Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Patent
1990-03-08
1992-12-01
Wolfe, Willis R.
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
F02D 908
Patent
active
051672120
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a monitoring device for an electronic accelerator pedal in a motor vehicle.
BACKGROUND OF THE INVENTION
A protective and monitoring device for an electronic accelerator pedal in motor vehicles is also already known from U.S. Pat. No. 4,603,675. 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 electroncally in this manner. In accordance with U.S. Pat. No. 4,603,675, 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 behavior of the control loop. A window comparator detects whenever this variable quantity lies outside desired limits and can activate a fault warning device accordingly.
SUMMARY OF THE INVENTION
The present invention seeks to improve on the latter arrangement.
A monitoring device in accordance with the present invention includes an accelerator pedal position sensor mechanically connected to the pedal, a servomotor for a butterfly valve of the motor vehicle and a butterfly valve position sensor mechanically connected to the butterfly valve. A regulator is provided which receives a desired value from the accelerator pedal position sensor and an actual value from the butterfly valve position sensor and controls an output stage for the servomotor. The monitoring device also includes a subtractor in a slave circuit which forms the difference (.alpha.E) between the desired (.alpha.D) and actual (.alpha.A) values of the butterfly valve opening angle. An integrator integrates the control difference (.alpha.E) and is reset to zero when the control difference is zero or changes sign whereupon integration of the control difference (.alpha.E) is resumed. A limit device indicates to a master circuit the presence of a fault condition when the integrator output exceeds a predetermined limiting value.
The monitor device of the invention affords 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 permanent control error.
BRIEF DESCRIPTION OF THE DRAWINGS
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 PREFERRED EMBODIMENTS OF THE INVENTION
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 .alpha.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 .alpha.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 i
REFERENCES:
patent: 4353339 (1982-10-01), Collonia
patent: 4419973 (1983-12-01), Collonia
patent: 4508078 (1985-04-01), Takeuchi et al.
patent: 4603675 (1986-08-01), Junginger et al.
patent: 4622936 (1986-11-01), Junginger et al.
patent: 4901695 (1990-02-01), Kabasin et al.
patent: 5016588 (1991-05-01), Pagdin et al.
Peter Cornelius
Preis Karl-Heinrich
Ottesen Walter
Robert & Bosch GmbH
Wolfe Willis R.
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