United States Patent
US Patent 4936277: System for monitoring and/or controlling multiple…
US 4936277 · granted 1990-06-26
Abstract
Engine crankshaft speed signal, comprising pulses produced by a toothed wheel and sensor, has portions monitored to develop separate instantaneous cylinder associated power output vector signals for each engine cylinder. Engine knock is detected by comparing actual variations in each cylinder power signal with expected variations. Each vector cylinder power signal is multiplied by different first and second weighting vector signals to provide first and second scalar signals indicative of cylinder performance with respect to first and second different cylinder performance criteria, respectively. These scaler signals are compared to each other and a balancing of cylinder power is achieved by adjusting the amount of fuel delivered to each individual cylinder. Preferably, fuel adjustment is implemented such that the average fuel delivered to the cylinders prior to adjustment, determined in accordance with exhaust pollution level, will equal the average fuel delivered after adjustment. Knock detection is provided without using any additionall knock sensor since the existing crankshaft speed sensor signal is used. The generated individual cylinder power vector signals, by use of different weighting vectors, allow detection of several different faults or other performance criteria for each cylinder. Balancing cylinder power is achieved while fuel consumption is maintained in accordance with desired exhaust pollution levels.
| Patent Number | 4936277 |
|---|---|
| Title | System for monitoring and/or controlling multiple cylinder engine performance |
| Filed | 1988-12-19 |
| Granted | 1990-06-26 |
| Inventor(s) | Deutsch; Robert W., Potter; David O. |
| Assignee | Motorola, Inc. |
| Number of Claims | 90 |
Abstract
Engine crankshaft speed signal, comprising pulses produced by a toothed wheel and sensor, has portions monitored to develop separate instantaneous cylinder associated power output vector signals for each engine cylinder. Engine knock is detected by comparing actual variations in each cylinder power signal with expected variations. Each vector cylinder power signal is multiplied by different first and second weighting vector signals to provide first and second scalar signals indicative of cylinder performance with respect to first and second different cylinder performance criteria, respectively. These scaler signals are compared to each other and a balancing of cylinder power is achieved by adjusting the amount of fuel delivered to each individual cylinder. Preferably, fuel adjustment is implemented such that the average fuel delivered to the cylinders prior to adjustment, determined in accordance with exhaust pollution level, will equal the average fuel delivered after adjustment. Knock detection is provided without using any additionall knock sensor since the existing crankshaft speed sensor signal is used. The generated individual cylinder power vector signals, by use of different weighting vectors, allow detection of several different faults or other performance criteria for each cylinder. Balancing cylinder power is achieved while fuel consumption is maintained in accordance with desired exhaust pollution levels.
Claim 1
For an engine having multiple separate cylinders each intended for sequentially providing, during a cylinder-associated power cycle separate from the power cycles associated withother cylinders, a driving force to common driven mechanical member, a system for monitoring and/or controlling engine performance comprising: means for developing separate power output signals for each of said cylinders, each of said power output signals representative of and associated with the driving force provided by an associated cylinder to the driven member and having amagnitude indicative of such provided driving force attributable to said associated cylinder, said magnitude varying over the associated power output cycle; first means for multiplying each of said power output signals by a first weighting factor to obtain a first product signal, associated with each cylinder, representative of each cylinder's performance over its associated power cycle; first means for comparing each of said cylinder-associated first product signals to a selected reference level to determine each cylinder's performance with respect to a first performance criteria; second means for multiplying each of said power outpu
Claims
90 totalFor an engine having multiple separate cylinders each intended for sequentially providing, during a cylinder-associated power cycle separate from the power cycles associated withother cylinders, a driving force to common driven mechanical member, a system for monitoring and/or controlling engine performance comprising: means for developing separate power output signals for each of said cylinders, each of said power output signals representative of and associated with the driving force provided by an associated cylinder to the driven member and having amagnitude indicative of such provided driving force attributable to said associated cylinder, said magnitude varying over the associated power output cycle; first means for multiplying each of said power output signals by a first weighting factor to obtain a first product signal, associated with each cylinder, representative of each cylinder's performance over its associated power cycle; first means for comparing each of said cylinder-associated first product signals to a selected reference level to determine each cylinder's performance with respect to a first performance criteria; second means for multiplying each of said power outpu