A low temperature cold start control method based on high frequency injection

By employing a high-frequency injection-based low-temperature cold start control method, utilizing a sliding diaphragm observer and high-frequency current heating, the problem of insufficient start-up reliability of electromechanical-hydraulic systems in low-temperature environments is solved, achieving rapid and reliable cold start and synergistic heating, thereby improving system efficiency.

CN121124643BActive Publication Date: 2026-08-18HUNAN UNIV
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Patent Information

Application Number
CN202511102698.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-08-07
Publication Date
2026-08-18
Estimated Expiration
2045-08-07

AI Technical Summary

Technical Problem

Electromechanical-hydraulic systems have insufficient reliability in low-temperature environments. Existing heating methods suffer from problems such as false triggering of overcurrent protection, slow preheating speed, and inability to coordinate and optimize the overall system, leading to startup failure and reduced efficiency.

Method used

A low-temperature cold start control method using high-frequency injection is adopted. The motor status is monitored by a sliding diaphragm observer algorithm, the oil viscosity is analyzed, and copper and iron losses are generated by high-frequency current injection. The current frequency and amplitude are dynamically adjusted to achieve coordinated heating of the electromechanical-hydraulic system.

Benefits of technology

It improves the starting reliability and response speed of electromechanical-hydraulic systems in low-temperature environments, enabling fast and reliable cold starts and reducing additional losses during normal operation.

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Abstract

The application relates to the technical field of mechatronic systems, and particularly discloses a low-temperature cold start control method based on high-frequency injection, which comprises the following steps: analyzing the motor state, observing and feedforward compensating the disturbance caused by the load torque and the viscous coefficient to the motor state through a sliding mode observer algorithm; obtaining a state equation according to the motor state, constructing an extended sliding mode observer equation, deriving an observer error equation, and observing the load torque; analyzing the obtained load torque, and reflecting the oil viscosity through the motor load torque; injecting high-frequency current under the low-temperature state according to the oil viscosity result, controlling the injection frequency, enhancing the skin effect, controlling the current amplitude, utilizing the copper loss and the high-frequency magnetic field eddy current effect to assist heat generation, gradually reducing the injection voltage amplitude according to the final oil viscosity result, the electromagnetic heat generation viscosity and the load reduction, and switching to normal id=0 control after reaching the normal start condition.
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