Patent · US Active

Motor control strategy for a hydraulic camshaft adjuster having a mechanical central lock

US8342144B2 · kind B2 · utility

7Cited by

6References

5Claims

0Family size

Assignee

Schaeffler Technologies AG & Co. KG · DE

Inventors

Michael Busse · Herzogenaurach, DE
Lutz Witthoeft · Herzogenaurach, DE

Key dates

Filing date	Oct 27, 2008
Grant date	Jan 1, 2013
Priority date	—
Expiry date	Dec 21, 2029

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02D2041/001
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A motor control strategy for a hydraulic camshaft adjuster. The motor control strategy has a mechanical central lock which in turn has at least one rotor and one stator, between which hydraulically loadable chamber A and chambers B are provided. Locking pistons supported in an axially displaceable manner are provided in the rotor for the mechanical central lock. A hydraulic system and an electrically controllable solenoid valve are provided. The valve is powered in a controlled manner by a motor control device, which receives an “ignition off” signal; the motor being turned off, and at least one signal for current angular position of the camshaft adjuster, which compares the angular position to at least one zone definition stored in the motor control device, forms control commands from the same, and transmits said the control commands to the electric solenoid valve.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.