Stop-Start Micro Hybrid: An Estimation of Automatic Engine Stop Duration in Real World Usage

Dhand, Aditya; Cho, Baekhyun; Walker, Alan W.; Muncey, Alastair; Kok, Daniël; Karden, Eckhard; Hochkirchen, Thomas

doi:10.4271/2009-01-1336

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…An attractive alternative to conventional diesel vehicles are 'micro-hybrids' that reduce fuel consumption and emissions via engine stop-start functionality, regenerative-braking and smarter electrified auxiliaries [53] (Figure 1b). They are not true hybrids as they do not provide tractive assistance, but are less expensive than more electrified drivetrains, can be retrofitted to existing diesel architectures [54], and allow manufacturers to meet legal and environmental requirements [55]. The micro-hybrids modelled in this study are Wrightbus micro-hybrid buses with a Euro VI stop-start engine, electrified air compressors, cooling fans and smart alternators [56].…”

Section: Technology Overview Of Bus Powertrains Assessedmentioning

confidence: 99%

A probabilistic fleet analysis for energy consumption, life cycle cost and greenhouse gas emissions modelling of bus technologies

Harris

Soban

Best³

2020

Applied Energy

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Section: Technology Overview Of Bus Powertrains Assessedmentioning

confidence: 99%

A probabilistic fleet analysis for energy consumption, life cycle cost and greenhouse gas emissions modelling of bus technologies

Harris

Soban

Best³

2020

Applied Energy

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“…In micro-hybrid vehicles the availability of an engine start-stop event is governed by the control strategy. The engine may not perform a start-stop process if the feature is inhibited for reasons of comfort, safety, and durability [8]. In this case, the vehicle is launched like a conventional vehicle.…”

Section: Stage I: Define the Problemmentioning

confidence: 99%

Optimization potential of the vehicle launch performance for start—stop micro-hybrid vehicles

Dhand¹,

Cho²,

Walker³

et al. 2010

Proceedings of the Institution of Mechanical Engineers, Part D:

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One of the primary features of a micro-hybrid vehicle is the automatic shutdown and restart of the engine to avoid engine idling when the vehicle is at rest. The system strategy and its calibration have important significance for the driveability of the vehicle in terms of the vehicle launch behaviour.An unsatisfactory vehicle launch is defined as an inferior launch performance of the vehicle resulting in a stalled engine, a launch with negative vehicle acceleration, and an aborted engine restart due to the inability of the vehicle to provide torque as demanded by the user. In this research, micro-hybrid system optimization for reduction in the percentage of impaired vehicle launch events in real-world usage has been conducted on a start-stop vehicle. The design for the six-sigma process was followed for the optimization study. A high-fidelity electrical and powertrain system and a longitudinal vehicle dynamics model for a start-stop vehicle have been developed. The model has been validated with experimental data. The drivers' behaviour for vehicle launch events from a customer clinic of start-stop vehicles has been used as an input to the model. Using design of experiments, the system has been optimized to maximize the percentage of successful launch events in real-world usage.

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“…Global environmental protection requirements, which have increased worldwide in recent years, have accelerated efforts for improving the fuel economy of vehicles. A typical example involves adopting engine start-stop function to reduce energy consumption when the vehicle is stopped, thus improving the urban environment [1]. This function shuts off the engine when the engine power is not required and restarts the engine when necessary.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Analysis and Control of an Automatic Transmission for Start-Stop Function and Efficiency Improvement

Yang

Wang

Dong

et al. 2015

Mathematical Problems in Engineering

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An electric oil pump (EOP) was integrated into the hydraulic system and an automatic transmission (AT) mechanical oil pump (MOP) was downsized. These processes were performed to combine a start-stop function with the AT and further improve the transmission efficiency. Furthermore, this study established a dynamics model of power loss and leakage of an 8-speed AT; a flow-based control algorithm of the EOP was then developed to realize the start-stop function and support the MOP to meet the flow requirement of the system. Based on a driving simulation method, sizes of the MOP and EOP that ensured optimal fuel economy were selected. A control strategy for the starting clutch was also developed to minimize the starting delay of the test vehicle. A test environment on a rig and prototype vehicle was established to verify the feasibility of the proposed control strategies. The test results indicated that the transmission functioned favorably with the novel two-pump system presented, and a quick and smooth starting performance was achieved when the engine was restarted. The findings in this study are extremely valuable for forward designs of an AT for realizing start-stop function and improving efficiency.

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Stop-Start Micro Hybrid: An Estimation of Automatic Engine Stop Duration in Real World Usage

Cited by 9 publications

References 3 publications

A probabilistic fleet analysis for energy consumption, life cycle cost and greenhouse gas emissions modelling of bus technologies

A probabilistic fleet analysis for energy consumption, life cycle cost and greenhouse gas emissions modelling of bus technologies

Optimization potential of the vehicle launch performance for start—stop micro-hybrid vehicles

Dynamic Analysis and Control of an Automatic Transmission for Start-Stop Function and Efficiency Improvement

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