Method and control apparatus for operating an internal combustion engine
First Claim
1. A control apparatus for operating an internal combustion engine, the control apparatus comprising:
- a memory storing a computer program for carrying out a method for operating an internal combustion engine including a combustion chamber, a crankshaft and inlet and outlet valves opening to said combustion chamber, the method comprising the steps of;
detecting the rpm (nmot) of said crankshaft;
considering a fresh air charge (rl) of said combustion chamber and said rpm (nmot) when computing a pressure (ps) in a region lying upstream of said inlet valve by utilizing at least one of thermodynamic equations and flow equations at at least one discrete time point during a work cycle of said engine;
or, considering a pressure (ps) in said region and said rpm (nmot) when computing said fresh air charge (rl) of said combustion chamber by utilizing one of thermodynamic equations and flow equations at at least one discrete time point during a work cycle of said engine.
1 Assignment
0 Petitions
Accused Products
Abstract
An internal combustion engine includes a combustion chamber, a crankshaft and inlet and outlet valves. The engine is operated with a method wherein a fresh air charge (rl) of the combustion chamber and the engine rpm (nmot) are considered when computing a pressure (ps) in a region lying upstream of the inlet valve. The computation is done by utilizing at least one of thermodynamic equations and flow equations at at least one discrete time point during a work cycle of the engine. Or, a pressure (ps) in the above region and the rpm (nmot) of the crankshaft are considered when computing the fresh air charge (rl) of the combustion chamber by utilizing one of thermodynamic equations and flow equations at at least one discrete time point during a work cycle of the engine.
23 Citations
18 Claims
-
1. A control apparatus for operating an internal combustion engine, the control apparatus comprising:
- a memory storing a computer program for carrying out a method for operating an internal combustion engine including a combustion chamber, a crankshaft and inlet and outlet valves opening to said combustion chamber, the method comprising the steps of;
detecting the rpm (nmot) of said crankshaft;
considering a fresh air charge (rl) of said combustion chamber and said rpm (nmot) when computing a pressure (ps) in a region lying upstream of said inlet valve by utilizing at least one of thermodynamic equations and flow equations at at least one discrete time point during a work cycle of said engine;
or,considering a pressure (ps) in said region and said rpm (nmot) when computing said fresh air charge (rl) of said combustion chamber by utilizing one of thermodynamic equations and flow equations at at least one discrete time point during a work cycle of said engine.
- a memory storing a computer program for carrying out a method for operating an internal combustion engine including a combustion chamber, a crankshaft and inlet and outlet valves opening to said combustion chamber, the method comprising the steps of;
-
2. A computer program comprising a method which can be carried out when said computer program is run on a computer, the method being for operating an internal combustion engine including a combustion chamber, a crankshaft and inlet and outlet valves opening to said combustion chamber, the method comprising the steps of:
-
detecting the rpm (nmot) of said crankshaft;
considering a fresh air charge (rl) of said combustion chamber and said rpm (nmot) when computing a pressure (ps) in a region lying upstream of said inlet valve by utilizing at least one of thermodynamic equations and flow equations at at least one discrete time point during a work cycle of said engine;
or,considering a pressure (ps) in said region and said rpm (nmot) when computing said fresh air charge (rl) of said combustion chamber by utilizing one of thermodynamic equations and flow equations at at least one discrete time point during a work cycle of said engine. - View Dependent Claims (3)
-
-
4. A method for operating an internal combustion engine including a combustion chamber, a crankshaft and inlet and outlet valves opening to said combustion chamber, the method comprising the steps of:
-
detecting the rpm (nmot) of said crankshaft;
considering a fresh air charge (rl) of said combustion chamber and said rpm (nmot) when computing a pressure (ps) in a region lying upstream of said inlet valve by utilizing at least one of thermodynamic equations and flow equations at at least one discrete time point during a work cycle of said engine;
or,considering a pressure (ps) in said region and said rpm (nmot) when computing said fresh air charge (rl) of said combustion chamber by utilizing one of thermodynamic equations and flow equations at at least one discrete time point during a work cycle of said engine. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
while considering the mass components (m_rgres, m_rgreasp, m_fg) of the residual remainder gas and/or of the reaspirative remainder gas and the fresh air and respective temperatures (T_rgres, T_rgreasp, T_fg).
-
-
12. The method of claim 5, wherein, in the computation, the measured or modeled pressure (p_abnav) of the gas in the region, which lies downstream of said outlet valve, is corrected in dependence upon said rpm (nmot) of said crankshaft and/or in dependence upon the closing angle (wnwa) of said outlet valve.
-
13. The method of claim 5, wherein the mass (m_rgres) of the residual remainder gas is determined by means of the combustion chamber volume (V_es), which is present at the closing time point of the outlet valve or at approximately the center of the valve overlapment (wnwvue).
-
14. The method of claim 4, wherein, in the computation, the measured or modeled pressure (ps) of the gas in the region, which lies upstream of said outlet valve, is corrected in dependence upon said rpm (nmot) of said crankshaft and/or in dependence upon the opening angle (wnwe) of said inlet valve.
-
15. The method of claim 4, wherein one proceeds from the status equation for ideal gases in the thermodynamic computations.
-
16. The method of claim 15, wherein the assumption is made for the computations that the heat capacity and/or the isentropic exponent of the remainder gas or the components of the remainder gas have the same values as that of fresh air.
-
17. The method of claim 15, wherein the status equation for ideal gases is used for adiabatic conditions.
-
18. The method of claim 15, wherein the influence of heat transfers on a detected or modeled temperature is considered with a corrective function upstream of the inlet valve.
Specification