determines whether the coupling attempt is a first coupling attempt. If so, the control is transferred from step 550 to step 562. Otherwise, the control is transferred to step 552. In step 552, the processor 102 determines if the master pin is not present. If this is the case, the control is transferred to step > 558. If this is not the case, the control is transferred to step 554 where processor 102 provides an appropriate error code (for example, from '6') and activates the red fifth wheel iator and can activate the red open iator. An error code of '6' iates that the coupling plate is not level. Then, the control is transferred to step 556 where the processor 102 determines whether the inclination is low, if there is no master bolt if the lock is open. If this is the case, the control is transferred to step 414. Otherwise, the control returns to step 554.

In step 558, processor 102 provides an appropriate error code (e.g., '7') and activates the red fifth wheel iator and may activate the red open iator. An error code of '7' iates that the master pin is not present. Then, in step 560 the processor 102 determines if the inclination is low, if the master bolt is not present and if the lock is open. If this is the case, the control is transferred to step 414. Otherwise, the control returns to step 558.

In step 562, the processor 102 provides the appropriate error code (e.g., '0') and activates the red fifth wheel iator and can activate the red open iator. Then, in step 564, the processor 102 determines if the inclination is low, if the master pin is not present and if the lock is open. If this is the case, the control is transferred to step 414. Otherwise the control is transferred from step 564 to step 562.

In step 566, the processor 102 determines whether the attempt to dock on a first coupling attempt. If this is the case, the control is transferred from step 566 to step 578. Otherwise, the control is transferred from step 566 to step 568. In step 568, the processor 102 determines whether the lock is closed. If this is the case, the control is transferred from step 568 to step 574. Otherwise, the control is transferred from step 568 to step 570 .. In steps 578, 574 and 570, processor 102 provides a appropriate error code (for example, '0', '4' and '.5', respectively) and activates the red fifth wheel iator can activate the red open iator.

From step 578, the control is transferred to step 580. In step 580, the processor 102 determines whether the inclination is low, if the master pin is not present and if the lock was open. If this is the case, the control is transferred to step 414. Otherwise, the control returns to step 578. From step 574, the control is transferred to step 576. In step 576, the processor 102 determines whether the inclination It is low, if not present the master bolt and if the lock is open. If this is the case, the control is transferred to step 414. Otherwise, the control returns to step 574. From step 570, the control is transferred to the country 572. In step 572, the processing 102 determines whether the inclination is down, there is no master bolt and the lock is open. If this is the case, the control is transferred to step 414. Otherwise, the control returns to step 570. As iated above, the routine 400 runs continuously while the energy e is provided to the control circuit of the printed circuit board.

Therefore, a control circuit and two routine have been described which determine whether the trailer hitch assembly is properly coupled to the trailer by taking into account the sequence in which the trailer sensor and the closed sensor perceive the positions of the trailer and the closing mechanism, as well as the periods of time that elapsed between the perception of such positions.

Claims (30)

R E I V I N D I C A C I O N S

1. An electronic system for monitoring a trailer hitch assembly having a hitch plate with a throat for receiving a master bolt of a trailer and its closing mechanism for fixing the master bolt in the throat, said system determines whether the hitch trailer is properly coupled to the trailer, said system comprises: a tow sensor for sensing the position of the trailer in relation to said tow hitch assembly; a closing sensor to perceive the position of closing mechanism; a control circuit coupled to the tow sensor and said closing sensor, said control circuit determines whether the trailer hitch assembly is properly coupled to the trailer by taking into account the sequence in which the tow sensor and said tow sensor closing they perceive the respective positions of the trailer and closing mechanism as well as the period of time that elapses between the perception of such positions.

2. The system as claimed in clause 1 characterized in that the tow sensor is a master bolt sensor that perceives the position of the master bolt in relation to said throat.

3. The system as claimed in clause 1 characterized in that the tow sensor is an inclination sensor that perceives the inclination of a hook plate.

4. The system as claimed in clause 1 characterized in that the tow sensor includes a master bolt sensor that senses the position of the master bolt in relation to said throat and an inclination sensor that perceives the inclination of the latch plate.

5. The system as claimed in clause 1 characterized in that it also includes a display device coupled to the control circuit, said display device exhibits the coupling status information to the vehicle handler.

6. The system as claimed in clause 5, characterized in that the coupling status information includes an error code indicating the possible sources of malfunction of the coupler.

7. The system as claimed in clause 5 further characterized because it includes: a memory device for storing the coupling status information, said coupling status information includes a history of the changes in the position of the trailer and of the locking mechanism as perceived respectively by the tow sensor and the closing sensor.

8. An electronic system for monitoring a trailer hitch assembly mounted on a vehicle, the trailer hitch assembly has a hitch plate with a throat for receiving a trailer hitch pin and a fixing mechanism for fixing the hitch pin in the throat, said system comprises: a tow sensor to sense the position of the trailer in relation to the trailer hitch assembly; a closing sensor to perceive the position of the closing mechanism; an output device for providing coupling status information to a vehicle driver; a control circuit coupled to said tow sensor, said closing sensor and said output device, said control circuit provides an error code through the output device when said tow sensor and said closing sensor indicate that the assembly of trailer hitch are not properly coupled to the trailer.

9. The system as claimed in clause 8 characterized in that said control circuit > determines a potential cause of improper coupling by taking into account the sequence in which the tow sensor and said closing sensor perceive the respective positions of the trailer and the closing mechanism as well as the period of time that elapses between the perception of such positions.

10. The system as claimed in clause 8 characterized in that the output device includes a plurality of light emitting diodes (LEDs) and a display of .11 seven segments.

11. The system as claimed in clause 8 characterized in that the tow sensor is a master bolt sensor that perceives the position of the master bolt in relation to said throat.

12. The system as claimed in the clause 8 characterized in that the tow sensor is an inclination sensor that perceives the inclination of the plate, d hooking.

13. The system as claimed in clause 8, characterized in that the tow sensor includes a master bolt sensor that perceives the position of the master bolt in relation to the throat and an inclination sensor that perceives the inclination of the latch plate.

14. An electronic system for monitoring a trailer hitch assembly mounted on a vehicle, the trailer hitch assembly has a hitch plate with a throat for receiving a master bolt from a trailer and its attachment mechanism for fixing the master bolt to the throat , said system comprises: a tow sensor for sensing the position of the trailer in relation to said tow hitch assembly; a closing sensor to perceive the position of fixing mechanism; a memory device for storing the coupling state information; a control circuit coupled to said towing sensor, said closing sensor, and said memory device for storing in sequence in said memory device, a history of changes in the position of the trailer and of the closing mechanism as perceived respectively said tow sensor and said closing sensor.

15. The system as claimed in clause 14 characterized in that said memory device is an EEPROM.

16. The system as claimed in clause 14 characterized in that the tow sensor is a master pin sensor which senses the position of the master bolt in relation to said throat.

17. The system as claimed in clause 14 characterized in that the sensor is a tilt sensor that perceives the inclination of the hook plate.

18. The system as claimed in clause 14 characterized in that the tow sensor includes a master bolt sensor which senses the position of the master bolt in relation to said throat and a tilting sensor which perceives the inclination of the latch plate.

19. The system as claimed in clause 14 characterized in that it also includes: a display device coupled to the control circuit, said display device exhibits coupling status information to a vehicle handler.

20. The system as claimed in clause 19, characterized in that the coupling status information includes an error code indicating the possible sources of malfunction of the coupling.

21. An electronic system for monitoring the trailer hitch assembly having a latch plate with a throat for receiving a master bolt of a trailer, a fastening mechanism for fixing the master bolt in the throat, said system determines whether the latch trailer is properly coupled to the trailer, said system comprises: a tow sensor for sensing the position of the trailer in relation to said trailer coupling assembly; a closing sensor to perceive the position of fixing mechanism; a control circuit coupled to said tow sensor and said closing sensor, said control circuit determines whether the trailer coupling assembly is suitably coupled to the trailer by taking into account the period of time elapsed between when said towing sensor and said closing sensor perceive the respective positions of the trailer and of the closing mechanism.

22. The system as claimed in clause 21 characterized in that the master pin sensor is in a plane below the fixing mechanism.

23. A coupling system comprising: a trailer hitch assembly having a hitch plate with a throat for receiving a master bolt of a trailer and a fixing mechanism for fixing the hitch pin to the throat; a tow sensor to perceive the position of the trailer in relation to the trailer hitch assembly; a closing sensor to perceive the position of closing mechanism; a control circuit coupled to said tow sensor and said closing sensor, said control circuit determines whether the tow hitch assembly is suitably coupled to the trailer by taking into consideration the sequence in which said tow sensor and said sensor The closing positions perceive the respective positions of the trailer and the closing mechanism as well as the period of time that elapses between the perception of such positions.

24. The system as claimed in clause 23 characterized in that the tow sensor is a master bolt sensor that perceives the position of the master bolt in relation to said throat.

25. The system as claimed in clause 23 characterized in that the tow sensor is an inclination sensor that perceives the inclination of the hook plate.

26. The system as claimed in clause 23 characterized in that the tow sensor includes a master bolt sensor that senses the position of the master bolt in relation to said throat and an inclination sensor that perceives the inclination of the latch plate.

27. The system as claimed in clause 23 further characterized because it includes: a display device coupled to the control circuit, said display device exhibits the coupling state information to the vehicle handler.

28. The system as claimed in clause 23 characterized in that the information of the coupling state includes an error code indicating the possible sources of malfunction of the coupling.

29. The system as claimed in clause 27, characterized in that it also includes: a memory device for storing the coupling status information, said coupling status information includes a history of changes in the position of the trailer and the closing mechanism as sensed respectively by said tow sensor and said closing sensor.

30. The system as claimed in clause 29 characterized in that the memory device includes a FIFO buffer to store the history of the changes in position of the trailer and of the closing mechanism as respectively perceived by said tow sensor and said sensor. closing. SUMMARIZES An electronic system monitors a trailer hitch assembly having a hitch plate with a throat for receiving a master bolt of a trailer and a fixing mechanism for fixing the master bolt in the throat. The system determines if the trailer hitch assembly is properly coupled to the trailer and includes a tow sensor, a lock sensor and a control circuit. The trailer sensor senses the position of the trailer in relation to the trailer hitch assembly, and the closure sensor senses the position of the locking mechanism. The control circuit is coupled to the tow sensor and the closing sensor. The control circuit determines whether the trailer hitch assembly is properly coupled to the trailer by taking into account the sequence in which the trailer sensor and the closure sensor perceive the respective positions of the fixing mechanism and the trailer, as well as the periods of time that pass between the perception of such positions.