Engine torque calculation

US 6,584,391 B2
Filed: 07/23/2001
Issued: 06/24/2003
Est. Priority Date: 07/23/2001
Status: Expired due to Term

First Claim

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1. A torque calculation method for providing real time data that measures net torque output of a running engine at a rotating member of the engine, the method comprising:

processing data that includes engine speed data and engine fueling data to create engine gross torque data for the running engine;

processing data related to torque losses due to running of the engine to create engine running torque loss data;

processing engine speed data to create engine acceleration and deceleration data;

processing the engine acceleration and deceleration data with data defining a moment of inertia attributable to the rotating member and engine mechanism coupled to that member to create data measuring inertial torque;

algebraically adding the inertial torque data to, and subtracting the engine running torque loss data from, the engine gross torque data to create engine net running torque data; and

processing the engine net running torque data and engine speed data according to a filter algorithm that compensates the engine net running torque data for engine speed.

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Abstract

A torque calculator and method for providing real time data that measures net torque output of a running engine in a motor vehicle. Gross torque production is calculated using engine speed and fueling data. Torque losses due to accessories, pumping, and friction are calculated and subtracted from gross torque production, and inertial torque is also accounted for to yield engine net running torque. The engine net running torque data and engine speed data are processed according to a filter algorithm that compensates the engine net running torque data for engine speed. Transmission shifting is controlled by the speed-compensated engine net running torque.

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16 Claims

1. A torque calculation method for providing real time data that measures net torque output of a running engine at a rotating member of the engine, the method comprising:
- processing data that includes engine speed data and engine fueling data to create engine gross torque data for the running engine;
  
  processing data related to torque losses due to running of the engine to create engine running torque loss data;
  
  processing engine speed data to create engine acceleration and deceleration data;
  
  processing the engine acceleration and deceleration data with data defining a moment of inertia attributable to the rotating member and engine mechanism coupled to that member to create data measuring inertial torque;
  
  algebraically adding the inertial torque data to, and subtracting the engine running torque loss data from, the engine gross torque data to create engine net running torque data; and
  
  processing the engine net running torque data and engine speed data according to a filter algorithm that compensates the engine net running torque data for engine speed.
- View Dependent Claims (2, 3, 4, 5, 6)
- - 2. A method as set forth in claim 1 wherein the step of processing the engine net running torque data according to a filter algorithm that is compensated for engine speed comprises processing the engine net torque running data according to the algorithm:
    - $y (k) = \frac{x (k) + x (k - 1) - y (k - 1) * (1 - \frac{2 τ}{dt})}{(1 + \frac{2 τ}{dt})}$ $where; \begin{matrix} y (k) = TQ_FILT (the curent value of the filter algorithm \\ output) \end{matrix}$ $\begin{matrix} y (k - 1) = TQ_FILT previous (the previous value of the filter \\ algorithm output) \end{matrix}$ $\begin{matrix} x (k) = TQ_TRANS (the current value of the input to the \\ filter algorithm) \end{matrix}$ $\begin{matrix} x (k - 1) = TQ_TRANS previous (the previous value of the \\ input to the filter algorithm) \end{matrix}$ $\begin{matrix} dt = BG_TIMER (the time step since last execution of the \\ algorithm) \end{matrix}$ $\begin{matrix} τ = TQ_TAU (the filter algorithm'"'"' s time constant compensated \\ for engine speed) . \end{matrix}$
  - 3. A method as set forth in claim 1 wherein the step of processing data related to torque losses due to running of the engine to create engine running torque loss data comprises processing data relevant to torque loss due to engine air pumping, data relevant to torque loss due to operation of engine-driven accessories, data relevant to torque loss due to engine oil pumping, and data relevant to engine running friction to create engine air pumping torque loss data, engine-driven accessory torque loss data, engine oil pumping torque loss data, and engine running friction torque loss data, and
- 4. A method as set forth in claim 1 wherein the step of processing data that includes engine speed data and engine fueling data to create engine gross torque data for the running engine includes compensating the gross torque data for changes in altitude.
- 5. A method as set forth in claim 1 wherein the step of processing data that includes engine speed data and engine fueling data to create engine gross torque data for the running engine includes compensating the gross torque data for changes in engine air-fuel ratio.
- 6. A method as set forth in claim 1 including the step of using the speed-compensated engine net running torque data in controlling shifting of a transmission through which the engine powers a motor vehicle.

7. An internal combustion engine operating system comprising:
- a processor for providing real time data that measures net torque output of a running engine at a rotating member of the engine, wherein the engine processor operates;
  
  to process data that includes engine speed data and engine fueling data to create engine gross torque data for the running engine;
  
  to process data related to torque losses due to running of the engine to create engine running torque loss data;
  
  to process engine speed data to create engine acceleration and deceleration data;
  
  to process the engine acceleration and deceleration data with data defining a moment of inertia attributable to the rotating member and engine mechanism coupled to that member to create data measuring inertial torque;
  
  to algebraically add the inertial torque data to, and subtract the engine running torque loss data from, the engine gross torque data to create engine net running torque data; and
  
  to process the engine net running torque data and engine speed data according to a filter algorithm that compensates the engine net running torque data for engine speed.
- View Dependent Claims (8, 9, 10, 11)
- - 8. An internal combustion engine operating system as set forth in claim 7 wherein the processor processes the engine net running torque data according to the algorithm:
    - $y (k) = \frac{x (k) + x (k - 1) - y (k - 1) * (1 - \frac{2 τ}{dt})}{(1 + \frac{2 τ}{dt})}$ $where; \begin{matrix} y (k) = TQ_FILT (the curent value of the filter algorithm \\ output) \end{matrix}$ $\begin{matrix} y (k - 1) = TQ_FILT previous (the previous value of the filter \\ algorithm output) \end{matrix}$ $\begin{matrix} x (k) = TQ_TRANS (the current value of the input to the \\ filter algorithm) \end{matrix}$ $\begin{matrix} x (k - 1) = TQ_TRANS previous (the previous value of the \\ input to the filter algorithm) \end{matrix}$ $\begin{matrix} dt = BG_TIMER (the time step since last execution of the \\ algorithm) \end{matrix}$ $\begin{matrix} τ = TQ_TAU (the filter algorithm'"'"' s time constant compensated \\ for engine speed) . \end{matrix}$
  - 9. An internal combustion engine operating system as set forth in claim 7 wherein the processor processes data related to torque losses due to running of the engine to create engine running torque loss data comprises processing data relevant to torque loss due to engine air pumping, data relevant to torque loss due to operation of engine-driven accessories, data relevant to torque loss due to engine oil pumping, and data relevant to engine running friction to create engine air pumping torque loss data, engine-driven accessory torque loss data, engine oil pumping torque loss data, and engine running friction torque loss data, and
- 10. An internal combustion engine operating system as set forth in claim 7 wherein the processor processes data that includes engine speed data and engine fueling data to compensate the engine gross torque data for changes in altitude.
- 11. An internal combustion engine operating system as set forth in claim 7 wherein the processor processes data that includes engine speed data and engine fueling data to compensate the engine gross torque data for changes in engine air-fuel ratio.

12. A motor vehicle comprising:
- an internal combustion engine, a drivetrain coupled to the engine through a transmission, and an operating system comprising;
  
  a processor for providing real time data that measures net torque output of the running engine available for input to the transmission, wherein the engine processor operates;
  
  to process data that includes engine speed data and engine fueling data to create engine gross torque data for the running engine;
  
  to process data related to torque losses due to running of the engine to create engine running torque loss data;
  
  to process engine speed data to create engine acceleration and deceleration data;
  
  to process the engine acceleration and deceleration data with data defining a moment of inertia attributable to the rotating member and engine mechanism coupled to that member to create data measuring inertial torque;
  
  to algebraically add the inertial torque data to, and subtract the engine running torque loss data from, the engine gross torque data to create engine net running torque data; and
  
  to process the engine net running torque data and engine speed data according to a filter algorithm that compensates the engine net running torque data for engine speed; and
  
  the transmission shifting is controlled by the speed-compensated engine net running torque data.
- View Dependent Claims (13, 14, 15, 16)
- - 13. A motor vehicle as set forth in claim 12 wherein the processor processes the engine net running torque data according to the algorithm:
    - $y (k) = \frac{x (k) + x (k - 1) - y (k - 1) * (1 - \frac{2 τ}{dt})}{(1 + \frac{2 τ}{dt})}$ $where; \begin{matrix} y (k) = TQ_FILT (the curent value of the filter algorithm \\ output) \end{matrix}$ $\begin{matrix} y (k - 1) = TQ_FILT previous (the previous value of the filter \\ algorithm output) \end{matrix}$ $\begin{matrix} x (k) = TQ_TRANS (the current value of the input to the \\ filter algorithm) \end{matrix}$ $\begin{matrix} x (k - 1) = TQ_TRANS previous (the previous value of the \\ input to the filter algorithm) \end{matrix}$ $\begin{matrix} dt = BG_TIMER (the time step since last execution of the \\ algorithm) \end{matrix}$ $\begin{matrix} τ = TQ_TAU (the filter algorithm'"'"' s time constant compensated \\ for engine speed) . \end{matrix}$
  - 14. A motor vehicle as set forth in claim 12 wherein the processor processes data related to torque losses due to running of the engine to create engine running torque loss data comprises processing data relevant to torque loss due to engine air pumping, data relevant to torque loss due to operation of engine-driven accessories, data relevant to torque loss due to engine oil pumping, and data relevant to engine running friction to create engine air pumping torque loss data, engine-driven accessory torque loss data, engine oil pumping torque loss data, and engine running friction torque loss data, and
- 15. A motor vehicle as set forth in claim 12 wherein the processor processes data that includes engine speed data and engine fueling data to compensate the engine gross torque data for changes in altitude.
- 16. A motor vehicle as set forth in claim 12 wherein the processor processes data that includes engine speed data and engine fueling data to compensate the engine gross torque data for changes in engine air-fuel ratio.

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Current Assignee
International Engine Intellectual Property Company, LLC (Volkswagen AG)
Original Assignee
International Engine Intellectual Property Company, LLC (Volkswagen AG)
Inventors
Lack, Adam C.
Primary Examiner(s)
Black, Thomas G.
Assistant Examiner(s)
To, Tuan C

Application Number

US09/911,266
Publication Number

US 20030017911A1
Time in Patent Office

701 Days
Field of Search

701/51, 701/102, 701/101, 701/54, 477/120, 477/124, 477/109, 477/123, 477/113, 477/110, 477/111, 477/115, 123/205, 123/406.23, 123/406.24, 123/406.25, 123/406.26, 123/406.3, 123/406.36, 123/406.46, 123/406.47, 475/125, 475/126, 475/257
US Class Current

701/51
CPC Class Codes

B60W 2510/0695   Inertia

F02D 2200/1004   Estimation of the output to...

F02D 2200/1006   Engine torque losses, e.g. ...

F02D 2250/18   Control of the engine outpu...

F02D 41/1497   With detection of the mecha...

Engine torque calculation

First Claim

12 Assignments

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Abstract

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16 Claims

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Engine torque calculation

First Claim

12 Assignments

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Abstract

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