Control system

Details Control system Control system

2005-09-09

2008-10-21

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

C318S798000, C123S478000, C123S479000

Reexamination Certificate

active

07439700

ABSTRACT:
A control system which is capable of avoiding an overloaded state of an actuator without using sensors or the like. An ECU2of the control system1calculates a lift control input U_Liftin to a variable valve lift mechanism50with an algorithm expressed by equations (2) to (5), such that the valve lift Liftin follows up a target valve lift Liftin_cmd, calculates a cumulative value Simot by cumulative calculation of the product of the value Imot of electric current flowing through the variable valve lift mechanism50and a sampling time period Stime, and when SImot≧Simot_J1holds, sets two parameters pole_f_lf and ploe_lf to respective predetermined failure-time parameters pole_f_lf_J1and ploe_lf_J1which cause the lift control input U_Liftin to become smaller than when Simot<Simot_J1holds.

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