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Adaptive Motor Control Method for Transient Dynamometer System Test Disclosure Number: IPCOM000249968D
Publication Date: 2017-May-10
Document File: 3 page(s) / 330K

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The Prior Art Database

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Adaptive Motor Control Method for Transient Dynamometer System Test


A dynamometer test system including the engine, transmission, and one or more dynamometers are

widely used for testing motor vehicle powertrain performance.

The dynamometers used in these tests are often electrical motors with high rotational inertia treating

vehicle as one lumped body. The torque measured at the dynamometer is heavily damped in higher

frequency range.

There are some fast transient events such as gear shift, tip-in, tip-out that require the dynamometer to

follow higher frequency speed and torque load change dynamics. To capture transient phenomena in

higher dynamics frequency range, e.g., 20Hz, low inertia dynamometers are required. The torque load

measured at this dynamometer will have a wider frequency band and can be used to stimulate more

natural frequency modes in vehicle system.

The low inertia dynamometer test system can further enable shifting motor vehicle tests that are

conventionally performed on road to powertrain labs. Instead of running an imposed speed profile, a

high fidelity vehicle and road load real time numerical simulation is coupled with the powertrain

dynamometer to run a predictive test. The high frequency dynamics and numerical accuracy capacity of

this test system can meet fidelity requirements of many vehicle road tests.

Figure 1 Powertrain dynamometer test system coupled with real time simulation

Figure 1 shows an example of basic components in this test system. A physical powertrain including the

engine and transmission are installed with low inertia dynamometer. The powertrain control module

(PCM) is part of the powertrain system to monitor and control system behavior. The low inertia

dynamometer is coupled with the powertrain by drive shaft and with the real time simulation through

the motor controller by torque and speed signals.



Driveline Vehicle




Road load Simulation

Motor Controller Torque Speed Sensor


In order to capture the torsional load change in real time, the dynamometer motor speed need precisely

follow the speed reference calculated from the real time simulation and thus emulate the vehicle and

road load. This requires a high performance motor controller which governs the dynamometer motor

speed precisely. That means the motor controller need be able to track the reference signal stably in a

higher bandwidth.

Traditional motor speed proportional-integrator-derivative (PID) control logic only uses the feedback

speed error information and has a limit to track refere...