초록 ▼

The large rotational inertia applied to a driveline component during normal driving conditions is simulated in a test stand that contains a component that driveably connects an input motor and an output motor. A computer repetitively executes an algorithm that produces a commanded torque signal whic

The large rotational inertia applied to a driveline component during normal driving conditions is simulated in a test stand that contains a component that driveably connects an input motor and an output motor. A computer repetitively executes an algorithm that produces a commanded torque signal which is supplied as a control signal to the motor drive of one of the electrical motors to produce an output within that motor equal to the commanded torque. The control system applies to the powertrain component under test an inertia that simulates the actual vehicle inertia. The target state of the system, when the vehicle inertia is applied, is completely defined from information known when the component being tested has substantially less inertia applied.

대표청구항 ▼

In a system for testing a component that carries a torque T and driveably connects an input motor and an output motor whose output torque opposes the output torque of the input motor and simulates the effect of a variable virtual inertia, Jvirtual, driven by the component, the method for producing a

In a system for testing a component that carries a torque T and driveably connects an input motor and an output motor whose output torque opposes the output torque of the input motor and simulates the effect of a variable virtual inertia, Jvirtual, driven by the component, the method for producing a torque command for the output motor comprising: applying to the component the torques, Ti and Tm, produced respectively by the input motor and output motor; determining the current angluar acceleration, a, of the component and determining the current torque, Ti, transmitted by the component; determining the magnitude of the inertia, Ji, of the input motor and the magnitude of the virtual inertia; calculating a torque multiplier, ALT, from the relationship ALT=Ji/(Ji+Jvirtual); calculating an acceleration multipler, ALa, from the relationship ALa=(Ji) Jvirtual/(Ji+Jvirtual); calculating a current torque correction, Tcor, from the relationship Tcor=Ala (a)-ALT (T-Tm); calculating a new torque command, Tc, equal to the sum of a previously calculated torque correction and the current torque correction; and transmitting to the output motor an electrical signal representing a new torque command.