Mass air flow estimation based on manifold absolute pressure
AssigneeGeneral Motors Corporation
InventorsLjubisa Mladenovic, Kenneth Buslepp, Douglas Trombley
Life of this patent
Estimating the term…
Abstract
A control system that determines a mass air flow through a throttle of an internal combustion engine (ICE) having an intake manifold includes a calculator that calculates an estimated mass air flow based on a throttle position and an adjustment module that determines an adjustment value. The adjustment value is based on the estimated mass air flow, an estimated manifold absolute pressure and a measured manifold absolute pressure. A multiplier multiplies the estimated mass air flow by the adjustment value to determine the mass air flow.
Claims26
A control system that determines a mass air flow through a throttle of an internal combustion engine (ICE) having an intake manifold, comprising:
- a calculator that calculates an estimated mass air flow based on a throttle position;
- an adjustment module that determines an adjustment value based on said estimated mass air flow, an estimated manifold absolute pressure and a measured manifold absolute pressure;
- and
- a multiplier that multiplies said estimated mass air flow by said adjustment value to determine said mass air flow.
(canceled)
The vehicle of claim 11 wherein said controller calculates said mass air flow based on an estimated manifold absolute pressure.
The vehicle of claim 11 wherein said estimated manifold absolute pressure is further based on a previous value of said mass air flow, a volumetric efficiency of said engine, a volume of said intake manifold and a temperature of said intake manifold.
A vehicle having a throttle that regulates a mass air flow into an intake manifold of an engine, comprising:
- a throttle position sensor that monitors a position of said throttle and that generates a throttle position signal;
- and
- a controller that calculates an estimated mass air flow based on said throttle position signal, that calculates said mass air flow based on said estimated mass air flow and an adjustment value, wherein said adjustment value is based on a manifold absolute pressure error and said estimated mass air flow, and operates said vehicle based on said mass air flow.
A method of determining a mass air flow into an intake manifold of an engine, comprising:
- calculating an estimated mass air flow based on a throttle area;
- determining an adjustment value based on said estimated mass air flow, an estimated manifold absolute pressure and a measured manifold absolute pressure;
- and
- calculating said mass air flow based on said estimated mass air flow and said adjustment value.
Dependencies are inferred from the claim text.