Hybrid vehicle control device

The control device for a hybrid vehicle addresses the issue of reduced low-temperature startability by adjusting output torque based on lubricating oil temperatures, ensuring consistent engine and motor speeds and enhancing start performance in cold conditions.

JP7647171B2Active Publication Date: 2025-03-18TOYOTA JIDOSHA KK
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Patent Information

Application Number
JP2021031580
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2021-03-01
Publication Date
2025-03-18
Estimated Expiration
2041-03-01

AI Technical Summary

Technical Problem

Hybrid vehicles experience reduced low-temperature startability due to increased friction torque caused by high viscosity lubricating oil in the clutch, motor, and automatic transmission, which cannot be compensated by the engine or motor output.

Method used

A control device for a hybrid vehicle that includes a determination unit to assess engine and motor operation, a clutch engagement state, and an acquisition unit to obtain lubricating oil temperatures. A correction unit then adjusts the output torque by increasing it as the oil temperature drops below a threshold, maintaining the torque at a predetermined value when the temperature is lower, and enhancing torque with higher engine and motor speeds.

Benefits of technology

The control device effectively maintains the engine and motor rotational speeds at target idle speeds during low-temperature starts, thereby improving low-temperature startability and preventing engine stall.

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Abstract

To provide a control device of a hybrid vehicle improved in low temperature startability.SOLUTION: A control device of a hybrid vehicle is provided with a motor on a power transmission path between an engine and wheels, is provided with a clutch between the engine and the motor on the power transmission path and is provided with an automatic transmission between the motor on the power transmission path and the wheels. The control device of a hybrid vehicle is equipped with a determining portion that determines whether or not the engine and the motor are being driven and the clutch is in an engaged state, an obtaining portion that obtains the temperature of lubricant in at least one of the motor, the clutch, and the automatic transmission when the determining portion makes a positive determination, and a correcting portion that, when the temperature of the lubricant is less than a threshold value, corrects so as to increase the output torque of at least one of the engine and the motor as compared with a case where the temperature of the lubricant is the threshold or more.SELECTED DRAWING: Figure 3
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