EP0346989A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Intelligent control of motor vehicle gas equipment
Assignee: Necam BV
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Filing: 1989-06-09
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Granted: —
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Expires: 2009-06-09
Abstract
Abstract Device for the intelligent control of a venturi-type carburettor unit for a gaseous fuel, including a pressure regulator (11), a main throttle valve (5) in the airsuction pipe for control of the engine output and a regulating valve (17) in the gassupply pipe (13) between the pressure regulator (11) and the venturi (15), said valve being coupled to the main throttle valve. By adjusting this mechanical system for providing a too rich air-fuel-mixture under all conditions, only minor adjustments of the mixture are necessary to provide the engine with the correct mixture required for each load/speed condition. Said requirements are stored in a processor (40), and the latter controls the necessary corrections of the mixture by diluting the gasflow to the main venturi with some air. To this end a small venturi (31) is placed in the gaspipe (13), the gasflow sucking the diluting air through a mixing air regulating valve (35), which valve is controlled by the processor (40) in a continuous, analogues intelligent way. Optionally an O₂-sensor (47) placed in the exhaust gases may send feed-backsignals to the processor for last corrections.
Inventors
- 👤 Jouke Van Der Weide
- 👤 Adrianus Johannes Theodorus Hoogeboom
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 04:17
CPC Classifications
F; F02; F02M; F02M21/00; F02M21/02; F02M21/04; F02M21/047; F02M21/0218; F02M21/023; F02M21/0239; F02M21/0203; F02M21/0209; F02M21/0212; F02M21/042; F02M21/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
315 words
Device for the intelligent control of a carburettor unit for a gaseous fuel, in particular LPG, for an internal-combustion engine, comprising a vaporizer/pressure regulator which may or may not be combined, suitable for the conversion of liquid or non-liquid gas at tank pressure into vapour form (hereinafter called "gas") at a pressure near the air pressure upstream relative to the carburettor unit, a connecting line for infeed of the gas to a venturi-type mixing device for mixing the gas with the combustion air sucked in by the engine, a main throttle valve for the intake combustion air to control the engine output, said main throttle valve being coupled to the accelerator pedal and being situated upstream relative to the venturi gas mixing device, and a regulating valve for the quantity of gas supplied during running to the mixing device, which is coupled to the main throttle valve, characterized in that the intelligent part of the control means is formed by an correction device containing a supply device (30) for mixing air which is accommodated in the gas supply pipe (13) between the pressure regulator (11) and the gas regulating valve (17), and the mixing air supply pipe (33) contains a mixing air regulating valve (35), while the gas regulating valve (17) is dimensioned in such a way that in all running conditions of the engine too rich a gas/air mixture can be supplied by it, and in which the correction device lowers the "quality" of the infed gas in such a way by dilution with mixing air that the engine can always be supplied with the desired gas/air mixture by the mixing device (10), and in that the mixing air supply device (30) is a small venturi (31) with annular channel (32), through the throat of which the gas supply flow is guided in order to suck the mixing air in through the annular channel.
Claim 2
Dependent Claim
315 words
Device for the intelligent control of a carburettor unit for a gaseous fuel, in particular LPG, for an internal-combustion engine, comprising a vaporizer/pressure regulator which may or may not be combined, suitable for the conversion of liquid or non-liquid gas at tank pressure into vapour form (hereinafter called "gas") at a pressure near the air pressure upstream relative to the carburettor unit, a connecting line for infeed of the gas to a venturi-type mixing device for mixing the gas with the combustion air sucked in by the engine, a main throttle valve for the intake combustion air to control the engine output, said main throttle valve being coupled to the accelerator pedal and being situated upstream relative to the venturi gas mixing device, and a regulating valve for the quantity of gas supplied during running to the mixing device, which is coupled to the main throttle valve, characterized in that the intelligent part of the control means is formed by an correction device containing a supply device (30) for mixing air which is accommodated in the gas supply pipe (13) between the pressure regulator (11) and the gas regulating valve (17), and the mixing air supply pipe (33) contains a mixing air regulating valve (35), while the gas regulating valve (17) is dimensioned in such a way that in all running conditions of the engine too rich a gas/air mixture can be supplied by it, and in which the correction device lowers the "quality" of the infed gas in such a way by dilution with mixing air that the engine can always be supplied with the desired gas/air mixture by the mixing device (10), and in that the mixing air supply device (30) is a small venturi (31) with annular channel (32), through the throat of which the gas supply flow is guided in order to suck the mixing air in through the annular channel.
Claim 3
Dependent Claim
73 words
Device according to Claim 1, characterized in that the mixing air regulating valve (35) is formed by a throttle valve (36, 36a) which is adjustable by an adjusting motor, in particular a stepping motor, while there is an electronic control unit or processor (40) for control of the motor which is pre-programmed with one or more performance graphs of the internal-combustion engine and receives signals on current running conditions of the internal-combustion engine.
Claim 4
Dependent Claim
66 words
Device according to one or more of the preceding claims, characterized in that the electronic control unit or processor (40) receives at least a signal from a sensor (42) which measures the partial vacuum prevailing in the intake pipe (1) of the engine for the gas/air mixture, downstream of the venturi mixing device (10), and from a sensor (41) which measures the speed of the engine.
Claim 5
Dependent Claim
40 words
Device according to Claim 3, characterized in that the engine is provided with a measuring instrument for the momentary sucked-in air mass, which emits a signal to the processor as a function of the engine load and the engine speed.
Claim 6
Dependent Claim
92 words
Device according to one or more of the preceding claims, characterized in that the processor (40) is also fed with signals coming from sensors fitted on the engine to report back the position of the main throttle valve (or the gas regulating valve (43)), or to measure the temperature of the gas supply (45) diluted with air and of the intake combustion air (44), together with or without the measuring signal (46) of a lambda probe (47) placed in the exhaust pipe (8) of the internal-combustion engine for measuring the 0₂ concentration.
Claim 7
Dependent Claim
40 words
Device according to one or more of the preceding claims, characterized in that the air chamber of the low-pressure diaphragm of the gas pressure regulator (11) is connected by a measuring line (48) to the mixing air throttle valve (35).
References Cited (Backward Citations)
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