Rotation detector and steering system
AssigneeDenso Corporation
InventorsHaruo Suzuki, Nobuyori Nakajima, Koichi Nakamura, Go Endoh, Atsuko Oka, Takashi Suzuki, Yosuke Ogi, Shuji Kuramitsu
Life of this patent
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Abstract
A rotation detector has a first controller that monitors abnormality of a rotation number calculated by a rotation number calculator based on the calculated rotation number and a preset rotation angle. The first controller in a first system is configured to output rotation information calculated by a second controller in a second system upon having determination that the rotation number of the first system has abnormality, for a continuation of the rotation information calculation.
Claims13
A rotation detector, comprising:
- a first detector including:
- (i) rotation number calculator configured to calculate a rotation number based on an output value from a main sensor element that detects a rotation of a detection target,
- wherein a preset rotation angle is less than 360 degrees,
- wherein one full rotation of 360 degrees is divided by the preset rotation angle to yield an integer number of segments,
- wherein the rotation number indicates how many segments have been detected during the rotation of the detection target;
- and
- (ii) an angle calculator configured to calculate a rotation angle of the detection target based on the output value from the main sensor element,
- wherein the rotation angle is less than 360 degrees;
- and
- a first controller configured to:
- (i) calculate an estimated number based on the rotation angle;
- (ii) calculate a normalization value equal to a modulus of the rotation number based on the integer number;
- and
- (iii) determine that a modulus abnormality occurred when the estimated number does not equal the normalization value.
A steering system, comprising:
- a rotation detector including:
- a first detector including:
- (i) rotation number calculator configured to calculate a rotation number based on an output value from a main sensor element that detects a rotation of a detection target,
- wherein a preset rotation angle is less than 360 degrees,
- wherein one full rotation of 360 degrees is divided by the preset rotation angle to yield an integer number of segments,
- wherein the rotation number indicates how many segments have been detected during the rotation of the detection target;
- and
- (ii) an angle calculator configured to calculate a rotation angle of the detection target based on the output value from the main sensor element,
- wherein the rotation angle is less than 360 degrees;
- and
- a first controller configured to:
- (i) calculate an estimated number based on the rotation angle;
- (ii) calculate a normalization value equal to a modulus of the rotation number based on the integer number;
- and
- (iii) determine that a modulus abnormality occurred when the estimated number does not equal the normalization value,
- wherein
- a steering device is provided for receiving a steering operation of a driver of a vehicle;
- a tire turning device is provided for turning a direction of a tire of the vehicle, wherein
- the steering device has, as a detection target, a reaction force motor for applying a reaction force to a steering wheel according to the steering operation of the driver,
- the tire turning device has, as a detection target, a turning motor for providing a tire turning force to the tire turning device, and
- the rotation detector is implemented as (i) a turning detector for detecting the rotation number of the turning motor and (ii) a reaction force detector for detecting the rotation number of the reaction force motor.
Dependencies are inferred from the claim text.