Apparatus for estimating clutch temperature
AssigneeNissan Motor Co., Ltd.
InventorsNorio Iida, Yoshiyuki Fukuda, Hirotaka Kusukawa, Atsuhiko Gotou, Shigeo Murata, Satoshi Mizuya
Life of this patent
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Abstract
The present invention provides an apparatus for estimating clutch temperature estimates clutch temperatures that closely follow actual clutch temperature without a temperature sensor and at low cost. The apparatus employs method for calculating energy applied to the driving clutch according to the detected rotational speed difference and estimated torque and method for estimating a clutch temperature variation based on the calculated energy and estimating a clutch temperature based on the estimated clutch temperature variation.
Claims13
An apparatus for estimating the temperature of a driving clutch whose engagement including slide engagement is controllable, comprising:
- a clutch speed difference detector detecting a rotational speed difference between input and output shafts of the driving clutch;
- a torque estimator estimating torque transmitted through the driving clutch;
- an energy calculator calculating energy applied to the driving clutch according to the detected rotational speed difference and estimated torque;
- a temperature estimator estimating a clutch temperature variation based on the calculated energy and estimating a clutch temperature based on the estimated clutch temperature variation;
- and
- a determination unit determining whether or not the calculated energy is equal to or above a reference energy level, wherein
- if the calculated energy is determined to be equal to or above the reference energy level, the temperature estimator increases the estimated clutch temperature by an increment, and if the calculated energy is determined to be below the reference energy level, the temperature estimator decreases the estimated clutch temperature by a decrement.
An apparatus for estimating the temperature of a driving clutch whose engagement including slide engagement is controllable, comprising:
- clutch speed difference detecting means for detecting a rotational speed difference between input and output shafts of the driving clutch;
- torque estimating means for estimating torque transmitted through the driving clutch;
- energy calculating means for calculating energy applied to the driving clutch according to the detected rotational speed difference and estimated torque;
- temperature estimating means for estimating a clutch temperature variation based on the calculated energy and estimating a clutch temperature based on the estimated clutch temperature variation;
- and
- determining means for determining whether or not the calculated energy is equal to or above a reference energy level, wherein
- if the calculated energy is determined to be equal to or above the reference energy level, the temperature estimating means increases the estimated clutch temperature by an increment, and if the calculated energy is determined to be below the reference energy level, the temperature estimating means decreases the estimated clutch temperature by a decrement.
A method of estimating the temperature of a driving clutch whose engagement including slide engagement is controllable, comprising:
- detecting a rotational speed difference between input and output shafts of the driving clutch;
- estimating torque transmitted through the driving clutch;
- calculating energy applied to the driving clutch according to the detected rotational speed difference and estimated torque;
- estimating a clutch temperature variation based on the calculated energy and estimating a clutch temperature based on the estimated clutch temperature variation;
- and
- determining whether or not the calculated energy is equal to or above a reference energy level, wherein
- if the calculated energy is determined to be equal to or above the reference energy level, the clutch temperature estimating operation increases the estimated clutch temperature by an increment, and if the calculated energy is determined to be below the reference energy level, the clutch temperature estimating operation decreases the estimated clutch temperature by a decrement.
Dependencies are inferred from the claim text.