A Regenerative Road Load Simulator

Stringer, I A; Bullock, K J

doi:10.4271/845115

Cited by 8 publications

(8 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The zero should lie between the armature pole at -30. 3 rad/s and the origin. If the zero is too close to the pole, the pole and zero will cancel each other, and the desired performance will not be achieved.…”

Section: Kgand) =mentioning

confidence: 99%

See 1 more Smart Citation

Use of Classical Control Techniques to Stabilize the Electrical Dynamics of a Highly Unstable Road Load Simulator

Stringer

Bullock

1991

Proceedings of the Institution of Mechanical Engineers, Part I:

View full text Add to dashboard Cite

The open-loop transfer function of a complex Ward-Leonard dynamometer system was derived from an analysis of the behaviour of the individual components. The resulting model, which was in good agreement with the open-loop performance of the system, was used to simulate the behaviour of the closed-loop system; this indicated that the system would be unstable. Classical control theory was used to analyse the performance of a number of stabilizing control strategies, and root loci plots, Bode diagrams and Nichols charts were used to cissess the resultant performance. A proportional-plus-integral controller combined with lead compensation was predicted to provide acceptable control. The performance of the system with this controller installed was found to satisfy the design requirements of speed of response, limited overshoot and zero steady-state error.

show abstract

Section: Kgand) =mentioning

confidence: 99%

“…A unique double dynamometer was designed to evaluate power transmission systems capable of handling regenerative braking (1). Dynamometer torque and speed needed to be separately controlled by computer inputs which were to be independent functions of time.…”

mentioning

confidence: 99%

Use of Classical Control Techniques to Stabilize the Electrical Dynamics of a Highly Unstable Road Load Simulator

Stringer

Bullock

1991

Proceedings of the Institution of Mechanical Engineers, Part I:

View full text Add to dashboard Cite

show abstract

“…constant constant partial derivative swash plate angle damping ratio angular position of servo-drive gear reduction angular position of servo-spool real part in s-plane angular velocity angular velocity of hydrostatic motor angular acceleration of hydrostatic motor natural resonant frequency angular velocity of hydrostatic pump 1 …”

Section: -1mentioning

confidence: 99%

Stabilization of the Mechanical Dynamics of a Road Load Simulator Using Classical Control Techniques

Stringer

Bullock

1992

Proceedings of the Institution of Mechanical Engineers, Part I:

View full text Add to dashboard Cite

The open-loop trander function of a complex hydrostatic pump-motor dynamometer system was derived from an analysis o f the dynamics of the indiuiduul components. Many system components exhibit non-linearities, however, internal feedback mechanisms contribute to linearization of sub-systems. The resulting model, which was in good agreement with the system's open-loop performance, was used to predict the behaviour of the closed-loop system, this indicated that the system would be unstable. Classical control theory was used to analyse the performance of a number of stabilizing control strategies, with root locus plots, Bode diagrams and Nichols charts being used to assess the resultant performance. A lead compensation, designed as a diffoential controller, combined with a bi-linear gain was predicted to provide acceptable speed control. The performance of the system with this controller installed was found to satisfy the design requirements of speed of response, limited overshoot and zero steady-state error.

show abstract

“…In the literature, development and use of hydraulic dynamometers are mainly for testing engine performance [4][5][6][7][8][9][10][11]. One of the earliest reports of using a dynamometer for testing a complete powertrain with simulated load and engine is [12]. Control studies of hydraulic dynamometers in the literature are few.…”

Section: Introductionmentioning

confidence: 99%

Virtual Vehicle Control Concept for Hydrostatic Dynamometer Control1

Cheng

et al. 2016

Journal of Dynamic Systems, Measurement, and Control

View full text Add to dashboard Cite

An approach for controlling a hydrostatic dynamometer for the hardware-in-the-loop (HIL) testing of hybrid vehicles is proposed and experimentally evaluated. The hydrostatic dynamometer, which is capable of absorbing and regenerating power, was specifically designed and built in-house to evaluate the fuel economy and control strategy of a hydraulic hybrid vehicle being developed. Unlike a chassis dynamometer whose inertia is similar to the inertia of the vehicle being tested, the inertia of this hydrostatic dynamometer is only 3% of the actual vehicle. While this makes the system low cost, compact, and flexible for testing vehicles with different weights and drag characteristics, control challenges result. In particular, the dynamometer must apply, in addition to the torques to mimic the wind and road drag, also the torques to mimic the acceleration and deceleration of the missing inertia. To avoid estimating the acceleration and deceleration, which would be a noncausal operation, a virtual vehicle concept is introduced. The virtual vehicle model generates, in response to the applied vehicle torque, a reference speed profile which represents the behavior of the actual vehicle if driven on the road. This reformulates the dynamometer control problem into one of enabling the actual vehicle dynamometer shaft to track the speed of the virtual vehicle, instead of directly applying a desired torque. To track the virtual vehicle speed, a controller with feedforward and feedback components is designed using an experimentally validated dynamic model of the dynamometer. The approach has been successfully tested on a power-split hydraulic hybrid vehicle with acceptable virtual vehicle speed and dynamometer torque tracking performance.

show abstract

A Regenerative Road Load Simulator

Cited by 8 publications

References 6 publications

Use of Classical Control Techniques to Stabilize the Electrical Dynamics of a Highly Unstable Road Load Simulator

Use of Classical Control Techniques to Stabilize the Electrical Dynamics of a Highly Unstable Road Load Simulator

Stabilization of the Mechanical Dynamics of a Road Load Simulator Using Classical Control Techniques

Virtual Vehicle Control Concept for Hydrostatic Dynamometer Control1

Contact Info

Product

Resources

About