Importance

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Abstract

An electrohydraulic steering system for machines includes manual steering and automatic steering (autopilot) modes which can be activated by a switch (3). The system has a hydraulic steering cylinder (6) for displacement of the steerable wheels, at least one sensor (7) for determining the wheel angle actual values (.delta..sub.w), at least one electrically operated hydraulic control valve (5) which regulates admission of hydraulic fluid to the steering cylinder (6) and at least one automatic steering signal transmitter (2) for generating electrical steering signal nominal values (.delta..sub.s2) for the wheel angles. An electronic control and analysis device (4) is fed the automatically generated steering signal nominal values (.delta..sub.s2) and the wheel angle actual values (.delta..sub.w). The control and analysis device (4) determines an electrical trigger signal (4S) for the hydraulic control valve (5) from the wheel angle actual value (.delta..sub.w) and the automatically generated steering signal nominal value (.delta..sub.s2) . A steering signal transmitter (1) is provided for the manual steering, which from a manual steering movement generates a corresponding electrical steering signal nominal value (.delta..sub.s1) which is also fed to the control and analysis device (4). Depending on which steering mode is active, the control and analysis device (4) analyses the manual or automatic steering signal nominal values.

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First Claim