System and method for metering the fuel supply to a combustion installation operating on more than one type of fuel
First Claim
1. System for the metered supply of at least a first and a second type of fuel, in particular petrol and LPG (Liquid Petroleum Gas), to a combustion installation, such as an internal combustion engine (1), comprising a first electronic control unit (8) for metering, via fuel supply means (4, 6), the supply of the first and second fuel, and detection means (10) for the detection of process and operating parameter values of the combustion installation, and a second electronic control unit (12), coupled to the first control unit (8) and the fuel supply means (4, 6), for metering the supply of the second fuel under the control of the first control unit (8), characterized in that said first electronic control unit (8) has adaptive control characteristics and said second electronic control unit (12) is provided with recording means (20) for, during operation on the first fuel, recording, in dependence of respective detected process and operating parameter values, first control signal values emitted by the first control unit (8) and with control and comparison means (19) for, during operation on the second fuel, comparing, in dependence o the process and operating parameters concerned, the momentarily emitted first control signal values with the first control signal values recorded by the recording means (20), in order so to adjust second control signal values emitted by the second control unit (12) that the momentarily emitted first control signal values are kept within a predetermined range with respect to the recorded first control signal values.
2 Assignments
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Accused Products
Abstract
In order to supply a combustion installation, such as an internal combustion engine, with a second type of fuel, in particular LPG, in addition to a first type of fuel, such as petrol, a second control unit is coupled to a first or original electronic control unit of the engine. In response to first control signal values emitted by the first control unit, said second control unit, during operation on LPG, emits second control signal values for metering the LPG supply. With this arrangement the first control signal values received from the first control unit are compared with the values recorded by the second control unit during operation on petrol. The second control signal values emitted by the second control unit are now so adusted that, during operation on LPG, the first control signal values are still kept within a predetermined range (operating range) of the first control signal values recorded during operation on petrol.
27 Citations
19 Claims
- 1. System for the metered supply of at least a first and a second type of fuel, in particular petrol and LPG (Liquid Petroleum Gas), to a combustion installation, such as an internal combustion engine (1), comprising a first electronic control unit (8) for metering, via fuel supply means (4, 6), the supply of the first and second fuel, and detection means (10) for the detection of process and operating parameter values of the combustion installation, and a second electronic control unit (12), coupled to the first control unit (8) and the fuel supply means (4, 6), for metering the supply of the second fuel under the control of the first control unit (8), characterized in that said first electronic control unit (8) has adaptive control characteristics and said second electronic control unit (12) is provided with recording means (20) for, during operation on the first fuel, recording, in dependence of respective detected process and operating parameter values, first control signal values emitted by the first control unit (8) and with control and comparison means (19) for, during operation on the second fuel, comparing, in dependence o the process and operating parameters concerned, the momentarily emitted first control signal values with the first control signal values recorded by the recording means (20), in order so to adjust second control signal values emitted by the second control unit (12) that the momentarily emitted first control signal values are kept within a predetermined range with respect to the recorded first control signal values.
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16. Method for the metered supply of at least a first and a second type of fuel, in particular petrol and LPG (Liquid Petroleum Gas), to a combustion installation, such as an internal combustion engine (1), comprising a first electronic control unit (8) for motoring, via fuel supply means (4, 6), the supply of the first and second fuel, and detection means (10) for the detection of process and operating parameter values of the combustion installation, and a second electronic control unit (12), coupled to the first control unit (8) and the fuel supply means (4, 6), for metering the supply of the second fuel under the control of the first control unit (8), characterized by the steps of:
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recording, by the second control unit (12), during operation on the first fuel, in dependence of respective detected process and operating parameter values, first control signal values emitted by the first control unit (8), said first control unit having adaptive control characteristics, comparing, by the second control unit (12), during operation on the second fuel, in dependence of the respective detected process and operating parameter values, the momentarily emitted first control signal values with the recorded first control signal values, and, in case of a difference between the momentarily emitted and the recorded first control signal values outside a predetermined range, adjusting the second control signal values emitted by the second control unit (12) so as to keep the difference within the range concerned. - View Dependent Claims (17, 18, 19)
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Specification