JPS6073335A - Accuracy correcting apparatus of engine operation state detector - Google Patents

Abstract

PURPOSE:To automatically correct the accuracy of an engine operation state detector, by detecting the operation state of an engine from the manipulation position of a manipulator while comparing the detection value with a corresponding set value, and renewing the set value when predetermined relation is shown. CONSTITUTION:A throttle valve 11 comes to a manipulator for manipulating the operation state of an engine and arranged in an air intake passage 13. A potentiometer 15 functions as an engine operation state detector for detecting the operation state from the manipulating position of the manipulator and is cooperated with the opening and closing of the valve 11 while a slide brush 17 is slid on a resistor 19 to detect the opening and closing position of the valve. The detection signal is inputted to a microcomputer 27 through an A/D converter 25. The computer 27 has CPU29 and the initial resistance of the potentiometer 15 corresponding to the full open position and the full close position of the valve 11 is stored in ROM31 as set value while the detection value of the potentiometer 15 is compared with the set value and the renewed set value is stored in RAM 33. As mentioned above, the accuracy of the engine operation state detector can be automatically corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application!'IF) The present invention relates to a device for correcting the placement of an engine operating state detector for detecting the engine operating state of an internal combustion engine.

(Prior art) Conventionally, to detect the operating state of an internal combustion engine, a potentiometer linked to a throttle valve is used to detect the resistance value of the potentiometer corresponding to the fully open position and the fully open position of the throttle valve. Ta.

(Problems with the prior art) In such an engine operating state detector, the adjustment variations in the potentiometer assembly remain as they are; for example, if the throttle valve is installed in the fully closed position and adjusted, the adjustment will be made when the throttle valve is in the fully closed position. Adjustment variations due to the operator remain, and at the fully open position, the influence of variations in the resistance value of the full stroke of the potentiometer remains.

Therefore, if the detected resistance value is smaller than the design resistance value at the fully open position of the throttle valve, the fully open state of the throttle valve cannot be detected even though the throttle valve is fully open.
If the detected resistance value is larger than the design resistance value at the fully closed position of the throttle valve, even though the throttle valve is fully closed,
Unable to detect fully open throttle valve. Therefore, precision is required for adjustment during assembly, which places a heavy burden on the operator and increases the adjustment time. In order to reduce the variation in the potentiometer resistance value, the slope of the resistance value change with respect to the throttle valve opening change is strictly required. Furthermore, there is a problem in that accuracy corrections for full-open and changes in the full-open position must be manually performed to prevent gradual wear and tear of the throttle valve due to age-related changes.

(Object of the Invention) The present invention has been made to solve such problems, and uses an engine operating state detector to detect the operating position of an operating device that controls the operating state of the engine, and to detect the operating position of the operating device that controls the operating state of the engine, and to detect the operating position of the operating device that controls the operating state of the engine, and to detect the operating position of the operating device that controls the operating state of the engine, and to detect the operating position of the operating device that operates the operating state of the engine, and to detect the operating position of the operating device that controls the operating state of the engine, and to detect the operating position of the operating device that operates the operating state of the engine By comparing, the set value is updated with the detected value,
This is an attempt to automatically correct the error in the engine operating state detector.

(Summary of the invention) FIG. 1 is a block diagram clearly showing the configuration of the present invention.

The one-time correction device for the engine operating state detector of the present invention includes an operating device 11 for operating the operating state of the engine;
an engine operating state detector 15 that detects the operating state of the engine from the operating position of the female operating device 11; a storage means 30 that stores set values corresponding to the operating position of the female operating device 11; Comparing means 32 for comparing a detected value and a corresponding set value; and set value updating means 34 for updating the set value from the detected value when the comparison result shows a predetermined relationship.
It is equipped with

(Example) Hereinafter, the present invention will be described in detail based on the accompanying drawings.

FIG. 2 is a diagram showing an embodiment of the present invention. In the figure, reference numeral 11 denotes a throttle valve serving as an operating device for controlling the operating state of the engine, and is disposed in an intake passage 13.

The throttle valve 11 opens and closes based on the operation of an accelerator pedal (not shown), and controls the amount of air-fuel mixture sent to a cylinder (not shown).

Reference numeral 15 denotes a potentiometer that serves as an engine operating state detector that detects the engine operating state from the operating position of the operating device.
7 slides on a resistor 19, and detects the opening/closing position of the throttle valve 11 based on a change in resistance value. Note that the resistor 19
A power supply circuit 21 and a ground 23 are connected to both ends of the power supply circuit 21 .

Reference numeral 25 denotes an analog-to-digital converter (hereinafter referred to as an A/D converter), which converts an analog detection signal corresponding to the opening/closing position of the throttle valve 11, such as a fully open position or a fully closed position, into a digital detection signal.

27 is a microcomputer serving as an electronic control unit, which includes a central processing unit (OPU) 29 and a read-only memory (
ROM) 31, readable/writable memory (RAM) 3
5, input port 35, output port 37, pass line 3
It consists of 9 etc. 0PU29 is the brain part of the microcomputer, consisting of a calculation unit and a control unit.
By the command of the program taken out from ROM31,
Perform arithmetic, logical operations, and other operations on data. For this reason, it instructs and controls the operation of all devices, including peripheral devices, and also follows the control from the peripheral devices. 'f4JOM31 stores the control program for the 0PU29, the accuracy correction processing program for the potentiometer 15, etc., and also stores the initial resistance value of the potentiometer 15 corresponding to the fully open position of the throttle valve 11, the fully open position, etc., respectively, as the set value. I remember. 2. The initial resistance value corresponding to the fully open position is set to a value below the lower limit of the variation resistance value of the potentiometer 15 that detects the fully open position. In addition, the initial resistance value corresponding to the fully open position is
The set value is set to be greater than the upper limit of the variation resistance value of the potentiometer 15 that detects the fully closed position. Throttle valve 11
If the set value of the potentiometer 15 that increases the detected resistance value from the fully closed position to the fully open position is determined in this way, the set value can be updated based on the detected value of the potentiometer 15. , the collusion of the potentiometer 15 is continuously and automatically corrected. 11. AM53 contains input data such as a detected value based on the detection of the potentiometer 15, data of a setting value updated by the detected value, and 0
An output signal from the A/'L') converter 25 is given to the input port 35 on which the calculation data of the PU 29 is transmitted. The output port 37 outputs a throttle valve opening signal S to notify a predetermined location of the operating state of the engine. The pass line 39 is an address bus line, a data bus line/, 1ttlJ for connecting these.
? Including N pass line etc.

In addition, when using a potentiometer that decreases the detection resistance value from the fully closed position to the fully open position of the throttle valve, the initial resistance value corresponding to the fully open position is the lower limit value of the variation resistance value of the potentiometer that detects the fully open position. In addition to setting the following, the initial resistance value corresponding to the fully open position is
Set above the upper limit of the variable resistance value of the potentiometer that detects the fully open position.

Next, the operation of the embodiment '-J of the present invention will be explained.

FIG. 3 is a flowchart of the potentiometer accuracy correction processing program, which is executed by steps I'1""LPH. Ru.

First, at the 3171st P, the opening degree 1:t of the throttle valve 11 is detected by the potentiometer 15, and the A/I
) The detected value is read through the converter 25.

P, the set value at the fully closed position of the throttle valve 11 (
It is determined whether the detected value is smaller than the fully open setting value (hereinafter referred to as the fully open setting value).

If YES, the detected value is smaller than the fully open setting value, so
Go to P to update the fully closed set value with the detected value.

At P3, the cutoff close set value is calculated from the formula: cutoff close set value = old fully closed set value 10k (detected value - old fully closed set value). However, k is a coefficient and is %O (k≦1).

In the case of No, it is determined in P4 whether the detected value is a dog from the set value at the fully open position of the throttle valve 11 (hereinafter referred to as the fully open set value). If YES, the detected value is larger than the fully open set value, so the process goes to P to update the fully open set value with the detected value.

At P, the snap-open setting value is calculated from the formula: snap-open setting value=old full-open setting value 10k·(detected value−old full-open setting value). N
In the case of o, the process ends as is.O After completing such a process, in order to detect the engine operating state and increase the opening (elb) of the throttle valve 11, the throttle valve opening - (detected value - Calculated from the formula: (break-out close setting value)・100/(break-in open setting value - new fully closed setting value).

In addition, as an engine operating state detector that detects the engine operating state from the operating position of the operating device, an accelerator pedal depression amount sensor, a diesel engine injection pump rack position sensor, etc. can also be used. (Effects of the invention) The present invention has the above-described configuration, and automatically corrects the accuracy of the engine operating condition detector, making it easy to adjust the time when installed in one assembly, and to prevent aging such as mechanical wear. Since the accuracy can be maintained, there is no need for maintenance. In addition, since the accuracy is automatically corrected, the tolerance range for product variations is expanded, and costs can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram clearly showing the configuration of the present invention. FIG. 2 is an embodiment diagram of the present invention. FIG. 6 is a flowchart of a potentiometer accuracy correction processing program. DESCRIPTION OF SYMBOLS 11... Operator 15... Engine operating state detector 27... Electronic control device 30... Set value storage means 5
2...Comparison means 34...Setting value updating means Patent applicant Isu, - Jidosha Co., Ltd. Agent Patent attorney Minoru Tsuji
1 other person

Claims (1)

[Claims] an operating device that operates the operating state of the engine, an engine operating state detector that detects the operating state of the engine from the operating position of the operating device, and a set value storage means that stores a set value that corresponds to the operating position of the operating device; Comparing means for detecting the operating position of the operating device and comparing the detected value with a corresponding set value, and set value updating means for updating the set value with the detected value when the comparison result indicates a predetermined relationship. Accuracy correction device for engine operating condition detector.