Method for determining the differences between non-uniform cylin

Details Method for determining the differences between non-uniform cylin Method for determining the differences between non-uniform cylin

1996-09-13

1998-01-20

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including means responsive to instantaneous change in engine...

731173, F02D 4104, F02D 4132

Patent

active

057091927

ABSTRACT:
Relative differences between cylinder torque moments are individually determined for each cylinder in a multicylinder internal combustion engine in which individual cylinders may be switched off. The torque moment differences are ascertained indirectly when the engine is subject to inner and outer resistance moments and to the inertia moments of all masses to be accelerated. Under these conditions the crankshaft r.p.m. is measured and the r.p.m. signal is split into components for the individual cylinders by applying the superposition principle of linear systems. The first r.p.m. is determined when all cylinders work. The second r.p.m. is determined with all cylinders but one working and the second r.p.m. is deducted from the first r.p.m. Gradually one cylinder after the other is switched off and the respective differences in the r.p.m. are ascertained. These r.p.m. differences are allocated to the ignition compression and are compared with a difference r.p.m. of a reference cylinder. This comparing provides a torque difference for each cylinder relative to the reference cylinder. The results are then treated statistically, for example by the least square method to determine numerical values which are converted into closed loop control signals for controlling injection fuel quantities for each cylinder so that each cylinder will contribute the same moment component to the total torque moment of the engine.

REFERENCES:
patent: 4357662 (1982-11-01), Schira et al.
patent: 4475511 (1984-10-01), Johnson et al.
patent: 4495920 (1985-01-01), Matsumura et al.
patent: 4535406 (1985-08-01), Johnson
patent: 4667634 (1987-05-01), Matsumura et al.
patent: 4697561 (1987-10-01), Citron

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