| 摘要 |
<p>An electric motor controller comprises: a health indicator 18 providing an output signal to indicate operation of a power provider such as inverter 16; a failsafe 20 that receives a health indicator signal from another electric motor controller, and a controller 12 that controls operation of power provider 16 based on the indicator signal from said other electric motor controller. The controller may only activate the inverter if an indicator signal is received in response to a parameter of the signal such as its voltage level, frequency, phase amplitude and duty cycle. The health indicator signal may be a square wave and only provided if the motor controller is operating safely, which can include that controller components are operating and a signal from another component is consistent with safe vehicle operation. The health indicator signal can be based on operational parameters of the controller such as the direction of DC currents of the controller or another controller; a key switch voltage; temperature of inverter power transistors or the controller; and speed and resolver measurements. The power supply to a first electric traction motor may be controlled based on a comparison of the drive direction the motor controller with the drive direction of a second motor controller. The drive direction may be sensed by sensing the direction of the supply current to each controller.</p> |
