Vehicle abnormality diagnosis device

The abnormality diagnosis device in hybrid vehicles estimates motor coil temperature from oil temperature to determine oil sufficiency, addressing the cost-ineffectiveness of direct sensing and preventing part seizure by alerting occupants.

JP7647160B2Active Publication Date: 2025-03-18TOYOTA JIDOSHA KK
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Patent Information

Application Number
JP2021027702
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-02-24
Publication Date
2025-03-18
Estimated Expiration
2041-02-24

AI Technical Summary

Technical Problem

In hybrid vehicles with transaxles that do not have hydraulic equipment operated by oil, occupants may not realize that the oil level is insufficient until parts seize, making direct oil level sensing cost-ineffective.

Method used

An abnormality diagnosis device that estimates the motor coil temperature based on the oil temperature within the transaxle and determines if the oil level is insufficient by comparing the measured coil temperature to the estimated value, using a preset determination value.

Benefits of technology

Enables the detection of insufficient oil in the transaxle without direct oil measurement, improving cost-effectiveness and preventing part seizure by alerting occupants through a warning light.

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Abstract

To enable whether or not oil in a trans axle gets low to be confirmed without installing means to directly confirm an oil amount.SOLUTION: An abnormality diagnostic device 40 estimates a coil temperature of a first generator motor in a trans axle on the basis of a measurement of an oil temperature T4 in the trans axle. Then, the abnormality diagnostic device 40 determines that oil in the trans axle gets low when a difference between the measurement of the coil temperature and the estimated coil temperature is equal to or larger than a determination value.SELECTED DRAWING: Figure 2
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