Testing apparatus for engine driven automotive component with feature of precise simulation of engine transition state

A bench testing apparatus for a vehicular component associated with an automotive internal combustion engine, comprising:

• a power plant which incorporates a relatively high inertia, and means for compensating a high inertia for achieving a low inertia equivalent to the automotive internal combustion engine, said power plant being drivingly connected to said vehicular component to be tested for supplying a driving torque;
• an engine characteristics generator receiving predetermined engine operation parameter simulated data for deriving a control signal to be output to the input axle of the vehicular component according to a predetermined engine output torque variation characteristic which is set in terms of said engine operation parameter simulated data;
• and
• means, cooperative with said engine characteristics generator and responsive to a torque variation command demanding said output torque from a first value to a second value, for determining a transient characteristic of the vehicular component according to the output torque value from said power plant and a torque derived at an output axle of the specimen.

A simulation system of a vehicular internal combustion engine, the simulation system being associated with an automatic power transmission to be tested, comprising:

• a low inertia drive unit having a low inertia force and substantially equivalent to the internal combustion engine characteristics, the low inertia driving unit being connected to an input axle of the automatic power transmission;
• first means for detecting an revolution speed (N1) of an output axle of the low inertia driving unit;
• second means for detecting a torque (T1) of the input axle of the automatic power transmission;
• an engine characteristic generator for deriving a torque command according to the revolution speed (N1) and the torque of the input axle of the automatic power transmission;
• third means for supplying a corrected torque command to the engine characteristic generator, the torque command derived therefrom being corrected from the torque command derived from the engine characteristic generator by adding or subtracting a corrective torque signal having an arbitrarily set quantity and having an arbitrary timing to or from the torque command;
• and
• drive absorbing means which simulates an output load of the automatic power transmission.