# US 6,293,249 B1 · Unit for controlling electronically controlled throttle valve

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- Number: US 6,293,249 B1
- Document ID: US6293249B1
- Status: Granted
- Kind: B1
- Application number: 09/369,634
- Filed: 1999-08-06
- Granted: 2001-09-25
- Earliest claimed: 1998-08-10
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Inventors: Ken Kuretake
- Web page: https://patentgrep.com/patent/US6293249B1

## CPC

- F02D 11/10: of the electric type
- F02D 11/105: {characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque}
- F02D 35/0007: {using electrical feedback (F02D35/0015 takes precedence)}
- F02D 2041/1409: {using at least a proportional, integral or derivative controller}
- F02D 2041/1422: {Variable gain or coefficients}
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)

## Abstract

A control unit for detecting an opening of an accelerator and an opening of the throttle valve to operate the throttle valve via a motor, sets a commanded value of an opening of the throttle valve at each of first predetermined cycles in accordance with an of the accelerator. A first opening/closing velocity is set in accordance with the set commanded value, a present opening of the throttle valve is read at each of second cycles shorter than the first predetermined cycles, the motor is rotated to open/close the throttle valve to follow a first predicted opening of the throttle valve until the opening of the throttle valve is smaller than the commanded value by a predetermined quantity, and the motor is caused to open/close the throttle valve to follow a second predicted opening of the throttle valve which is smaller than the first predicted opening of the throttle valve after the cycle when the opening of the throttle valve has been made smaller than the commanded value by a predetermined quantity. As a result, high-speed response of the throttle valve and prevention of overshoot can be realized.

## Claims

### Claim 1

A control unit of an internal combustion engine, the control unit comprising:
an accelerator opening sensor for detecting a value corresponding to an opening of an accelerator in accordance with an amount of depression of an acceleration pedal;
a throttle-valve opening sensor for detecting an opening of a throttle valve disposed in a suction passage of the engine;
a motor for opening and closing the throttle valve in accordance with the value corresponding to the accelerator opening and the value corresponding to the throttle-valve opening;
commanded value setting means for setting a commanded value of the opening of the throttle valve in accordance with the accelerator opening value;
first controlled variable setting means for setting a first controlled variable of the throttle valve in accordance with the commanded value;
second controlled variable setting means for setting a second controlled variable in accordance with the first controlled variable of the throttle valve when the difference between a present opening of the throttle valve and a previous opening of the throttle valve is smaller than a predetermined value; and
controlled variable output means for outputting the first and second controlled variables to the motor for opening the throttle valve until the opening reaches the commanded value.

### Claim 2 (depends on 1)

A control unit according to claim 1, wherein the second controlled-variable setting means reads a value detected by the throttle-valve opening sensor as a present opening of the throttle valve at second cycles shorter than the first cycles, stores the opening of the throttle valve with a reading time, calculates the deviation between the stored previous opening of the throttle valve and the present opening of the throttle valve and compares the deviation to a reference value.

### Claim 3 (depends on 2)

A control unit according to claim 2, wherein the second controlled-variable setting means calculates a predicted correction term in accordance with the deviation when the deviation between the previous opening of the throttle valve and the present opening of the throttle valve is at least as small as a reference value, corrects the first controlled variable with the predicted correction term and instructs the controlled-variable output means.

### Claim 4 (depends on 3)

A control unit according to claim 3, wherein the first and second controlled-variable output means calculate a duty ratio of electric power supplied to the motor in accordance with the first and second predicted openings of the throttle valve and instruct the motor to rotate in accordance with the calculated duty ratio.