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EP0061856A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Measurement of air mass flow into an internal combustion engine

Assignee: ZF International UK Ltd
•
Filing: 1982-03-12
•
Granted: —
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Expires: 2002-03-12
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Abstract

Abstract An air mass flow measuring system for measuring flow into an internal combustion engine comprises a throttle angle transducer (13) and further transducers measuring ambient air temperature (16) and pressure (15) as well as the pressure drop (14) across the throttle value. The signals from these transducers are supplied to a calculating circuit which carries out the calculationThe values of the coefficient K used in this calculation are derived from an empirically programmed read only memory incorporated in the calculating circuit, such memory storing empirically determined values of K for each combination of a plurality of values of throttle angle and a plurality of values of

Inventors

  • 👤 Allan William Locke
  • 👤 Peter Fitzpatrick

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-01 16:43
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/363; G01F1/76; G01F1/86; G01F1/88

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 129 words
An air mass flow measurement system into an internal combustion engine comprising an air intake throttle position transducer and further transducers sensitive to ambient air pressure, ambient air temperature and the pressure downstream of the throttle and a calculating circuit connected to said transducers and arranged to execute the calculation where M is the air mass flow K is an orifice coefficient of discharge P is the ambient air pressure T is the ambient air temperature and P is the pressure drop through the throttle, said calculating circuit including a digital memory containing empirically determined data representing the value of K for each combination of a plurality of different values of the throttle position and a plurality of different values of one or a combination of P,ΔP and T.
Claim 2
Dependent Claim 129 words
An air mass flow measurement system into an internal combustion engine comprising an air intake throttle position transducer and further transducers sensitive to ambient air pressure, ambient air temperature and the pressure downstream of the throttle and a calculating circuit connected to said transducers and arranged to execute the calculation where M is the air mass flow K is an orifice coefficient of discharge P is the ambient air pressure T is the ambient air temperature and P is the pressure drop through the throttle, said calculating circuit including a digital memory containing empirically determined data representing the value of K for each combination of a plurality of different values of the throttle position and a plurality of different values of one or a combination of P,ΔP and T.
Claim 3
Dependent Claim 40 words
A measurement system as claimed in Claim 1 in which the memory data represents the value of K for each combination of a plurality of different values of the throttle position and a plurality of different values of the expression
Claim 6
Dependent Claim 43 words
A measurement system as claimed in Claim 1 or Claim 2 including means for sampling the outputs of the transducers cyclically, the sampling interval for the ambient air pressure and ambient air temperature being longer than the sampling interval for the other variables.

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