The value of a specific car is defined in various ways for different consumers. Many will appreciate low fuel consumption; this is universally true as gasoline prices become a significant component in the total cost of the car in most markets. Also, high engine power may be of great importance, depending on make and model of the car. Dynamic, yet comfortable delivery of this engine power also appears to become more and more relevant for any consumer group. Finally, a high level of reliability and availability as well as the fulfillment of emission regulations is an absolute necessity. Increasingly complex control strategies and algorithms must be introduced. During the past 15 years the amount of functionalities for engine control has increased dramatically by a factor of ten and the development time is reduced by two. To answer to these requests Siemens VDO has developed a 32bit digital electronic control unit and its control algorithms for modern stoichiometric Dl engines with the following features: high specific power (60 kW/l) for naturally aspirated engine quick torque response with minimum acceleration jerk reduction of fuel consumption by about 5% increase of combustion stability (COV) and driving comfort through double injection (DUI) especially during catalyst heating phase and cylinder individual lambda improvement of driving-off response due to torque increase of about 20% at low engine speed with turbo Dl engine Digital engine electronics makes all these functions possible; either as an enabling technology (needed to operate a Dl engine in a meaningful manner) or as the sole means to implement a certain feature (such as driving comfort features like anti-jerk functions). The availability of complex digital hardware at acceptable cost, simple ways to store information and code, and modern software technology provide a versatile and effective instrument to deliver consumer-specific products.
Fuel consumption reduction and driving performance: digital engine management systems make it possible
Fahrleistung bei reduziertem Kraftstoffverbrauch - möglich durch digitale Motorsteuerungssysteme
2004
7 Seiten, 10 Bilder, 1 Tabelle, 10 Quellen
Conference paper
English
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