This thesis considers the feasibility or replacing a series
of diesel engines, which are used in starter-motor endurance tests,
by an electrical loading system whose torque-characteristics are
similar to those or a given individual engine. The torque-characteristics
of diesel engines and starter-motors are briefly examined to
indicate the problems associated with their simulation. The
simulating system finally evolved is based on a static-switching current regulator
and useful contributions are made towards both the physical
realisation or suitable circuit-techniques and the general analysis and
operation or switching-mode circuits or this kind. Special consideration
is given to the problems or rapid and periodic reversal or the regulator output-
current, and a static-logic system is evolved that provides this
Some practicable and novel methods or generating high-frequency
functions are presented for the production or torque/crank-angle waveforms
for a range of engine-parameters, and proposals are made for the
electrical simulation or the engine-inertia. The effects of this latter
function upon the system torque requirements and the validity or the
overall simulation are then examined in detail.
It is concluded that an electrical simulation is possible by
use or the techniques suggested, although some complexity is unavoidable
if high accuracy and performance are to be achieved.
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.