Method of estimating temperature and device for the effecting same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMitsuhiro Nada
Life of this patent
Estimating the term…
Abstract
In accordance with the presence or absence of heat, a transistor shows a relatively rapid change, while a cooling water CLW shows a relatively gentle change. The temperatures of both members settle down to approximately equal temperatures when no heat is generated in the transistor. At this time, the temperature of one of the transistor or the cooling water and the amount of energization of the transistor are used to estimate the temperature of the other member. This method is applied to other temperature estimations, such as estimation of the temperature between a stator coil and a stator iron core of a motor etc.
Claims8
A method of estimating a temperature and detecting an abnormality, comprising the steps of:
- (a) specifying a first object;
- (b) specifying an energizable second object that generates heat upon an energization thereof, wherein said second object exhibits a temperature change in response to heat which is more rapid than a temperature change of the first object in response to heat, and wherein said second object is positioned in the vicinity of the first object for exchanging heat therebetween such that said second object assumes a temperature approximately equal to that of the first object in the absence of heat generation therein;
- (c) measuring the temperature of one of the first and second objects by a temperature detector;
- (d) estimating the temperature of the other of the first and second objects using a first method in which the temperature of the other of the first and second objects is estimated on the basis of the temperature measured in the step (c) and a specific value that substantially indicates the amount of the energization of the second object;
- (e) estimating the temperature of the other of the first and second objects using a second method which is different from said first method;
- and (f) detecting an abnormality of at least one of the detector, a system for the first object and a system for the second object based on the temperature estimated by the first method and the temperature estimated by the second method.
A temperature estimation device for estimating a temperature of one of first and the second objects from the temperature of the other object, and for detecting an abnormality, comprising:
- a temperature measuring portion for measuring the temperature of one of the first and second objects by a temperature detector;
- and
- an estimation portion for estimating the temperature of the other of the first and second objects using a first method in which the temperature of the other of the first and second objects is estimated on the basis of the temperature measured by the temperature determination portion and a specific value substantially indicating the amount of energization of the second object, for estimating the temperature of the other of the first and second objects using a second method which is different from said first method, and for detecting an abnormality of at least one of the detector, a system for the first object and a system for the second object based on the temperature estimated by the first method and the temperature estimated by the second method,
- wherein the second object is an energizable object that generates heat upon an energization thereof, wherein said second object exhibits a temperature change in response to heat which is more rapid than a temperature change of the first object in response to heat, and
- wherein said second object is positioned in the vicinity of the first object for exchanging heat therebetween such that said second object assumes a temperature approximately equal to that of the first object in the absence of heat generation therein.
Dependencies are inferred from the claim text.