Rotation detecting device and rotation detecting method

1. A rotation detecting device for determining normal rotation and reverse rotation of a rotating shaft of a vehicle, comprising:

an output unit for generating a rotation signal output in response to rotation of the rotating shaft of a vehicle, the rotation signal being different between the normal rotation and the reverse rotation of the rotating shaft;

a first determination unit for determining whether the rotating shaft is rotated in one of the normal direction and the reverse direction based on an operating condition of the vehicle;

a setting unit for setting a threshold value which determines whether the rotation signal indicates the normal rotation or the reverse rotation based on a determined rotating direction and the rotation signal;

a second determination unit for determining the normal rotation and reverse rotation of the rotating shaft based on the rotation signal and the threshold value;

wherein the rotating shaft is an output shaft of an internal combustion engine;

wherein the first determination unit determines whether or not the output shaft is rotating normally based on at least one of engine rotating speed, a cylinder in which a piston is in a predetermined position, an engine load, a starting operating state, intake pressure, and battery voltage; and

wherein the first determination unit determines that the output shaft is rotating normally when an updating order of the cylinder of which piston position is determined to be in the predetermined position is normal.

2. The rotation detecting device according to claim 1 further comprising:

a detection unit for detecting a stop position of the internal combustion engine based on the normal rotation/reverse rotation of the output shaft determined by the second determination unit;

a diagnostic unit for determining whether or not the threshold value set by the setting unit is abnormal; and

an output control unit for invalidating the stop position detected by the detection unit when the diagnostic unit determines that the threshold value is abnormal.

3. The rotation detecting device according to claim 1 ,

wherein the rotation signal is a pulse signal output at every unit rotation angle of the rotating shaft and has a pulse width different between the normal rotation and the reverse rotation of the rotating shaft, and

the second determination unit measures the pulse width of the rotation signal and determines the normal rotation/reverse rotation of the rotating shaft based on whether or not the measured pulse width is greater than the threshold value.

4. A rotation detecting device for determining normal rotation and reverse rotation of a rotating shaft of a vehicle, comprising:

an output unit for generating a rotation signal output in response to rotation of the rotating shaft of a vehicle, the rotation signal being different between the normal rotation and the reverse rotation of the rotating shaft;

a first determination unit for determining whether the rotating shaft is rotated in one of the normal direction and the reverse direction based on an operating condition of the vehicle;

a setting unit for setting a threshold value which determines whether the rotation signal indicates the normal rotation or the reverse rotation based on a determined rotating direction and the rotation signal;

a second determination unit for determining the normal rotation and reverse rotation of the rotating shaft based on the rotation signal and the threshold value;

wherein the rotating shaft is an output shaft of an internal combustion engine;

wherein the first determination unit determines whether or not the output shaft is rotating normally based on at least one of engine rotating speed, a cylinder in which a piston is in a predetermined position, an engine load, a starting operating state, intake pressure, and battery voltage; and

wherein the first determination unit determines that the output shaft is rotating normally when the engine load has increased.

5. The rotation detecting device according to claim 4 , further comprising:

a detection unit for detecting a stop position of the internal combustion engine based on the normal rotation/reverse rotation of the output shaft determined by the second determination unit;

a diagnostic unit for determining whether or not the threshold value set by the setting unit is abnormal; and

an output control unit for invalidating the stop position detected by the detection unit when the diagnostic unit determines that the threshold value is abnormal.

6. The rotation detecting device according to claim 4 ,

wherein the rotation signal is a pulse signal output at every unit rotation angle of the rotating shaft and has a pulse width different between the normal rotation and the reverse rotation of the rotating shaft; and

the second determination unit measures the pulse width of the rotation signal and determines the normal rotation/reverse rotation of the rotating shaft based on whether or not the measured pulse width is greater than the threshold value.

7. A rotation detecting device for determining normal rotation and reverse rotation of a rotating shaft of a vehicle, comprising:

an output unit for generating a rotation signal output in response to rotation of the rotating shaft of a vehicle, the rotation signal being different between the normal rotation and the reverse rotation of the rotating shaft;

a first determination unit for determining whether the rotating shaft is rotated in one of the normal direction and the reverse direction based on an operating condition of the vehicle;

a setting unit for setting a threshold value which determines whether the rotation signal indicates the normal rotation or the reverse rotation based on a determined rotating direction and the rotation signal;

a second determination unit for determining the normal rotation and reverse rotation of the rotating shaft based on the rotation signal and the threshold value;

wherein the rotating shaft is an output shaft of an internal combustion engine;

wherein the first determination unit determines whether or not the output shaft is rotating normally based on at least one of engine rotating speed, a cylinder in which a piston is in a predetermined position, an engine load, a starting operating state, intake pressure, and battery voltage; and

wherein the first determination unit determines that the output shaft is rotating normally when it is in the starting operating state of the internal combustion engine.

8. The rotation detecting device according to claim 7 , further comprising:

a detection unit for detecting a stop position of the internal combustion engine based on the normal rotation/reverse rotation of the output shaft determined by the second determination unit;

a diagnostic unit for determining whether or not the threshold value set by the setting unit is abnormal; and

an output control unit for invalidating the stop position detected by the detection unit when the diagnostic unit determines that the threshold value is abnormal.

9. The rotation detecting device according to claim 7 ,

wherein the rotation signal is a pulse signal output at every unit rotation angle of the rotating shaft and has a pulse width different between the normal rotation and the reverse rotation of the rotating shaft; and

the second determination unit measures the pulse width of the rotation signal and determines the normal rotation/reverse rotation of the rotating shaft based on whether or not the measured pulse width is greater than the threshold value.

10. A rotation detecting device for determining normal rotation and reverse rotation of a rotating shaft of a vehicle, comprising:

an output unit for generating a rotation signal output in response to rotation of the rotating shaft of a vehicle, the rotation signal being different between the normal rotation and the reverse rotation of the rotating shaft;

a first determination unit for determining whether the rotating shaft is rotated in one of the normal direction and the reverse direction based on an operating condition of the vehicle;

a setting unit for setting a threshold value which determines whether the rotation signal indicates the normal rotation or the reverse rotation based on a determined rotating direction and the rotation signal;

a second determination unit for determining the normal rotation and reverse rotation of the rotating shaft based on the rotation signal and the threshold value;

wherein the rotating shaft is an output shaft of an internal combustion engine;

wherein the first determination unit determines whether or not the output shaft is rotating normally based on at least one of engine rotating speed, a cylinder in which a piston is in a predetermined position, an engine load, a starting operating state, intake pressure, and battery voltage; and

wherein the first determination unit determines that the output shaft is rotating normally when the intake pressure of the internal combustion engine has increased or reduced a predetermined value from atmospheric pressure.

11. The rotation detecting device according to claim 10 , further comprising:

a detection unit for detecting a stop position of the internal combustion engine based on the normal rotation/reverse rotation of the output shaft determined by the second determination unit;

a diagnostic unit for determining whether or not the threshold value set by the setting unit is abnormal; and

an output control unit for invalidating the stop position detected by the detection unit when the diagnostic unit determines that the threshold value is abnormal.

12. The rotation detecting device according to claim 10 ,

wherein the rotation signal is a pulse signal output at every unit rotation angle of the rotating shaft and has a pulse width different between the normal rotation and the reverse rotation of the rotating shaft; and

the second determination unit measures the pulse width of the rotation signal and determines the normal rotation/reverse rotation of the rotating shaft based on whether or not the measured pulse width is greater than the threshold value.

13. A rotation detecting device for determining normal rotation and reverse rotation of a rotating shaft of a vehicle, comprising:

an output unit for generating a rotation signal output in response to rotation of the rotating shaft of a vehicle, the rotation signal being different between the normal rotation and the reverse rotation of the rotating shaft;

a first determination unit for determining whether the rotating shaft is rotated in one of the normal direction and the reverse direction based on an operating condition of the vehicle;

a setting unit for setting a threshold value which determines whether the rotation signal indicates the normal rotation or the reverse rotation based on a determined rotating direction and the rotation signal;

a second determination unit for determining the normal rotation and reverse rotation of the rotating shaft based on the rotation signal and the threshold value;

wherein the rotating shaft is an output shaft of an internal combustion engine;

wherein the first determination unit determines whether or not the output shaft is rotating normally based on at least one of engine rotating speed, a cylinder in which a piston is in a predetermined position, an engine load, a starting operating state, intake pressure, and battery voltage; and

wherein the first determination unit determines that the output shaft is rotating normally when the voltage of a battery provided to the internal combustion engine has increased.

14. The rotation detecting device according to claim 13 , further comprising:

a detection unit for detecting a stop position of the internal combustion engine based on the normal rotation/reverse rotation of the output shaft determined by the second determination unit;

a diagnostic unit for determining whether or not the threshold value set by the setting unit is abnormal; and

an output control unit for invalidating the stop position detected by the detection unit when the diagnostic unit determines that the threshold value is abnormal.

15. The rotation detecting device according to claim 13 ,

wherein the rotation signal is a pulse signal output at every unit rotation angle of the rotating shaft and has a pulse width different between the normal rotation and the reverse rotation of the rotating shaft; and

the second determination unit measures the pulse width of the rotation signal and determines the normal rotation/reverse rotation of the rotating shaft based on whether or not the measured pulse width is greater than the threshold value.

16. A rotation detecting method for determining normal rotation and reverse rotation of a rotating shaft of a vehicle, comprising the steps of:

inputting a rotation signal output as the rotating shaft rotates, the rotation signal being different between the normal rotation and the reverse rotation of the rotating shaft of the vehicle;

determining whether the rotating shaft is rotated in one of a normal direction and a reverse direction based on an operating condition of the vehicle;

setting a threshold value which determines whether the rotation signal indicates the normal rotation or the reverse rotation based on a determined rotating direction and the rotation signal;

determining the normal rotation and the reverse rotation of the rotating shaft based on the rotation signal and the threshold value;

wherein the rotating shaft is an output shaft of an internal combustion engine, and

the step of determining whether the rotating shaft is rotated in one of the normal direction and the reverse direction, includes the following steps of:

detecting at least one of engine rotating speed, a cylinder in which a piston is in a predetermined position, an engine load, a starting operating state, intake pressure, and battery voltage as an operating condition of the internal combustion engine;

determining whether or not the output shaft is rotating normally based on the operating condition; and

wherein the step of detecting the operating condition detects the cylinder in which the piston is in the predetermined position; and

the step of determining whether or not the output shaft is rotating normally determines that the output shaft is rotating normally when an updating order of the cylinder of which piston position is determined to be in the predetermined position is normal.

17. The rotation detecting method according to claim 16 further comprising the steps of:

detecting a stop position of the internal combustion engine based on the normal rotation and the reverse rotation of the output shaft;

determining whether or not the threshold value is abnormal; and

invalidating the stop position when it is determined that the threshold value is abnormal.