CA1300210C - Motor vehicle braking system - Google Patents
Motor vehicle braking systemInfo
- Publication number
- CA1300210C CA1300210C CA000512336A CA512336A CA1300210C CA 1300210 C CA1300210 C CA 1300210C CA 000512336 A CA000512336 A CA 000512336A CA 512336 A CA512336 A CA 512336A CA 1300210 C CA1300210 C CA 1300210C
- Authority
- CA
- Canada
- Prior art keywords
- vehicle
- movement
- braking system
- brake application
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 abstract 1
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- 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
- B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
- B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
- B60T1/06—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels acting otherwise than on tread, e.g. employing rim, drum, disc, or transmission or on double wheels
-
- 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
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
- B60T7/22—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle, or by means of contactless obstacle detectors mounted on the vehicle
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
MOTOR VEHICLE BRAKING SYSTEM
Inventor: William Charles Paulson ABSTRACT OF THE DISCLOSURE
A method and apparatus for automatically actuating the braking system of a vehicle, in which contact of the vehicle with an obstruction is detected as the vehicle moves backwards and a signal is generated. A sensor senses the backward movement of the vehicle and arms a system which causes brake application on detection of the signal.
Inventor: William Charles Paulson ABSTRACT OF THE DISCLOSURE
A method and apparatus for automatically actuating the braking system of a vehicle, in which contact of the vehicle with an obstruction is detected as the vehicle moves backwards and a signal is generated. A sensor senses the backward movement of the vehicle and arms a system which causes brake application on detection of the signal.
Description
2~ 0 FIELD OF THE INVENTION
This invention relates to a motor vehicle braking system providing automatic braking when the vehicle, moving in reverse, detects an obstruction.
RACKGROUND OF THE INVENTION
It is already known, particularly in connection with goods-carrying vehicles, to provide at the rear of the vehicle (which may for example be a wagon or the trailer of a tractor/
trailer combination) a detector which, when the vehicle reverses, detects an obstruction and serves to generate a signal which can be used to initiate application of the vehicle's brakes so bringing the vehicle to a standstill and minimising the risk of damage or injury to any obstruction or person behind the vehicle.
There are several types available, and at least one such known system is interrelated to a driver-controlled reverse selector on the vehicle in such a manner that the system is armed or made ready for brake application to be effected upon receiving a signal from the detector only when the vehiclels driver has selected reverse gear. Thus, with this system a signal generated by the detector causes brake application only when the vehicle's driver has deliberately operated the selector for the vehicle to be driven backwards.
There are other methods which necessitate the engaging of an electrical switch, or the operating of a camera and associated equipment, and rely on the driver to control or activate. ~one of these will operate, therefore, if for instance the vehicle should commence running backwards, e.g. down a hill when out of gear, or as a result of being impacted at the front. Thus, the prior proposed systems do not safeguard against the risk of accident in the event of unintentional reverse movement of the vehicle, which can arise in a substantial number of varied circumstances of which possible the most important one is the risk arising from inattentive parking upon an inclined surface.
~ ~o~o An object of the present invention is to provide a braking system ~hich safeguards against any reverse movement, whether intentional or unintentional, and in which the need for the operation of switched, or a reverse selector of the vehicle to have been shifted into the reverse condition, is obviated.
STATEMENT OF THE INVENTION
In its broadest aspect the invention consists of a method of automatically actuating the braking system of a vehicle, comprising-the step of sensing the rotational direction of a member which rotates in one direction in the forward direction o movement of the vehicle and in the opposite direction in the reverse direction of movement of the vehicle and arming the system, upon sensing rotation of the member in said opposite direction and, while the system is thus armed and the vehicle is moving in the reverse direction, detecting the vehicle contacting an obstruction and thereby generating a signal to cause brake application.
In another aspect the invention consists of a motor vehicle braking system comprising: detector means, positioned on the vehicle, constructed and arranged to detect the vehicle contacting an obstruction when the vehicle is moving backwards and to generate a signal on said contact; sensor means effective to sense the rotational direction of a member which rotates in one direction in the forward direction of movement of the vehicle and in the opposite direction in the reverse direction of movement of the vehicle, said sensor means serving, upon sensing .
2~l0 rotation of the member in said opposite direction, to arm the system; and means actuable by the detector signal to cause brake application.
BRIEF DESCRIPTION OF THE DRAt~lNGS
An example embodiment of the invention is shown in the accompanying drawings in which:
Figure 1 is a perspective view of the rear portion of the trailer of a tractor-trailer combination;
Figure 2 is a transverse cross-sectional view of 2~0 the rear bumper of the trailer taken along line 2-2 of Figure l;
Figure 3 is a cross-sectional view of a first embodiment associated with the wheel hub assembly of the trailer of Figure l;
Figure 4 is an explod~d perspective view of the rotation detector of the wheel hub assembly of Figure 3;
Figure 5 is a view of the magnetic activator disc of .he rotation detector of Figure 4 taken along line 5-5 of Figure 3 and showing its position in relation to the valve pin when the trailer is moving forwardly;
Figure 6 is a cross-sectional view taken along line 6-6 of Figure 5;
Figure 7 is a view similar to Figure 5 showing the position of the disc in relation to the valve pin when the trailer is moving in reverse;
Figure 8 is a cross-sectional view taken along line 8-8 of Figure 7;
Figure 9 is a schematic flow diagram of the air brake system of the device;
Figure 10 is a flow diagram similar to Figure 9 showing the brake system in operation;
Figure 11 is a cross-sectional view of a second embodiment of the invention associated with the drive shaft of a vehicle;
Figure 12 is a view taken along line 12-12 of Figure 10; and Figure 13 is a view taken along line 13-13 of Figure 11.
DESCRIPTIONOF PREFERRED EMBODIMENT
The embodiment shown in the drawings consists of a trailer 10 of a tractor-trailer combination, with a body frame 12 and including a set of réar wheels 14 compris-ing a pair of wheels 16 journally mounted for free rotation 2~
on a fixed axle 18. A fixed bumper frame 20 depends from body frame 12 and carries a rearwardly projecting pneumatic bumper tube 22 of flexible material. As seen in Figure 2?
a second pneumatic tube 24 is disposed within bumper tube 22 and extends substantially the length of the bumper tube.
The hub assembly of one wheel 16 is shown in Figure 3 and comprises a wheel hub 26 journally mounted by bearings 28 on a fixed axle 30 having an axle bore 32 closed at one end by a plug 32 which is fixed by set screws 33 to the axle and which faces a hub cap 34 mounted on boss 36 of wheel hub 26. As seen more particularly in Figure 4, a first magnet disc 38 is axially mounted for rotation on plug 32 by a pivot bolt 40 and spaced from the plug by a bushing 42 on the disc. The outer face 44 of disc 38 carries a ring 46 of fixed, spaced magnets. A stop pin 48 projects from plug 32 through a first aperture 50 in disc 38 and a spring air valve 52 projects from the plug through a second aperture 54 in disc 38 radially opposite to aperture 50 with respect to aperture 50. A second magnet disc 56 faces first magnet disc 38, being fixed to hub cap 34 on blocks 58 by bolts 60.
Disc 56 carries a ring 62 of fixed, spaced magnets which registeres with ring 46 on disc 38.
The air flow system associated with trailer 10, as shown in Figure 9 of the drawings, consists of an air brake supply line 70 passing to brake system 71 of the trailer through a normally open port 72 of a first shuttle valve 74 and an auxiliary air line 76 normally closed by shuttle valve 74. Auxiliary air supply line 76 is connected by a line 78 to a pressure reducing valve 80 and from valve 80 through a line 81 to normally closed spring air valve 52.
Line 81 is connected by a line 82 to control port 83 of a first normally closed pass control valve 84. Auxiliary air supply line 76 i9 connected through line 78 by a line 120 to pass control valve 84, thence by a line 86 to a second normally open pass control valve 88, and thence by a line 90 to connect with a line 92 impinging on one end g4 of a second shuttle valve 96 which bears at its-other end on a compression spring 98. Line 92 connects also through a normally closed third pass cor.trol valve 100 and a line 102 to impinge on one end 104 of first shuttle valve 74. Air supply line 78 connects, by a line 106 through a normally open port 108 of second shuttle valve 96, with a line 110 which impinges on the other end 112 of first shuttle valve 74. Bumper tube 24 is connected by an air line 114 to control port 116 of pass control valve 100 and to a normally open port 118 of shuttle valve 96 to air. Brake supply line 70 is connected by a line 124 to control port 126 of pass control valve 88.
In the oper~tion of the embodiment of Figures 3 to 8 the operator normally controls the brake system of trailer 10 through brake line 70. When trailer 10 is moving forward magnetic disc 56 rotates magnetic disc 38 in the direction of arrow 130 as seen in Figure 5 and pin 48 prevents valve 52 from being opened, as seen in Figure 6.
However, movement of trailer 10 in reverse, i.e. backwards, causes disc 56 to rotate disc 38 in the opposite direction as indicated by arrow 132 in Figure 7 and this movement of disc 38 opens valve 52 as seen in Figure 8~
The opening of valve 52 vents air from lines 81 and 82 which opens port 83 of valve 84 and allows pressurized air from line 120 to pass through valve 84, line 86, valve 88, line 90 and line 92 to throw shuttle valve 96, against the action of spring 98, in the direction of arrow 134 as seen in Figure 10, thus sealing the venting of line 114 and relieving the pressure on end 112 of shuttle valve 74.
Also the venting of bumper tube 24 is cut off. This brings the brake system into readiness for automatic operation by the contact of bumper tube 22 with an obstruction.
0~2:~0 When bumper tube 22 comes into contact with any obstruction an air pulse is sent from tube 24 along line 114 to valve 100 which opens port 116 and allows pressurized air from line 92 to pass through line 102 and against end 104 of shuttle valve 74, throwing valve 74 in the direction of arrow 136 as seen in Figure 10, thus closing line 70 and opening line 76 through part 138 to brake system 71.
This automatically operates brake system 71 to stop the reverse movement of trailer 10 immediately.
In order to release the brake system from the automatically actuated mode the operator of the vehicle presses the foot brake which actuates valve 88 through lines 70 and 124 to port 126. This closes valve 88, cutting off the air supply to lines 90 and 92 and relieving the pressure on end 94 of shuttle valve 96. Shuttle valve 96 is thus allowed to be thrown back by spring 98 to its normal posi-tion and allows air from line 10~ to pass through port 108 and line 110 to end 112 of shuttle valve 74 which throws that valve back to its normal position.
When the operator releases the foot brake port 126 is closed which returns the system to its armed mode.
On the resumption of forward movement of trailer 10, air valve 52 returns to its normal closed position as seen in Figure 5 and 6. This closes port 83 of valve 84, thus returning the system to its original (nDrmal) mode of operation.
In the embodiment shown in Figures 11 to 13 of the drawings the invention is activated through drive shaft 150 of a vehicle which carries a circumferential band 152 of magnets. An arcuate head 154 floats over band 152 and comprises a curved plate 156 carrying a row 158 of magnets on its concave side concentric with band 152. Head 154 is carried by a pair of support arms 160 fixed to a block 162 on the chassis of the vehicle. The free end portion 164 of each arm 160 carries lateral flanges 166 which are enclosed ~o~x~o in a bearing box 168 encasing a row of spherical bearings 170 along each crevice formed by flanges 166 which free end portion 164. Stops 172 limit the travel of plate 156.
Plate 156 is connected through a pivot pin 174 to one end of a link arm 176 which is pivotally connecting through a slot 178 at its other end to a pin 180 on block 162. Spring valve 52 projects through an aperture 182 located in arm 176 between pivot pins 174 and 180.
In the operation of the embodiment of Figures 11 to 13 the rotation of drive shaft 150 in the forward opera-tion of the vehicle causes plate 156 to move in the direction of arrow 184 by the action of the magnets of band 152 on the magnets of row 158, keeping air valve 52 centred in aperture 182. When the vehicle moves in reverse the rota-tion of drive shaft 150 in the opposite direction causes plate 156 to move in the same direction which causes link arm 176 to move opening air valve 52 and arming the system of Fipure 9 in the same manner as previously described.
This invention relates to a motor vehicle braking system providing automatic braking when the vehicle, moving in reverse, detects an obstruction.
RACKGROUND OF THE INVENTION
It is already known, particularly in connection with goods-carrying vehicles, to provide at the rear of the vehicle (which may for example be a wagon or the trailer of a tractor/
trailer combination) a detector which, when the vehicle reverses, detects an obstruction and serves to generate a signal which can be used to initiate application of the vehicle's brakes so bringing the vehicle to a standstill and minimising the risk of damage or injury to any obstruction or person behind the vehicle.
There are several types available, and at least one such known system is interrelated to a driver-controlled reverse selector on the vehicle in such a manner that the system is armed or made ready for brake application to be effected upon receiving a signal from the detector only when the vehiclels driver has selected reverse gear. Thus, with this system a signal generated by the detector causes brake application only when the vehicle's driver has deliberately operated the selector for the vehicle to be driven backwards.
There are other methods which necessitate the engaging of an electrical switch, or the operating of a camera and associated equipment, and rely on the driver to control or activate. ~one of these will operate, therefore, if for instance the vehicle should commence running backwards, e.g. down a hill when out of gear, or as a result of being impacted at the front. Thus, the prior proposed systems do not safeguard against the risk of accident in the event of unintentional reverse movement of the vehicle, which can arise in a substantial number of varied circumstances of which possible the most important one is the risk arising from inattentive parking upon an inclined surface.
~ ~o~o An object of the present invention is to provide a braking system ~hich safeguards against any reverse movement, whether intentional or unintentional, and in which the need for the operation of switched, or a reverse selector of the vehicle to have been shifted into the reverse condition, is obviated.
STATEMENT OF THE INVENTION
In its broadest aspect the invention consists of a method of automatically actuating the braking system of a vehicle, comprising-the step of sensing the rotational direction of a member which rotates in one direction in the forward direction o movement of the vehicle and in the opposite direction in the reverse direction of movement of the vehicle and arming the system, upon sensing rotation of the member in said opposite direction and, while the system is thus armed and the vehicle is moving in the reverse direction, detecting the vehicle contacting an obstruction and thereby generating a signal to cause brake application.
In another aspect the invention consists of a motor vehicle braking system comprising: detector means, positioned on the vehicle, constructed and arranged to detect the vehicle contacting an obstruction when the vehicle is moving backwards and to generate a signal on said contact; sensor means effective to sense the rotational direction of a member which rotates in one direction in the forward direction of movement of the vehicle and in the opposite direction in the reverse direction of movement of the vehicle, said sensor means serving, upon sensing .
2~l0 rotation of the member in said opposite direction, to arm the system; and means actuable by the detector signal to cause brake application.
BRIEF DESCRIPTION OF THE DRAt~lNGS
An example embodiment of the invention is shown in the accompanying drawings in which:
Figure 1 is a perspective view of the rear portion of the trailer of a tractor-trailer combination;
Figure 2 is a transverse cross-sectional view of 2~0 the rear bumper of the trailer taken along line 2-2 of Figure l;
Figure 3 is a cross-sectional view of a first embodiment associated with the wheel hub assembly of the trailer of Figure l;
Figure 4 is an explod~d perspective view of the rotation detector of the wheel hub assembly of Figure 3;
Figure 5 is a view of the magnetic activator disc of .he rotation detector of Figure 4 taken along line 5-5 of Figure 3 and showing its position in relation to the valve pin when the trailer is moving forwardly;
Figure 6 is a cross-sectional view taken along line 6-6 of Figure 5;
Figure 7 is a view similar to Figure 5 showing the position of the disc in relation to the valve pin when the trailer is moving in reverse;
Figure 8 is a cross-sectional view taken along line 8-8 of Figure 7;
Figure 9 is a schematic flow diagram of the air brake system of the device;
Figure 10 is a flow diagram similar to Figure 9 showing the brake system in operation;
Figure 11 is a cross-sectional view of a second embodiment of the invention associated with the drive shaft of a vehicle;
Figure 12 is a view taken along line 12-12 of Figure 10; and Figure 13 is a view taken along line 13-13 of Figure 11.
DESCRIPTIONOF PREFERRED EMBODIMENT
The embodiment shown in the drawings consists of a trailer 10 of a tractor-trailer combination, with a body frame 12 and including a set of réar wheels 14 compris-ing a pair of wheels 16 journally mounted for free rotation 2~
on a fixed axle 18. A fixed bumper frame 20 depends from body frame 12 and carries a rearwardly projecting pneumatic bumper tube 22 of flexible material. As seen in Figure 2?
a second pneumatic tube 24 is disposed within bumper tube 22 and extends substantially the length of the bumper tube.
The hub assembly of one wheel 16 is shown in Figure 3 and comprises a wheel hub 26 journally mounted by bearings 28 on a fixed axle 30 having an axle bore 32 closed at one end by a plug 32 which is fixed by set screws 33 to the axle and which faces a hub cap 34 mounted on boss 36 of wheel hub 26. As seen more particularly in Figure 4, a first magnet disc 38 is axially mounted for rotation on plug 32 by a pivot bolt 40 and spaced from the plug by a bushing 42 on the disc. The outer face 44 of disc 38 carries a ring 46 of fixed, spaced magnets. A stop pin 48 projects from plug 32 through a first aperture 50 in disc 38 and a spring air valve 52 projects from the plug through a second aperture 54 in disc 38 radially opposite to aperture 50 with respect to aperture 50. A second magnet disc 56 faces first magnet disc 38, being fixed to hub cap 34 on blocks 58 by bolts 60.
Disc 56 carries a ring 62 of fixed, spaced magnets which registeres with ring 46 on disc 38.
The air flow system associated with trailer 10, as shown in Figure 9 of the drawings, consists of an air brake supply line 70 passing to brake system 71 of the trailer through a normally open port 72 of a first shuttle valve 74 and an auxiliary air line 76 normally closed by shuttle valve 74. Auxiliary air supply line 76 is connected by a line 78 to a pressure reducing valve 80 and from valve 80 through a line 81 to normally closed spring air valve 52.
Line 81 is connected by a line 82 to control port 83 of a first normally closed pass control valve 84. Auxiliary air supply line 76 i9 connected through line 78 by a line 120 to pass control valve 84, thence by a line 86 to a second normally open pass control valve 88, and thence by a line 90 to connect with a line 92 impinging on one end g4 of a second shuttle valve 96 which bears at its-other end on a compression spring 98. Line 92 connects also through a normally closed third pass cor.trol valve 100 and a line 102 to impinge on one end 104 of first shuttle valve 74. Air supply line 78 connects, by a line 106 through a normally open port 108 of second shuttle valve 96, with a line 110 which impinges on the other end 112 of first shuttle valve 74. Bumper tube 24 is connected by an air line 114 to control port 116 of pass control valve 100 and to a normally open port 118 of shuttle valve 96 to air. Brake supply line 70 is connected by a line 124 to control port 126 of pass control valve 88.
In the oper~tion of the embodiment of Figures 3 to 8 the operator normally controls the brake system of trailer 10 through brake line 70. When trailer 10 is moving forward magnetic disc 56 rotates magnetic disc 38 in the direction of arrow 130 as seen in Figure 5 and pin 48 prevents valve 52 from being opened, as seen in Figure 6.
However, movement of trailer 10 in reverse, i.e. backwards, causes disc 56 to rotate disc 38 in the opposite direction as indicated by arrow 132 in Figure 7 and this movement of disc 38 opens valve 52 as seen in Figure 8~
The opening of valve 52 vents air from lines 81 and 82 which opens port 83 of valve 84 and allows pressurized air from line 120 to pass through valve 84, line 86, valve 88, line 90 and line 92 to throw shuttle valve 96, against the action of spring 98, in the direction of arrow 134 as seen in Figure 10, thus sealing the venting of line 114 and relieving the pressure on end 112 of shuttle valve 74.
Also the venting of bumper tube 24 is cut off. This brings the brake system into readiness for automatic operation by the contact of bumper tube 22 with an obstruction.
0~2:~0 When bumper tube 22 comes into contact with any obstruction an air pulse is sent from tube 24 along line 114 to valve 100 which opens port 116 and allows pressurized air from line 92 to pass through line 102 and against end 104 of shuttle valve 74, throwing valve 74 in the direction of arrow 136 as seen in Figure 10, thus closing line 70 and opening line 76 through part 138 to brake system 71.
This automatically operates brake system 71 to stop the reverse movement of trailer 10 immediately.
In order to release the brake system from the automatically actuated mode the operator of the vehicle presses the foot brake which actuates valve 88 through lines 70 and 124 to port 126. This closes valve 88, cutting off the air supply to lines 90 and 92 and relieving the pressure on end 94 of shuttle valve 96. Shuttle valve 96 is thus allowed to be thrown back by spring 98 to its normal posi-tion and allows air from line 10~ to pass through port 108 and line 110 to end 112 of shuttle valve 74 which throws that valve back to its normal position.
When the operator releases the foot brake port 126 is closed which returns the system to its armed mode.
On the resumption of forward movement of trailer 10, air valve 52 returns to its normal closed position as seen in Figure 5 and 6. This closes port 83 of valve 84, thus returning the system to its original (nDrmal) mode of operation.
In the embodiment shown in Figures 11 to 13 of the drawings the invention is activated through drive shaft 150 of a vehicle which carries a circumferential band 152 of magnets. An arcuate head 154 floats over band 152 and comprises a curved plate 156 carrying a row 158 of magnets on its concave side concentric with band 152. Head 154 is carried by a pair of support arms 160 fixed to a block 162 on the chassis of the vehicle. The free end portion 164 of each arm 160 carries lateral flanges 166 which are enclosed ~o~x~o in a bearing box 168 encasing a row of spherical bearings 170 along each crevice formed by flanges 166 which free end portion 164. Stops 172 limit the travel of plate 156.
Plate 156 is connected through a pivot pin 174 to one end of a link arm 176 which is pivotally connecting through a slot 178 at its other end to a pin 180 on block 162. Spring valve 52 projects through an aperture 182 located in arm 176 between pivot pins 174 and 180.
In the operation of the embodiment of Figures 11 to 13 the rotation of drive shaft 150 in the forward opera-tion of the vehicle causes plate 156 to move in the direction of arrow 184 by the action of the magnets of band 152 on the magnets of row 158, keeping air valve 52 centred in aperture 182. When the vehicle moves in reverse the rota-tion of drive shaft 150 in the opposite direction causes plate 156 to move in the same direction which causes link arm 176 to move opening air valve 52 and arming the system of Fipure 9 in the same manner as previously described.
Claims (10)
1. A method of automatically actuating the braking system of a vehicle, comprising the step of sensing the rotational direction of a member which rotates in one direction in the forward direction of movement of the vehicle and in the opposite direction in the reverse direction of movement of the vehicle and arming the system, upon sensing rotation of the member in said opposite direction and, while the system is thus armed and the vehicle is moving in the reverse direction, detecting the vehicle contacting an obstruction and thereby generating a signal to cause brake application.
2. A method as claimed in claim 1 including the step of releasing brake application to revert the system to the armed mode allowing for movement of the vehicle.
3. A method as claimed in claim 2 including the step of disarming the system when the vehicle moves forward.
4. A motor vehicle braking system comprising:
detector means, positioned on the vehicle, constructed and arranged to detect the vehicle contacting an obstruction when the vehicle is moving backwards and to generate a signal on said contact;
sensor means effective to sense the rotational direction of a member which rotates in one direction in the forward direction of movement of the vehicle and in the opposite direction in the reverse direction of movement of the vehicle, said sensor means serving, upon sensing rotation of the member in said opposite direction, to arm the system; and means actuable by the detector signal to cause brake application.
detector means, positioned on the vehicle, constructed and arranged to detect the vehicle contacting an obstruction when the vehicle is moving backwards and to generate a signal on said contact;
sensor means effective to sense the rotational direction of a member which rotates in one direction in the forward direction of movement of the vehicle and in the opposite direction in the reverse direction of movement of the vehicle, said sensor means serving, upon sensing rotation of the member in said opposite direction, to arm the system; and means actuable by the detector signal to cause brake application.
5. A braking system as claimed in claim 4 including means to release brake application to revert the system to the armed mode for movement of the vehicle.
6. A braking system as claimed in claim 5 including means to disarm the system when the vehicle moves forward.
7. A braking system as claimed in claim 4 in which the means to cause brake application is pneumatic.
8. A braking system as claimed in claim 4 in which the sensor means comprises a pair of spaced opposed interacting magnet means, one mounted on an element of the vehicle and movable therewith and the other mounted on a fixed element of the vehicle.
9. A unit connectable to a braking system of a vehicle for automatically actuating the braking system, said unit comprising:
detector means actuable to generate a signal whenever the vehicle contacts an obstruction while moving backwards;
sensor means constructed and arranged to sense the rotational direction of a member which rotates in one direction on the forward direction of movement of the vehicle and in the opposite direction on the reverse direction of movement of the vehicle, and thereby to sense rearward movement of the vehicle;
pneumatic means connected with the sensor means to arm the braking system thereby enabling the detector signal to cause brake application on said rearward movement; and pneumatic means actuable by the detector signal to cause said brake application.
detector means actuable to generate a signal whenever the vehicle contacts an obstruction while moving backwards;
sensor means constructed and arranged to sense the rotational direction of a member which rotates in one direction on the forward direction of movement of the vehicle and in the opposite direction on the reverse direction of movement of the vehicle, and thereby to sense rearward movement of the vehicle;
pneumatic means connected with the sensor means to arm the braking system thereby enabling the detector signal to cause brake application on said rearward movement; and pneumatic means actuable by the detector signal to cause said brake application.
10. A unit as claimed in claim 9 in which the detector means is pneumatic.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB858516011A GB8516011D0 (en) | 1985-06-25 | 1985-06-25 | Motor vehicle braking system |
| GB8516011 | 1985-06-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1300210C true CA1300210C (en) | 1992-05-05 |
Family
ID=10581270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000512336A Expired - Lifetime CA1300210C (en) | 1985-06-25 | 1986-06-24 | Motor vehicle braking system |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1300210C (en) |
| GB (2) | GB8516011D0 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013106878A1 (en) * | 2013-07-01 | 2015-01-08 | Bpw Bergische Achsen Kg | Reversing-assist device |
| US11117430B2 (en) | 2019-05-21 | 2021-09-14 | Volvo Truck Corporation | Interface system of a transfer dump truck |
| DE102021101787A1 (en) | 2021-01-27 | 2022-07-28 | Zf Cv Systems Global Gmbh | Method for approaching a vehicle to a loading ramp, control device and vehicle |
-
1985
- 1985-06-25 GB GB858516011A patent/GB8516011D0/en active Pending
-
1986
- 1986-06-23 GB GB08615299A patent/GB2177767B/en not_active Expired
- 1986-06-24 CA CA000512336A patent/CA1300210C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| GB2177767B (en) | 1989-01-18 |
| GB2177767A (en) | 1987-01-28 |
| GB8516011D0 (en) | 1985-07-31 |
| GB8615299D0 (en) | 1986-07-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |