Objective
To reduce fuel consumption of all petrol engines through optimization of ignition and combustion functions.
Four different types of car were tested for reductions in fuel consumption, with the measurement of energy saving dependent on the following:
- operation: warm engine or absence of starter;
- ambient temperature: warm engine or absence of starter;
- the carburetter used in the comparisons
Fuel gain Fuel gain
UTAC cycle finished warm engine
cold engine UTAC cycle
At 20 deg. C, in comparison
with 'mini' series 0.84 0.55
carburetter
At 20 deg. C, in comparison
with 'maxi' series 1.6 1.31
At 20 deg. C,in comparison
with average 'maxi-mini.' 1.22 0.93
At 0 deg. C, in comparison
with 'mini' series 1.08 0.94
It appears therefore, that the actual saving is between 1 and 1.5 litres/100 km in urban driving with warmed emgine.
Thomson-CSF, which has designed and is currently producing all-electronic ignition (a.I.E.) and combustion control (c.E.C.)systems is also further developing the autoprocessor, a total electronic engine-control system. At present however the system is designed to operate according to parameters established by motor designers i.E. According to conventional criteria of vehicle use. Various studies on the different cases of vehicle use show that the majority of vehicles do not operate to the full extent of the ideal conditions conceived by automobile manufacturers. As a matter of facthermal balance conditions, for which engines are designed, are rarely achieved because cars are used for short trips. As a result fuel consumption is maximum due to choke play (cylinders are overfed with petrol) and because of improper internal combustion.
Whence the idea of basing normal utilisation on the short trip and of designing engines to respond to the particular conditions associated with theshort trip. Whence to Thomson-CSF's project to complement its autoprocessor system by incorporating an "electric choke" to optimize combustion (mixture richness) and ignition (advance and energy curbes) parameters necessary to satisfactory engine operation for internal temperature balance inferior to conventional norms.
Introduction of the "electronic choke" should lead to a per diem petrol consumption economy of approximately 15%.
Programme(s)
Topic(s)
Call for proposal
Data not availableFunding Scheme
DEM - Demonstration contractsCoordinator
75781 Paris
France