A microcomputer control system for managing the automotive engine’s air-fuel ratio, spark ignition timing, exhaust gas recirculation and idle speed has been developed and is marketed in Japan under the name of ECCS.By installing this system in a 1,500 kg vehicle’s 6 cylinder 2.8 liter engine, the four factors listed above have been controlled so precisely that their optimum relative calibration has been realized.As a result, fuel economy has been improved by 10% while good drivability has been maintained.This paper outlines ECCS and describes how control factors in a “steady state” are determined. It also discusses the control sequence in transient conditions, such as “cold” starts, “hot” restarts, clutch engagement, acceleration, deceleration, gearshifts and the “warm-up” process.
Microprocessor Control Brings About Better Fuel Economy with Good Drivability
Sae Technical Papers
1980 Automotive Engineering Congress and Exposition ; 1980
1980-02-01
Conference paper
English
Microprocessor Control Brings About Better Fuel Economy with Good Driveability
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