GB2307308A - Engaging and controlling power take-off - Google Patents
Engaging and controlling power take-off Download PDFInfo
- Publication number
- GB2307308A GB2307308A GB9523683A GB9523683A GB2307308A GB 2307308 A GB2307308 A GB 2307308A GB 9523683 A GB9523683 A GB 9523683A GB 9523683 A GB9523683 A GB 9523683A GB 2307308 A GB2307308 A GB 2307308A
- Authority
- GB
- United Kingdom
- Prior art keywords
- power take
- control unit
- engine
- vehicle
- unit
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000001934 delay Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000005611 electricity Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000994 depressogenic effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K25/00—Auxiliary drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
- F02D31/007—Electric control of rotation speed controlling fuel supply
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- General Engineering & Computer Science (AREA)
- Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Arrangement And Driving Of Transmission Devices (AREA)
Abstract
A method of and a control unit for a power take-off system of a vehicle. An electronic control unit 8 is incorporated into the design of a special purpose vehicle. The special purpose vehicle has a power take-off facility 7 which provides power for an ancillary unit 9, 10 such as a generator for electricity, hydraulic power or compressed air. The control unit automatically ensures that the power take-off is engaged safely after pre-requisite conditions have been met. The power take-off is engaged automatically by operating an electrical switch. Once the power take-off system is engaged, the control unit maintains the correct engine speed required by the ancillary drive. The unit serves to monitor operating status and displays the current system condition on a control unit.
Description
CONTROL UNIT
This invention relates to a control unit for sequencing and monitoring a power take off (hereafter PTO) system.
PTO systems have for many years been fitted to vehicles to enable the engine to be used as a power source for the generation of compressed air, electrical power, hydraulic power. Typically this is arranged by the use of an additional gearbox fitted to the transmission of the vehicle, brought into operation by the use of a mechanical lever fitted inside the cab of the vehicle. PTO can be achieved in two ways. in one arrangement the JYFO operates at the same time as providing drive to the drive wheels. in an alternative arrangement power output from the transmission is disconnected from the driving wheels and provides power to drive ancillary equipment (an air compressor for example). In this instance, once the vehicle is being used in PTO mode, the vehicle is unmanned.The present application concerns PTO on an unmanned stationary vehicle where engine speed control is critical to provide correct performance of the driven device for which a high precision speed control device is normally fitted.
The procedure for switching the system into PTO mode is: The vehicle is parked with the handbrake applied.
2 The clutch is depressed fully.
3 The appropriate gear on the vehicle transmission is selected.
4 The PTO lever is operated manually to switch power from the driven wheels
to the appropriate device.
5 The clutch pedal is released slowly.
6 The controller now comes into operation to maintain correct engine speed.
Known vehicle systems have exhibited the following shortcomings 1 The handbrake may not be fully applied, leading to the possibility that the
unmanned vehicle may roll away out of control.
2 The clutch may not be fully depressed, preventing correct engagement,
causing possible damage to the gearbox.
3 The approyriate gear may not be selected leading to an incorrect speed on the
driven device.
4 The PTO lever may require some careful manipulation to ensure correct
engagement.
5 If the clutch pedal is released too quickly it is possible to stall the engine.
6 Once the system is in operation the system is no longer being monitored by
the driver looking at the instrument panel.
It is also possible for to inadvertently operate the PTO lever whilst the vehicle is being driven causing untold damage to the gearbox.
It has been found possible to overcome these shortcomings with the present invention.
According to the present invention there is provided a PTO control unit adapted to ensure that engagement of the PTO can only occur once pre-requisite conditions have been fulfilled; that sequences the engagement of the PTO and the control of engine speed ; and that maintains a monitoring function on the operating status of the engine and key ancillary components.
An exemplary embodiment of the invention will now be described with reference to the accompanying drawing of which the sole figure is an outline diagram of a vehicle equipped with a PTO system.
Vehicle 1 is shown with a drive train comprising gearbox 3, propshaft 4a & 4b, PTO unit 7 and driven wheels 5. In normal driven mode, engine 2 provides power to the driven wheels 5. The PTO unit 7 has no effect on the remainder of the driveline. For use in a PTO mode, the control box 6 in the drivers cab C of the vehicle is used to select the appropriate mode of operation. By operating a push button an engine management unit 8 automatically sequences and controls engine speed and PTO unit engagement into the driveline whilst simultaneously monitoring essential safety parameters. Once PTO mode has been engaged, the PTO unit 7 no longer provides power to the driven wheels 5 but now provides power to drive alternator 9, and compressor I(). The engine management unit 8 now ensures that the PTO unit 7 operates at the correct speed.
There are several proprietary engine control systems available. Most offer a number of spare inputs and outputs which can be interfaced with whilst the system is in a "TO mode. This makes it possible to monitor system parameters and in the event any go outside pre-determined levels, the control box will safely bring the system to
a halt by stopping the engine and dis-engaging, the PTO unit 7 in an orderly
fashion. The reason for the shut down is displayed on a panel of control box 6.
The control box 6 can incorporate or be coupled to a data logging unit to provide a
records of the operations undertaken involving the "TO unit 7.
Claims (14)
1 A method of operating a power take-off on a vehicle comprising the steps of
selecting a stored monitoring program, checking that pre-requisite conditions
in the program are met, regulating speed of an engine providing power to the
power take-off and maintaining a monitoring function on operating status of
the engine and of ancillary components relating to the power take-off.
2 A method as claimed in Claim 1 comprising the further step of data logging
operating parameters relating to the power take-off during operation of the
power take-off.
3 A method as claimed in any preceding claim including the further step of
displaying one or more indicators as to the monitored status.
4 A method as claimed in any preceding claim including the further step of
providing for automatic engine speed control in response to predetermined
monitored functions levels.
5 A control unit ensuring that engagement of a power take off unit can only
occur once pre-requisite conditions have been fulfilled, sequences the
engagement of the power take-off unit and control of speed of an engine
powering the power take-off unit and maintains a monitoring function on the
operating status of the engine and key ancillary components
6 A control unit as in Claim 5 in which the control unit is adapted to provide
an indication of a monitored function.
7 A control unit as claimed in Claim 5 or Claim 6 including manually operable
devices providing for the selection of device driven by way of the power take
off.
8 A control unit as claimed in Claims 5, 6 or 7 incorporating a data logging
function.
9 A control unit as claimed in Claims 5, 6, 7 or 8 incorporating means for
providing for speed control of an engine powering the power take off and or
the power take off.
10 A control unit as claimed in any of preceding Claims 5 to 9 incorporating a
switching solenoid or an electrically operated actuator.
11 A control unit as claimed in Claim 5 incorporating means for adjusting
sequences and delays by remote programming or indicating device.
12 A vehicle having a method of operating a power take-off for an engine of the
vehicle as claimed in any preceding of claims 1 to 4.
13 A vehicle equipped with a control unit as claimed in any of preceding claims
5 to 11.
14 A vehicle equipped as hereinbefore described with reference to and as
illustrated in the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9523683A GB2307308B (en) | 1995-11-20 | 1995-11-20 | Method of control, control unit and a vehicle equipped therewith |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9523683A GB2307308B (en) | 1995-11-20 | 1995-11-20 | Method of control, control unit and a vehicle equipped therewith |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9523683D0 GB9523683D0 (en) | 1996-01-24 |
| GB2307308A true GB2307308A (en) | 1997-05-21 |
| GB2307308B GB2307308B (en) | 1999-03-17 |
Family
ID=10784147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9523683A Expired - Fee Related GB2307308B (en) | 1995-11-20 | 1995-11-20 | Method of control, control unit and a vehicle equipped therewith |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2307308B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2577110A (en) * | 2018-09-14 | 2020-03-18 | Applied Concepts Ltd | Pressurised air generating system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4597301A (en) * | 1984-03-30 | 1986-07-01 | Dana Corporation | Power takeoff speed control assembly |
| US4715012A (en) * | 1980-10-15 | 1987-12-22 | Massey-Ferguson Services N.V. | Electronic tractor control |
| EP0677415A2 (en) * | 1994-04-14 | 1995-10-18 | New Holland U.K. Limited | Power take-off electronic control with RPM interlock |
-
1995
- 1995-11-20 GB GB9523683A patent/GB2307308B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4715012A (en) * | 1980-10-15 | 1987-12-22 | Massey-Ferguson Services N.V. | Electronic tractor control |
| US4597301A (en) * | 1984-03-30 | 1986-07-01 | Dana Corporation | Power takeoff speed control assembly |
| EP0677415A2 (en) * | 1994-04-14 | 1995-10-18 | New Holland U.K. Limited | Power take-off electronic control with RPM interlock |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2577110A (en) * | 2018-09-14 | 2020-03-18 | Applied Concepts Ltd | Pressurised air generating system |
| GB2577110B (en) * | 2018-09-14 | 2022-12-07 | Applied Concepts Ltd | Pressurised air generating system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2307308B (en) | 1999-03-17 |
| GB9523683D0 (en) | 1996-01-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20031120 |