WO1990000678A1 - Monitoring device for the position regulator in an electronic accelerator pedal - Google Patents

Monitoring device for the position regulator in an electronic accelerator pedal Download PDF

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Publication number
WO1990000678A1
WO1990000678A1 PCT/EP1988/000611 EP8800611W WO9000678A1 WO 1990000678 A1 WO1990000678 A1 WO 1990000678A1 EP 8800611 W EP8800611 W EP 8800611W WO 9000678 A1 WO9000678 A1 WO 9000678A1
Authority
WO
WIPO (PCT)
Prior art keywords
butterfly valve
integrator
position sensor
accelerator pedal
zero
Prior art date
Application number
PCT/EP1988/000611
Other languages
French (fr)
Inventor
Cornelius Peter
Karl-Heinrich Preis
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to US07/466,346 priority Critical patent/US5167212A/en
Priority to DE8888907042T priority patent/DE3867483D1/en
Priority to EP19880907042 priority patent/EP0376969B1/en
Priority to PCT/EP1988/000611 priority patent/WO1990000678A1/en
Publication of WO1990000678A1 publication Critical patent/WO1990000678A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/107—Safety-related aspects

Definitions

  • the invention relates to a monitoring device for an electronic accelerator pedal in a motor vehicle of the type set forth in the main claim.
  • a protective and monitoring device for an electronic accelerator pedal in motor vehicles is also already known from German Offenlengsschrift No.
  • an accelerator pedal position sensor in the form of a potentiometer is connected to the accelerator pedal and supplies a desired value to a first regulator which receives an actual value from a potentiometer connected to the butterfly valve so that the first regulator forms a control difference and hence drives the servo-motor of the butterfly valve by way of an output stage.
  • the traditional mechanical adjustment of the butterfly valve is implemented electronically in this manner.
  • a control difference is formed by subtraction of the actual value from the desired value and is applied to a second regulator to form a variable quantity filtered from the dynamic behaviour of the control loop.
  • a window comparator detects whenever this variable quantity lies outside desired limits and can activate a fault warning device accordingly.
  • the present invention seeks to improve on the latter arrangement.
  • a monitoring device in accordance with the present invention and having the characterising features of the main claim has the advantage that it monitors the basic control loop of the position regulator in a slave circuit and provides a check for the presence of a permanemt control error.
  • Fig. 1 shows a basic known electronically controlled butterfly valve
  • Fig. 2 shows a digital version of the basic arrangement of Fig. 1;
  • Fig. 3 shows how the basic arrangements of Fig. 1 or 2 may be modified in accordance with the present invention. Description of the Embodiment
  • an accelerator pedal 1 is mechanically connected to an accelerator pedal position sensor 2 in the form of a potentiometer whose resistance is proportional to the adjusted angle of the accelerator pedal 1.
  • the resistance of the accelerator pedal position sensor 2 constitutes a desired value ⁇ D for a regulator 3 which is connected to the accelerator pedal position sensor 2.
  • the regulator 3 controls an output stage 4 for a servo-motor 5 of a butterfly valve 7 of a motor vehicle.
  • the servo-motor 5 is mechanically connected to the butterfly valve 7 and to a butterfly valve position sensor 6 which, like the accelerator pedal position sensor 2, is a potentiometer, so that the resistance of the butterfly valve position sensor 6 supplies the regulator 3 with an actual value ⁇ A of the position of the butterfly valve 7.
  • a control loop is thereby closed.
  • the regulator 3 shown in Fig. 1 is a PID regulator which controls the output stage 4 in dependence upon an analog control difference.
  • the known onitoring device may also function with other types of regulators, such as switching regulators which only take the sign of the control difference into account, provided that the transient response of the closed control loop exhibits a diminishing control difference.
  • the present irmention is not limited only to the emboidment of a butterfly position control shown in Fig. 1.
  • Fig. 2 shows the known system of Fig. 1 in digital form, similar parts being given the same reference numerals.
  • the analog signal from the pedal transducer 2 is converted at 8 into an 8-bit digital signal which is applied to an adding element 9 of the PID regulator 3.
  • the PID regulator is chosen to have a scanning time of the order of 5ms.
  • the PID regulator 3 supplies, via the output stage 4, polarised output signals M + M ⁇ to control the direction of operation of the servo ⁇ motor 5.
  • the butterfly valve position sensor 6 (not shown in Fig. 2) supplies a feedback signal representative of the actual butterfly valve position, the latter signal being converted into a 10-bit digital signal for processing by the regulator 3.
  • the operating state of the basic master control circuit 10 of Fig. 1 or Fig. 2 is monitored in a slave circuit 12 in order to check for the existence of permanent control errors.
  • a permanent control error will exist in the presence of any one or more of the following fault conditions, namely:
  • the master circuit 10 makes available to the slave circuit 12 signals ⁇ f*D and o(A (analog or digital) corresponding to the desired and actual values of the butterfly valve angle and the difference otE between them is established in a subtractor element 1 .
  • An integrator 16 in the slave integrates the difference ⁇ (E between the desired and actual value.
  • the output of the integrator is connected to a limit detector 18 such that an error condition is considered to have been established if the output of the integrator exceeds a predetermined limiting value. In this event, an "error present" signal is returned to the master circuit 10 via a line 20.
  • the integrator 16 is arranged to be re-set via a line 22 by means of a zero detector 24 which outputs an integrator re-set signal in the event that the difference signal o(E is zero and in the event also that there is a change of sign between the desired and actual values whereby a zero-crossing occurs.
  • an "adjusting element jammed" signal is arranged to be generated in the master circuit 10 and applied via a line 26 to the integrator re-set line 22 so as to re-set the integrator to zero.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

A monitoring device for an electronic accelerator pedal (1) in a motor vehicle has an accelerator pedal position sensor (2) mechanically connected to the accelerator pedal (1), a butterfly valve (7), a servo-motor (5) for the butterfly valve (7) and a butterfly valve position sensor (6) mechanically connected thereto. A regulator (3) receives a desired value (αD) from the accelerator pedal position sensor (2) and an actual value (αA) from the butterfly valve position sensor (6) and controls an output stage (4) for the servo-motor (5) in response to the comparison. A substractor (14) in a slave circuit (12) forms the difference (αE) between the desired (αD) and actual (αA) values of the butterfly valve opening angle. An integrator (16) integrates the control difference (αE) and is re-set to zero when the control difference (αE) is zero or changes sign, whereupon integration of the control difference (αE) is resumed. A limit device (18) indicates to a master circuit (10) the presence of a fault condition when the integrator output exceeds a predetermined limiting value.

Description

DE5CRIPTI0N MONITORING DEVICE FOR THE POSITION REGULATOR IN
AN ELECTRONIC ACCELERATOR PEDAL
Prior Art The invention relates to a monitoring device for an electronic accelerator pedal in a motor vehicle of the type set forth in the main claim.
A protective and monitoring device for an electronic accelerator pedal in motor vehicles is also already known from German Offenlengsschrift No.
3 430 077. In the latter device, an accelerator pedal position sensor in the form of a potentiometer is connected to the accelerator pedal and supplies a desired value to a first regulator which receives an actual value from a potentiometer connected to the butterfly valve so that the first regulator forms a control difference and hence drives the servo-motor of the butterfly valve by way of an output stage. The traditional mechanical adjustment of the butterfly valve is implemented electronically in this manner.
In accordance with DE-OS 3 430 077 a control difference is formed by subtraction of the actual value from the desired value and is applied to a second regulator to form a variable quantity filtered from the dynamic behaviour of the control loop. A window comparator detects whenever this variable quantity lies outside desired limits and can activate a fault warning device accordingly.
The present invention seeks to improve on the latter arrangement.
Advantages of the Invention
A monitoring device in accordance with the present invention and having the characterising features of the main claim has the advantage that it monitors the basic control loop of the position regulator in a slave circuit and provides a check for the presence of a permanemt control error. Drawinqs
The invention is described further hereinafter, by way of example only, with reference to the accompanying drawings, wherein:- Fig. 1 shows a basic known electronically controlled butterfly valve;
Fig. 2 shows a digital version of the basic arrangement of Fig. 1; and
Fig. 3 shows how the basic arrangements of Fig. 1 or 2 may be modified in accordance with the present invention. Description of the Embodiment
Referring first to the known arrangement of Fig. 1, an accelerator pedal 1 is mechanically connected to an accelerator pedal position sensor 2 in the form of a potentiometer whose resistance is proportional to the adjusted angle of the accelerator pedal 1. Hence, the resistance of the accelerator pedal position sensor 2 constitutes a desired value θ D for a regulator 3 which is connected to the accelerator pedal position sensor 2. The regulator 3 controls an output stage 4 for a servo-motor 5 of a butterfly valve 7 of a motor vehicle. The servo-motor 5 is mechanically connected to the butterfly valve 7 and to a butterfly valve position sensor 6 which, like the accelerator pedal position sensor 2, is a potentiometer, so that the resistance of the butterfly valve position sensor 6 supplies the regulator 3 with an actual value ^A of the position of the butterfly valve 7. A control loop, known to one skilled in the art, and not further described in order to simplify the drawing, is thereby closed. The regulator 3 shown in Fig. 1 is a PID regulator which controls the output stage 4 in dependence upon an analog control difference. However, the known onitoring device may also function with other types of regulators, such as switching regulators which only take the sign of the control difference into account, provided that the transient response of the closed control loop exhibits a diminishing control difference. Hence, the present irmention is not limited only to the emboidment of a butterfly position control shown in Fig. 1.
Fig. 2 shows the known system of Fig. 1 in digital form, similar parts being given the same reference numerals. In the digital system of Fig. 2, the analog signal from the pedal transducer 2 is converted at 8 into an 8-bit digital signal which is applied to an adding element 9 of the PID regulator 3. The PID regulator is chosen to have a scanning time of the order of 5ms. The PID regulator 3 supplies, via the output stage 4, polarised output signals M+ M~ to control the direction of operation of the servo¬ motor 5. The butterfly valve position sensor 6 (not shown in Fig. 2) supplies a feedback signal representative of the actual butterfly valve position, the latter signal being converted into a 10-bit digital signal for processing by the regulator 3. Referring now to Fig. 3, in the arrangement according to the present invention, the operating state of the basic master control circuit 10 of Fig. 1 or Fig. 2 is monitored in a slave circuit 12 in order to check for the existence of permanent control errors. A permanent control error will exist in the presence of any one or more of the following fault conditions, namely:
(a) the basic control is interrupted;
(b) there is no integral proportion in the regulator 3; (c) the regulating element, i.e. the motor 5, butterfly valve 7 or position sensing element, jams; (d) the battery voltage is too low.
The master circuit 10 makes available to the slave circuit 12 signals βf*D and o(A (analog or digital) corresponding to the desired and actual values of the butterfly valve angle and the difference otE between them is established in a subtractor element 1 . An integrator 16 in the slave integrates the difference ©(E between the desired and actual value. The output of the integrator is connected to a limit detector 18 such that an error condition is considered to have been established if the output of the integrator exceeds a predetermined limiting value. In this event, an "error present" signal is returned to the master circuit 10 via a line 20.
The integrator 16 is arranged to be re-set via a line 22 by means of a zero detector 24 which outputs an integrator re-set signal in the event that the difference signal o(E is zero and in the event also that there is a change of sign between the desired and actual values whereby a zero-crossing occurs.
In the event that the regulating element should become jammed in the forward direction, the system should not detect an error, since jamming may be due to freezing up. This error will therefore be eliminated automatically when the engine warms up. To prevent the system detecting a fault condition in these circumstances, therefore, an "adjusting element jammed" signal is arranged to be generated in the master circuit 10 and applied via a line 26 to the integrator re-set line 22 so as to re-set the integrator to zero.
Furthermore, on starting the motor vehicle, voltage drops may occur in the battery output so that the butterfly valve is unable to move into the desired position. If this were to be detected by the system as an error, then it would not be possible to properly start the motor vehicle in the event of low battery voltage. Thus, a "low battery voltage" signal is generated in the master circuit 10 and is again applied via the line 26 to re-set the integrator to zero.
Thus, lower battery voltage and the adjusting element being jammed are tolerated by the system without triggering an error condition in order to obtain better availability.

Claims

1. A monitoring device for an electronic accelerator pedal (1) in a motor vehicle, comprising an accelerator pedal position sensor (2) mechanically connected to the pedal (1), a servo-motor (5) for a butterfly valve (7) .of the motor vehicle and a butterfly valve position sensor (6) mechanically connected thereto, and a regulator (3) which receives a desired value from the accelerator pedal position sensor (2) and an actual value from the butterly valve position sensor (6) and controls an output stage (4) for the servo-motor (5), characterised in that a subtractor (14) in a slave circuit (12) forms the difference (e/E) between the desired C^D) and actual foA) values of the butterfly valve opening angle, that an integrator (16) integrates the control difference WE), the integrator (16) being re-set to zero when the control difference is zero or changes sign, whereupon integration of the control difference
Figure imgf000008_0001
is resumed, and that a limit device (18) indicates to a master circuit (10) the presence of a fault condition when the integrator output exceeds a predetermined limiting value.
2. A monitoring device according to claim 1, including a zero detector (24) connected to the output fe(E) of the subtractor (14) and providing an "integrator re-set" signal to the integrator (16) on a line (22) in the event that the control difference fo(E) is zero or changes sign.
3. A monitoring device according to claim 2, wherein a signal is arranged to be applied to the line (22) for re-setting the integrator to zero in the event that the battery voltage of the motor vehicle battery lies below a predetermined level.
4. A monitoring device according to claim 2 or 3, wherein a signal is arranged to be applied to the line
(22) for re-setting the integrator to zero in the event that the butterfly valve or its position sensor should jam.
PCT/EP1988/000611 1988-07-08 1988-07-08 Monitoring device for the position regulator in an electronic accelerator pedal WO1990000678A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US07/466,346 US5167212A (en) 1988-07-08 1988-07-08 Monitoring device for the position regulator in an electronic accelerator pedal
DE8888907042T DE3867483D1 (en) 1988-07-08 1988-07-08 MONITORING DEVICE FOR THE POSITION REGULATOR OF AN ELECTRONIC GAS PEDAL.
EP19880907042 EP0376969B1 (en) 1988-07-08 1988-07-08 Monitoring device for the position regulator in an electronic accelerator pedal
PCT/EP1988/000611 WO1990000678A1 (en) 1988-07-08 1988-07-08 Monitoring device for the position regulator in an electronic accelerator pedal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP1988/000611 WO1990000678A1 (en) 1988-07-08 1988-07-08 Monitoring device for the position regulator in an electronic accelerator pedal

Publications (1)

Publication Number Publication Date
WO1990000678A1 true WO1990000678A1 (en) 1990-01-25

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ID=8165304

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1988/000611 WO1990000678A1 (en) 1988-07-08 1988-07-08 Monitoring device for the position regulator in an electronic accelerator pedal

Country Status (4)

Country Link
US (1) US5167212A (en)
EP (1) EP0376969B1 (en)
DE (1) DE3867483D1 (en)
WO (1) WO1990000678A1 (en)

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EP1057995A3 (en) * 1999-06-01 2002-10-30 Isuzu Motors Limited Electronic fuel injection apparatus

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JP2003098044A (en) 2001-09-25 2003-04-03 Sanshin Ind Co Ltd Inspection device of marine structure, and inspection system of marine structure
JP4274954B2 (en) * 2003-03-06 2009-06-10 ヤマハ発動機株式会社 Electronic throttle control mechanism for outboard motor and small ship equipped with the same
US8240230B2 (en) 2005-01-18 2012-08-14 Kongsberg Automotive Holding Asa, Inc. Pedal sensor and method
JP4907935B2 (en) 2005-09-20 2012-04-04 ヤマハ発動機株式会社 Ship
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JP5100019B2 (en) 2006-03-17 2012-12-19 ヤマハ発動機株式会社 Remote control device, remote control ECU and ship
JP4836621B2 (en) 2006-03-20 2011-12-14 ヤマハ発動機株式会社 Remote control device and ship
JP4925701B2 (en) 2006-03-28 2012-05-09 ヤマハ発動機株式会社 Ship
JP4827596B2 (en) * 2006-04-21 2011-11-30 ヤマハ発動機株式会社 Ship remote control device and ship
JP4836671B2 (en) * 2006-06-02 2011-12-14 ヤマハ発動機株式会社 Remote control device, remote control ECU and ship
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JP4999387B2 (en) 2006-07-24 2012-08-15 ヤマハ発動機株式会社 Ship
US8000877B2 (en) * 2006-11-16 2011-08-16 Jean-François Aussilou Fuel economy system and method for a vehicle
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Also Published As

Publication number Publication date
EP0376969B1 (en) 1992-01-02
US5167212A (en) 1992-12-01
EP0376969A1 (en) 1990-07-11
DE3867483D1 (en) 1992-02-13

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