Patent ID: 11946773
Assignee: DENSO CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. A control unit comprising:
a detection device having:
a multi-turn detection unit configured to continue detection of a rotation position of multiple rotations of a detection object without supply of electric power from outside;
a position detector configured to detect a rotation position in one rotation of the detection object;
a multiple rotation position calculator configured to calculate multiple rotation position information related to the rotation position of multiple rotations based on a detection value of the multi-turn detection unit, the multiple rotation position information being a count value that divides one rotation by an integer of 1 or more; and
an angle calculator configured to calculate rotation angle information related to the rotation position in one rotation based on a detection value of the position detector; and

a controller configured to obtain information related to a rotation of the detection object from the detection device, wherein
the detection device or the controller includes an absolute position calculator calculating an absolute position as a displacement amount from a reference position based on the multiple rotation position information and the rotation angle,
the multiple rotation position information is a count value either counted up or down according to a rotation direction by a number of n, where n is the integer of 1 or more, in one rotation of the detection object, and
the multiple rotation position calculator is configured to count the count value as a number m between an upper limit value and a lower limit value, where m is an integer of 2n or more, and, upon having the count value reaching the upper limit value, count up the count value to the lower limit value in a subsequent count up and, upon having the count value reaching the lower limit value, count down the count value to the upper limit value in a subsequent count down,
the detection device further includes, in the multiple rotation position calculator,
a first multiple rotation position calculator configured to calculate the multiple rotation position information based on a detection value of the multi-turn detection unit, and
a second multiple rotation position calculator configured to calculate the multiple rotation position information based on a detection value of the position detector,
wherein the first multiple rotation position calculator and the second multiple rotation position calculator are provided as a heterogeneously-redundant configuration for the calculation of the multiple rotation information, and
electric power is constantly supplied to the position detector and the second multiple rotation position calculator respectively providing a detection value for the calculation of the multiple rotation position information.