Browse Publications Technical Papers 2013-32-9071
2013-10-15

Development of Belt-Driven Starter-Generator Control Strategy for Hybrid Electric Vehicle 2013-32-9071

A Hybrid electric vehicle saves fuel by four aspects, i.e. engine idle-stop, regenerative braking, engine downsizing, and engine load change. Saving fuel by 5-10% is achievable with optimized fuel cut-off strategy. However, emission and drivability trade-off must be carefully treated.
The conventional automatic transmission requires a mechanical pump driven by the engine crankshaft offers hydraulic function, lubrication, and cooling. To stop the engine during vehicle idling, transmission fluid pressure will not be sufficiently maintained for the launch clutch in engaged status. Once the engine restarts, the engine speed profile can cause the transmission fluid pressure uncontrollable, which creates bump during vehicle take-off. In most vehicles equipped with a conventional automatic transmission (AT) as well as start-stop function, an electric oil pump is usually installed to maintain fluid pressure. However, cost and complexity increase, and the electric pump is redundant to the mechanical pump during normal driving.
This paper presents a method for smoothing the change of automatic transmission fluid (ATF) pressure by utilizing the belt-driven starter-generator (BSG) using field oriented control (FOC) method and the correlation curve between AT fluid pressure and rotational speed of BSG. The proposed system reduced the numbers of changes and incremental cost due to additional start/stop technology applied to the existing vehicle design.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
STANDARD

Accessory Drive Tensioner Test Standards

J2436_201607

View Details

JOURNAL ARTICLE

High Efficiency, Hydro-Mechanical Passenger Vehicle Transmission using Fixed Displacement Pump/Motors and Digital Hydraulics

2012-01-0624

View Details

TECHNICAL PAPER

CVT, Promising Solutions for Electrification

2019-01-0359

View Details

X