Hydraulic Hybrid Powertrain-In-the-Loop Integration for Analyzing Real-World Fuel Economy and Emissions Improvements

Tavares, Fernando; Johri, Rajit; Salvi, Ashwin; Baseley, Simon; Filipi, Zoran

doi:10.4271/2011-01-2275

Cited by 19 publications

(9 citation statements)

References 22 publications

(32 reference statements)

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“…Most of them are bent-axis variable displacement pumps [11], [14], [15], [16]. But also swashplate axial piston pumps [12] or digital displacement pumps [17] are used.…”

Section: B Technological Overviewmentioning

confidence: 99%

Hydropneumatic storage technology for hybrid passenger cars

Wohlgemuth¹,

Wachtmeister²

2013

2013 3rd International Electric Drives Production Conference (EDPC)

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The development of today's powertrains focusses on the reduction of vehicles' CO 2 -emissions. Therefore several new technologies for internal combustion engines have been established. A further tendency is the advancing hybridization and electrification of powertrains vehicles. However, these trends lead to increasing system costs, which are a very important aspect at the market segment of compact cars. At the Institute of Internal Combustion Engines of the Technische Universitaet Muenchen a drivetrain concept for urban and commuter traffic is under development. It is based on a lean burn air cooled twocylinder natural gas engine, which is combined with a hydraulic hybrid system. The paper contains detailed information about the hydraulic hybrid drivetrain and especially about the hydropneumatic storage technology. Particular characteristics and innovations of the hydraulic hybrid system compared to systems known so far are presented and discussed.

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“…Most of them are bent-axis variable displacement pumps [11], [14], [15], [16]. But also swashplate axial piston pumps [12] or digital displacement pumps [17] are used.…”

Section: B Technological Overviewmentioning

confidence: 99%

Hydropneumatic storage technology for hybrid passenger cars

Wohlgemuth¹,

Wachtmeister²

2013

2013 3rd International Electric Drives Production Conference (EDPC)

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“…It was further developed by Tavares et al in [17], in which it was referred to as a hydrostatic control strategy. The purpose of this control strategy is to maintain the pressure in accumulator at a constant level in order to prevent the engine from charging the accumulator unnecessarily.…”

Section: Supervisormentioning

confidence: 99%

“…, which minimizes the cost function, represented by Equation (27), and subjected to the constraints provided by Equations (14) and (17).…”

Section: Optimizermentioning

confidence: 99%

A Model Predictive Control Approach for Fuel Economy Improvement of a Series Hydraulic Hybrid Vehicle

Chen

Hung

2014

Energies

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Abstract:This study applied a model predictive control (MPC) framework to solve the cruising control problem of a series hydraulic hybrid vehicle (SHHV). The controller not only regulates vehicle velocity, but also engine torque, engine speed, and accumulator pressure to their corresponding reference values. At each time step, a quadratic programming problem is solved within a predictive horizon to obtain the optimal control inputs. The objective is to minimize the output error. This approach ensures that the components operate at high efficiency thereby improving the total efficiency of the system. The proposed SHHV control system was evaluated under urban and highway driving conditions. By handling constraints and input-output interactions, the MPC-based control system ensures that the system operates safely and efficiently. The fuel economy of the proposed control scheme shows a noticeable improvement in comparison with the PID-based system, in which three Proportional-Integral-Derivative (PID) controllers are used for cruising control.

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“…In the literature, development and use of hydraulic dynamometers have focused on testing engine performances [4][5][6][7][8][9]. One of the earliest report of dynamometer for testing a complete power-train, with simulated load and engine, is found in [10].…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Validation of a Virtual Vehicle Control Concept for Testing Hybrid Vehicles Using a Hydrostatic Dynamometer

Cheong

et al. 2014

Volume 1: Active Control of Aerospace Structure; Motion Control; Aerospace Control; Assistive Robotic Systems; Bio-Inspired Sys

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An approach to control a hydrostatic dynamometer for the Hardware-In-the-Loop (HIL) testing of hybrid vehicles has been developed and experimentally tested. The hydrostatic dynamometer used, which is capable of regeneration, was specifically designed and built in-house to evaluate the fuel economy and control strategy of a hydraulic hybrid vehicle. The control challenge comes from the inertia of the dynamometer being only 3% of that of the actual vehicle so that the dynamometer must apply, in addition to any drag torques, acceleration/deceleration torques related to the difference in inertias. To avoid estimating the acceleration which would be a non-causal operation, a virtual vehicle concept is introduced. The virtual vehicle model generates a reference speed profile which represents the behavior of the actual vehicle if driven on the road. The dynamometer control problem becomes one of enabling the actual vehicle-dyno shaft to track the speed of the virtual vehicle, instead of directly applying a desired torque. A feedback/feedforward controller was designed based upon an experimentally validated dynamic model of the dynamometer. The approach was successfully tested on a power-split hydraulic hybrid vehicle with acceptable speed and torque tracking performance.

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Hydraulic Hybrid Powertrain-In-the-Loop Integration for Analyzing Real-World Fuel Economy and Emissions Improvements

Cited by 19 publications

References 22 publications

Hydropneumatic storage technology for hybrid passenger cars

Hydropneumatic storage technology for hybrid passenger cars

A Model Predictive Control Approach for Fuel Economy Improvement of a Series Hydraulic Hybrid Vehicle

Design and Experimental Validation of a Virtual Vehicle Control Concept for Testing Hybrid Vehicles Using a Hydrostatic Dynamometer

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