FIG. 14 shows a typical map of battery voltage against battery current limit which can be used to populate an appropriate lookup table for use by the block of FIG. 6;
FIG. 15 is a sample plot of battery current over time showing the ideal current limit and overshoot due to inaccuracies in the model used in FIGS. 7 and 8 leading to charge accumulation;
FIG. 16 is a plot of torque demand limit covering all four quadrants of the motor operation;
FIG. 17 illustrates the current gradient showing both an unacceptable (NOK) high gradient and an acceptable (OK) lower gradient, and also an intermediate gradient which is OK due to the short duration;
FIG. 18 is a more refined plot corresponding to FIG. 17 showing how the traces are not smooth and lead to short spikes of increased gradient; and
FIG. 19 is a block diagram showing the function of and optional charge limiting part of the motor control circuit; and
FIG. 20 shows an alternative arrangement of an apparatus.
DETAILED DESCRIPTION
The following example describes an embodiment of the present disclosure used in an automotive application although the reader will understand that the present disclosure should not be limited in scope to such an application.
