Hydraulic steering with enhanced failure prevention

Abstract

The invention relates to a hydraulic steering device (10) hydraulically connecting a steering cylinder (12) to a supply system (14), wherein the supply The system (14) is operably hydraulically connected to said steering cylinder (12) through a steering assembly (16), and said supply system (14) is additionally operatively connected hydraulically to said steering cylinder (12) through a flow regulating valve arrangement (24). said steering cylinder (12) such that an auxiliary flow connection (26) bypassing said main flow connection (22) can be formed; through said auxiliary flow connection (26), at least one first The working chamber (28) and a second working chamber (30) can be supplied with hydraulic fluid independently of each other, and wherein said flow regulating valve means (24) comprises a plurality of independently actuatable valves (32, 34, 36, 38, 61, 63, 68, 70), through which at least the first feed (40) and the first return (42) for the first working chamber (28) and the first return (42) for the first A second feed (44) and a second return (46) of the two working chambers (30), and wherein said hydraulic steering device (10) further comprises means for at least partially shutting off said auxiliary flow connection (26) at least one shut-off valve (48, 66) and also includes at least one electronic control unit (50) designed to output , 63, 68, 70) of the actuation current, the hydraulic steering device (10) includes a device (56) for measuring and comparing at least two actuation currents, and the device (56) is also designed to be compared in the presence of A deviation of the actuating current at least moves the shut-off valve (48, 66) to the shut-off position. The inventive subject matter also includes a method for protecting a hydraulic steering device.

Description

technical field [0001] The invention relates to a hydraulic steering device. Background technique [0002] Hydraulic steering systems, for example in the field of vehicles, are basically known to those skilled in the art. Such a hydraulic steering device is described, for example, in DE 10 2011 112 625 A1. This is common to the subject of the present invention. [0003] The core component of this hydraulic steering unit is the steering cylinder which is hydraulically connected to the supply system. In this case, the supply system is operatively connected hydraulically to the steering cylinder via the steering assembly in the sense of a main flow connection. The steering cylinder may be actuated, for example, by the steering assembly via a manual steering wheel. Furthermore, it is known in the case of hydraulic steering systems of this type to form auxiliary flow connections for the mechanized or automatic actuation of the steering cylinders. To this end, the supply syst...

AI Technical Summary

Problems solved by technology

[0004] However, with this control technique, there are often residual control deviations that cannot be automatically eliminated

The result is a residual deviation of the lane of a vehicle with hydraulic steering from the actual desired lane

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