Method for setting sensor output

Patent metadata

Field	Value
Publication number	US-9458777-B2
Application number	US-201314074827-A
Country	US
Kind code	B2
Filing date	Nov 8, 2013
Priority date	Jan 18, 2013
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A valve is configured to control an opening in a passage. A valve angle sensor is configured to send an electric signal according to a rotation angle of the valve. In a storing process, an actual measurement value of a valve angle at a mechanical full open position is stored as an actual full open valve angle. In a first setting process, a first output value at a mechanical full close position is set. In a second setting process, a second output value at the stored actual full open valve angle is set. The output characteristic is set as an angle to output value relation according to the first output value and the second output value.

First claim

What is claimed is:

1. A method for setting an output characteristic of a valve angle sensor of a valve device, the valve device including a valve and the valve angle sensor, the valve configured to control an opening in a passage, the valve angle sensor configured to send an electric signal according to a rotation angle of the valve, the method comprising:
storing, in a storing process, an actual measurement value of a valve angle in a mechanical full open position, which is a full open position in a mechanical configuration, as an actual full open valve angle;
setting, in a first setting process, an output value in a mechanical full close position, which is a full close position in the mechanical configuration; and
setting, in a second setting process, an output value at the actual full open valve angle, which is stored in the storing process, wherein
the output characteristic is set as an angle to output value relation according to the output value, which is set in the first setting process, and the output value, which is set in the second setting process, the method further comprising
implementing linear interpolation between the output value in the mechanical full close position and an ideal output value when the valve angle is at an ideal valve angle, which is different from the actual measurement value, to obtain the angle to output value relation as an ideal characteristic, wherein
in the second setting process, the output value is set at the actual full open valve angle on the ideal characteristic.

2. The method according to claim 1 , wherein
the valve device further includes a driven valve, which is rotatable via a linkage mechanism in conjunction with rotation of the valve and configured to control an opening of a passage, which is different from the passage, which the valve controls the opening.

3. The method according to claim 2 , wherein
the valve device is employed in an internal combustion engine, which is equipped with a turbocharger in an intake and exhaust system,
the valve is a low-pressure EGR valve configured to receive a part of exhaust gas as low-pressure EGR gas from an exhaust passage, which is downstream from an exhaust turbine of the turbocharger, and to control an opening of a low-pressure EGR passage to reflux the low-pressure EGR gas into the intake passage upstream from a compressor of the turbocharger, and
the driven valve is a throttle valve configured to throttle one of the exhaust passage and the intake passage to increase a flow quantity of the low-pressure EGR gas in the low-pressure EGR passage.

4. The method according to claim 2 , wherein an opening position of the driven valve is configured to change non-linearly relative to change in an opening position of the valve.

5. The method according to claim 1 , further comprising:
obtaining, in an obtaining process, the actual measurement value.

6. The method according to claim 5 , further comprising:
the first setting process and the second setting process are implemented by using an external setting device, and
the obtaining process is implemented by a detection device other than the external setting device.

7. The method according to claim 1 , wherein
the valve is one of a throttle valve and an EGR valve.

8. A method for setting an output characteristic of a valve angle sensor, the valve angle sensor configured to send an electric signal according to a rotation angle of a valve, the valve rotatable to control an opening in a passage, the method comprising:
storing, as an actual full open valve angle, an actual measurement value of the rotation angle when the valve is in a mechanical full open position, the mechanical full open position being a full open position of the valve in a mechanical configuration of the valve;
first setting a first output value of the valve angle sensor when the valve is in a mechanical full close position, the mechanical full close position being a full close position of the valve in the mechanical configuration; and
second setting a second output value of the valve angle sensor when the valve is at the actual full open valve angle, which is stored, wherein
the output characteristic is set as an angle to output value relation according to the first output value and the second output value, wherein
in the second setting, the second output value is set on a linear characteristic between the first output value and an ideal output value, wherein
the ideal output value is when the valve is at an ideal valve angle, which is different from the actual measurement value.

9. The method according to claim 8 , wherein the angle to output value relation represents a relation between
a first point, at which the first output value is set to the valve angle sensor when the valve is in the mechanical full close position, and
a second point, at which the second output value is set to the valve angle sensor when the valve is at the actual full open valve angle.

10. The method according to claim 8 , wherein
the valve is one of a throttle valve and an EGR valve.

11. A method for setting an output characteristic of a valve angle sensor of a valve device, the valve device including a valve and the valve angle sensor, the valve configured to control an opening in a passage, the valve angle sensor configured to send an electric signal according to a rotation angle of the valve, the method comprising:
obtaining, in an obtaining process, an actual measurement value of a valve angle in a mechanical full open position, which is a full open position in a mechanical configuration, as an actual full open valve angle;
storing, in a storing process, the actual measurement value;
setting, in a first setting process, a mechanical-full-close output value in a mechanical full close position, which is a full close position in the mechanical configuration; and
setting, in a second setting process, a mechanical-full-open output value at the actual full open valve angle, which is stored in the storing process, on an ideal characteristic, wherein
the ideal characteristic is an angle to output value relation obtained by linear interpolation between the mechanical-full-close output value at the mechanical full close position and an ideal output value when the valve angle is at an ideal valve angle, which is different from the actual measurement value.

12. The method according to claim 11 , further comprising:
the first setting process and the second setting process are implemented by using an external setting device, and
the obtaining process is implemented by a detection device other than the external setting device.

13. The method according to claim 11 , wherein
the valve is one of a throttle valve and an EGR valve.

Assignees

• Denso Corp

Inventors

• Inagaki Noriyuki
• Miyazaki Shinsuke
• Hashimoto Koji
• Moritani Yuichiro

Classifications

• F02D41/2464

  Characteristics of actuators · CPC title

• F02M26/64

  the EGR valve being operated together with an intake air throttle · CPC title

• Y02T10/47

  Cross-Sectional Technologies · mapped topic

• F02M26/25

  with coolers having bypasses · CPC title

• F02D41/0077 Primary

  Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position (EGR valve position sensor F02M26/48) · CPC title