GB2160682A - Control unit for an automotive vehicle - Google Patents
Control unit for an automotive vehicle Download PDFInfo
- Publication number
- GB2160682A GB2160682A GB08514425A GB8514425A GB2160682A GB 2160682 A GB2160682 A GB 2160682A GB 08514425 A GB08514425 A GB 08514425A GB 8514425 A GB8514425 A GB 8514425A GB 2160682 A GB2160682 A GB 2160682A
- Authority
- GB
- United Kingdom
- Prior art keywords
- control unit
- valve
- adjusting device
- way
- operating cylinder
- 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.)
- Withdrawn
Links
- 238000012544 monitoring process Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B63/00—Lifting or adjusting devices or arrangements for agricultural machines or implements
- A01B63/02—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors
- A01B63/10—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means
- A01B63/111—Lifting or adjusting devices or arrangements for agricultural machines or implements for implements mounted on tractors operated by hydraulic or pneumatic means regulating working depth of implements
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D15/00—Control of mechanical force or stress; Control of mechanical pressure
Abstract
A control unit for an automotive vehicle such as a tractor used in agriculture, wherein the drawing resistance of a cultivating device coupled to the tractor is variable. The cultivating device is controllable in such a way as to bring about a substantially constant traction. For ascertaining the wheel speeds at the vehicle axles, measuring devices connected to a monitoring electronics (10) are arranged. Below a predeterminable wheel speed difference, the cultivating device is influenced by a hydraulic adjusting device (5) connected to an auxiliary pressure source (1) and by an operating cylinder (8) connected downstream. If the predetermined wheel speed difference is exceeded device 5 is disconnected by a valve 9 and the working chamber (11) of the operating cylinder (8) is connectible to the auxiliary pressure source (1) or an unpressurised supply reservoir (3) via valves (12 or 13) controllable by the electronics unit (10). Preferably, the unit (10) works digitally and the valve means (12, 13) are actuated in a pulsed manner. <IMAGE>
Description
SPECIFICATION
Control unit for an automotive vehicle
The present invention relates to a control unit for an automotive vehicle in particular for a tractor used in agriculture, of the kind wherein the drawing resistance of a cultivating device coupled to the vehicle is variable, the cultivating device being controllable in such a way as to bring about a substantially constant traction, wherein measuring devices connected to a monitoring electronics unit are arranged to ascertain the wheel speeds at the vehicle axles, and wherein if a predeterminable wheel speed difference is exceeded, the cultivating device is controllable by means of a hydraulic adjusting device connected to an auxiliary pressure source and by means of an operating cylinder connected downstream, with a view to reducing the drawing resistance.Such a control unit forms the subject of our copending application No. 8507758.
It has proved to be particularly advantageous in a control unit of the kind referred to for slip to be kept comparatively low while optimal traction is ensured. From this it results directly that efficiency is increased compared with known units and that on the other hand, a favourable energy consumption is attained.
In comparison with an operation at higher slip values, there is the further advantage that the working speed of the tractor is increased so that a greater unit of area per time unit is attainable.
In particular, it is an object of the present invention to simplify the subject matter of patent application 8507758 in respect of the actuation of the operating cylinder.
According to the invention in its broadest aspect a control unit for an automotive vehicle of the kind referred to is characterised in that a working chamber of the operating cylinder is connectible to the auxiliary pressure source or to an unpressurised supply reservoir via first valve means which are controllable by the monitoring electronics unit.
By using the invention it becomes possible to design retroactively a hydraulic unit which is already available in a tractor.
In accordance with a feature of the present invention, second valve means are arranged between the adjusting device and the operating cylinder which permit the hydraulic connection between the adjusting device and the operating cylinder tq be closed by the monitoring electronics unit when the first valve means is actuated. This has the special advantage that the pressure prevailing in the working chamber of the operating cylinder is adjustable completely independently of the output pressure of the hydraulic adjusting device, a reaction on the adjusting device being prevented at the same time.
According to another feature of the present invention, two electrically controllable twoway/two-position directional control valves are employed as the first valve means, one two-way/two-position directional control valve allowing a connection to be established between the working chamber and the auxiliary pressure source, while the other twoway/two-position directional control valve provides a communication between the working chamber and the unpressurised supply reservoir. Such two-way/two-position directional control valves, which are electrically actuatable, are normally simple and reliably operating, standardised components. In principle, the two-way/two-position directional control valves can be replaced by one three-way/twoposition directional control valve.When two two-way/two-position directional control valves are employed, there is the possibility of keeping the pressure in the working chamber of the hydraulic operating cylinder constant for a longer period of time.
According to another feature, the first valve means are actuated in a pulsed manner. In this arrangement, the pulse frequency may be variable and may, for instance, range between 20 hertz and several hundred hertz. Therefore, rapidly changing-over seat valves can be employed as two-way/two-position directional control valves. Such valves are of particularly simple design and correspondingly inexpensive. Moreover, a relatively small overall size is attained when such valves are employed.
Furthermore, seat valves bear the advantage of their being no internal leakage in their inactive position. The pulsewise actuation of the valves renders it possible to provide a continuous digital signal processing, as a result whereof there is less expenditure in electronics due to their being no need for analogdigital converters. Depending on how the pulse/pause ratio of the actuation is chosen, any pressure variation rate whatsoever can be adjusted in the working chamber of the operating cylinder, while the behaviour of pressure variation is not distinguishable from the pressure variation behaviour in using proportionally working valves.
According to another feature, inserted downstream of the hydraulic adjusting device is a two-way/two-position directional control valve which normally assumes its opened position. This two-way/two-position directional control valve changes over as soon as control signals are issued to the first valve means.
After the two-way/two-position directional control valve inserted after the hydraulic adjusting device has been changed over, the connection between the adjusting device and the operating cylinder will be interrupted so that the pressure in the working chamber of the operating cylinder can be adjusted via the first valve means, without any resulting reaction on the adjusting device.
According to a further feature, electrical pickups for measuring data are connected to the adjusting device which supplies the adjusting device with signals that are proportional to traction and/or the position of the cultivating device. This further increases the efficiency of the automotive vehicle, while the energy consumption is still decreasing.
It is furthermore expedient to have the first and the second valve means combined to form a valve block. In this respect, it may also be favourable with a view to obtaining a particularly compact device, if the valve block is integrated into the housing of the adjusting device.
An embodiment of the invention will now be described by way of example with reference to the accompanying drawing.
In the drawing reference numeral 1 designates a pressure fluid pump, the suction side 2 thereof being in communication with an unpressurised supply reservoir 3. The delivery side 4 of the pressure fluid pump 1 is in hydraulic connection with an adjusting device 5 which is adjustable by means of an adjusting lever 6 so that, depending upon the position of the adjusting lever 6, hydraulic pressure is available at the outlet 7 of the adjusting device.
At the outlet 7 of the adjusting device 5, a disconnecting valve 9 which is controllable by a monitoring electronics unit 10 is arranged in a hydraulic line connected to an operating cylinder 8. This disconnecting valve 9 is designed as a two-way/two-position directional control valve and normally assumes its opened position in which the outlet 7 of the adjusting device 5 is connected with a working chamber 11 of the operating cylinder 8.
Corresponding actuation of the disconnecting valve 9 by the monitoring electronics unit allows the connection between the adjusting device 5 and the operating cylinder 8 to be interrupted.
Arranged between the delivery side 4 of the pressure fluid pump 1 and the working chamber 11 of the operating cylinder 8 is another two-way/two-position directional control valve 1 2 which is likewise controllable by the monitoring electronics unit 10 and which normally assumes its closed position. Furthermore, a two-way/two-position directional control valve 1 3 is connected to the working chamber 11 of the operating cylinder 8 which normally assumes its closed position and which, upon suitable actuation by the monitoring electronics unit 10, can be switched to adopt a position in which the working chamber 11 of the operating cylinder 8 is connected with the unpressurised supply reservoir 3.
Also connected to the adjusting device 5 are pickups for measuring data 14 which supply the adjusting device with electric signals characteristic of the traction or the position of the cultivating device.
.In a cylinder bore of the operating cylinder 8, a piston is guided which is in operative connection with the connected cultivating device so that displacement of the piston allows the traction acting on the tractor to be varied.
The mode of function of the control unit described will be explained in more detail hereinbelow. During operation of the device, the pressure fluid pump 1 generates a hydraulic pressure which is delivered to the adjusting device 5. Therefore, in dependence on the position of the adjusting lever 6, a hydraulic pressure will be developed at the outlet 7 of the adjusting device 5 which propagates via the disconnecting valve 9, in its opened position, to the working chamber 11 of the operating cylinder 8 so that the piston of the operating cylinder 8 and, respectively, the cultivating device connected to the piston of the operating cylinder 8 will adopt a predetermined position. In the hydraulic unit according to the present invention, the numbers of revolutions of the axles of the tractor are permanently measured by sensors (not shown) and supplied to the monitoring electronics unit 10.When the monitoring electronics unit 10 recognises that the difference between the numbers of revolutions of the axles of the tractor has exceeded a predetermined threshold value, a corresponding control signal will be issued to the disconnecting valve 9, thus interrupting a hydraulic connection between the outlet 7 of the adjusting device 5 and the working chamber 11 of the operating cylinder 8. The monitoring electronics unit 10 allows the two-way/two-position directional control valves 12, 1 3 to be actuated to cause the numbers of revolutions of the monitored axles to conform to one another again.Depending on the design of a leverage coupled to the piston of the operating cylinder 8, it may be provided for instance that e.g. an attached plough will reduce its ploughing depth by virtue of pressurisation of the working chamber 11 when the two-way/two-position directional control valve 12 is actuated, so that the drawing resistance is reduced. Similarly, pressure fluid is removed from the working chamber 11 of the operating cylinder 8 by virtue of actuation of the two-way/two-position directional control valve 13, with the valve 1 2 closed, so that the ploughing depth is increased. Such control for the system has as a result that the predetermined nominal slip value will be obtained at the driven rear axle of the tractor.
The digital operation of the monitoring electronics 1 2 enables the two-way/two-position directional control valves 12, 1 3 to be operated in a pulsed manner. This permits the pulse/pause ratio to be varied at will. In such an operation of the hydraulic system, the signals supplied to the adjusting device 5 by the pickup for measuring data 14 are of no effect.
Claims (11)
1. A control unit for an automotive vehicle, in particular for a tractor used in agriculture, of the kind wherein the drawing resistance of a cultivating device coupled to the vehicle is variable, the cultivating device being controllable in such a way as to bring about a substantially constant traction, wherein measuring devices connected to a monitoring electronics unit are arranged to ascertain the wheel speeds at the vehicle axles, and wherein, if a predeterminable wheel speed difference is exceeded, the cultivating device is controllable by means of a hydraulic adjusting device connected to an auxiliary pressure source and by means of an operating cylinder connected downstream, with a view to reducing the drawing resistance, characterised in that a working chamber (11) of the operating cylinder (8) is connectible to the auxiliary pressure source (1) or to an unpressurised supply reservoir (3) via a first valve mans (12, 1 3) which are controllable by the monitoring electronics unit (10).
2; A control unit as claimed in claim 1, characterised in that second valve means are arranged between the adjusting device (5) and the operating cylinder (8) which permit the hydraulic connection between the adjusting device (5) and the operating cylinder (8) to be closed by the monitoring electronics unit (10) when the first valve means (12, 13) is actuated.
3. A control unit as claimed in claim 1, characterised in that two electrically controllable two-way/two-position directional control valves (12, 13) are employed as the first valve means, one two-way/two-position directional control valve (12) allowing a connection to be established between the working chamber (11) and the auxiliary pressure source (1), while the other two-way/two-position directional control valve (13) provides a communication between the working chamber (11) and the unpressurised supply reservoir (3).
4. A control unit as claimed in claim 3, characterised in that the two-way/two-position directional control valves (12, 13) are replaced by one three-way/two-position directional control valve.
5. A control unit as claimed in claim 1, 3 or 4, characterised in that the first valve means (12, 13) are actuated in a pulsed manner, the pulse frequency being preferably in the range between 20 hertz and several hundred hertz.
6. A control unit as claimed in claim 5, characterised in that rapidly changing-over seat valves are used as two-way/two-position directional control valves (12, 13).
7. A control unit as claimed in claims 1 and 2, characterised in that inserted downstream of the hydraulic adjusting device (5) is a twoway/two-position directional control valve (9) normally assuming its opened position.
8. A control unit as claimed in any one of the preceding claims, characterised in that electrical pickups for measuring data are connected to the adjusting device which supplies the adjusting device (5) with signals that are proportional to traction and/or to the position of the cultivating device.
9. A control unit as claimed in any one of the preceding claims, characterised in that the first valve means (12, 1 3) and the second valve means (9) are combined to form a valve block.
1 0. A control unit as claimed in claim 9, characterised in that the valve block is integrated into the housing of the adjusting device (5).
11. A control unit for an automotive unit substantially as described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19843423032 DE3423032A1 (en) | 1984-06-22 | 1984-06-22 | CONTROL DEVICE FOR MOTOR VEHICLES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8514425D0 GB8514425D0 (en) | 1985-07-10 |
| GB2160682A true GB2160682A (en) | 1985-12-24 |
Family
ID=6238892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08514425A Withdrawn GB2160682A (en) | 1984-06-22 | 1985-06-07 | Control unit for an automotive vehicle |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS6121007A (en) |
| DE (1) | DE3423032A1 (en) |
| FR (1) | FR2566225A1 (en) |
| GB (1) | GB2160682A (en) |
| IT (1) | IT1184243B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5190111A (en) * | 1991-06-03 | 1993-03-02 | Ford New Holland, Inc. | Hitch positioning with slip override control and calibrated wheel speed for determining slip |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4322355A1 (en) * | 1993-07-05 | 1995-01-12 | Rexroth Mannesmann Gmbh | SHR/EHR system for lifting mechanisms |
| JP4434557B2 (en) | 2001-07-31 | 2010-03-17 | ヤマハ株式会社 | Power amplifier circuit |
| JP3820947B2 (en) | 2001-09-21 | 2006-09-13 | ヤマハ株式会社 | Class D amplifier |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1557863A1 (en) * | 1966-07-18 | 1970-10-29 | Traktorenwerk Schoenebeck Veb | Control device for automatic depth control of tillage implements attached to tractors |
| DE2023346A1 (en) * | 1970-05-13 | 1971-12-02 | Bosch Gmbh Robert | Electronic slip measuring device |
| US3702575A (en) * | 1971-06-01 | 1972-11-14 | Nasa | Redundant hydraulic control system for actuators |
| US3814188A (en) * | 1972-10-02 | 1974-06-04 | Allis Chalmers | Electronic draft load sensing system |
| IL42615A0 (en) * | 1973-06-27 | 1973-08-29 | Technion Res & Dev Foundation | Load control for wheeled traction vehicles |
| FI54981C (en) * | 1974-02-27 | 1979-04-10 | Valmet Oy | REGLERINGSSYSTEM FOER TRAKTOR |
| IT1043594B (en) * | 1975-10-23 | 1980-02-29 | Magneti Marelli Spa | SYSTEM AND DEVICE FOR THE CONTROL OF THE REINFORCEMENT DEPTH OF AN AGRICULTURAL TRACTOR |
| NL169711C (en) * | 1977-06-01 | 1982-08-16 | Ihc Holland Nv | DEVICE FOR CONSTANTLY KEEPING THE TENSION TENSION IN A CABLE. |
| US4173259A (en) * | 1977-12-29 | 1979-11-06 | Allis-Chalmers Corporation | Rear drive assembly with load sensing |
| JPS54123418A (en) * | 1978-03-17 | 1979-09-25 | Kubota Ltd | Lifttarm driving device of tractor |
| NL7811964A (en) * | 1978-12-08 | 1980-06-10 | Lely Nv C Van Der | TRACTOR. |
| JPS5581503A (en) * | 1978-12-15 | 1980-06-19 | Ishikawajima Shibaura Mach | Draft control device of farming tractor |
| JPS55111706A (en) * | 1979-02-15 | 1980-08-28 | Kubota Ltd | Automatic lifting device of soil treating machine |
| DE2952245A1 (en) * | 1979-12-24 | 1981-07-02 | Xaver Fendt & Co, 8952 Marktoberdorf | Hydraulic control of tractor plough - has directional flow hydraulic valve circuit to control motion by use of cam with special curve profile |
| DE3025018A1 (en) * | 1980-07-02 | 1982-01-21 | Sunvic Regler Gmbh, 5650 Solingen | Pneumatic proportional regulator with manual and automatic modes - has balanced pneumatic stage that responds to pressure differential to control output |
| DE3102688A1 (en) * | 1981-01-28 | 1982-08-12 | Eckardt Ag, 7000 Stuttgart | Pneumatic controller station |
| US4518044A (en) * | 1982-03-22 | 1985-05-21 | Deere & Company | Vehicle with control system for raising and lowering implement |
| DE3235818A1 (en) * | 1982-09-28 | 1984-03-29 | Robert Bosch Gmbh, 7000 Stuttgart | Device for controlling the working depth of a soil-cultivating appliance |
| DE3413435A1 (en) * | 1984-04-09 | 1985-10-17 | Alfred Teves Gmbh, 6000 Frankfurt | CONTROL DEVICE FOR MOTOR VEHICLES |
-
1984
- 1984-06-22 DE DE19843423032 patent/DE3423032A1/en not_active Ceased
-
1985
- 1985-06-07 GB GB08514425A patent/GB2160682A/en not_active Withdrawn
- 1985-06-19 FR FR8509317A patent/FR2566225A1/en not_active Withdrawn
- 1985-06-20 IT IT21224/85A patent/IT1184243B/en active
- 1985-06-21 JP JP60134436A patent/JPS6121007A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5190111A (en) * | 1991-06-03 | 1993-03-02 | Ford New Holland, Inc. | Hitch positioning with slip override control and calibrated wheel speed for determining slip |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1184243B (en) | 1987-10-22 |
| JPS6121007A (en) | 1986-01-29 |
| IT8521224A0 (en) | 1985-06-20 |
| FR2566225A1 (en) | 1985-12-27 |
| GB8514425D0 (en) | 1985-07-10 |
| DE3423032A1 (en) | 1986-01-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |