Patent ID: 8301324
Filing Date: 2012-10-30
Classification: B60L,G01P,Y02T,Y10T

Abstract:
1. A vehicle comprising: an electric traction motor; a transmission which is selectively powered by the traction motor to thereby propel the vehicle in an electric-vehicle (EV) operating mode; a speed encoder configured to measure a rotational speed of the traction motor, and to transmit the measured rotational speed as an encoder signal; and a control system configured to compensate for angular wobble in the encoder signal, the control system including a hybrid control processor (HCP) and a motor control processor (MCP), wherein the HCP coordinates, at a first hierarchical level, inputs to the transmission based on the current hybrid operating strategy, and, and wherein the MCP controls an operation of the traction motor, at a second hierarchical level that is lower than that of the first hierarchical level, using a set of input signals, wherein the control system is further configured to: receive, via the HCP, the encoder signal directly from the speed encoder; determine a set of wobble characteristics of the encoder signal only when the measured rotational speed is below a threshold motor speed; calculate a wobble-compensated speed value, solely via the HCP, using the set of wobble characteristics; transmit the wobble-compensated speed value to the MCP; and use the wobble-compensated speed value as at least part of the input signals when controlling the motor via the MCP.