Patent ID: 9027344
Filing Date: 2015-05-12
Classification: F02B,F02D,H02P

Abstract:
1. A speed control device for an electric turbocharger which delivers turbocharged-air to an internal combustion engine by a motor driving the electric turbocharger, the speed control device comprising: a temperature sensor configured to detect one of a temperature of a motor winding wire, a temperature of a motor rotation-bearing temperature, an inverter temperature, and a temperature of charging air pressurized by a compressor; a rotational speed sensor configured to detect a rotational speed of the motor; and a controller, including a processing unit, configured to receive input signals from both of the temperature sensor and the rotational speed sensor and limit the rotational speed of the motor when a temperature detected by the temperature sensor exceeds a limit control start temperature, the controller having executable instructions stored on a non-transitory readable medium to execute the steps of: determining an increase rate of the temperature detected by the temperature sensor over time; judging whether the determined increase rate exceeds a predetermined threshold; when the increase rate exceeds the threshold, controlling the rotational speed of the motor of the electric turbocharger in response to the set speed limit to prevent motor operation shutdown.