发明名称 |
Control system for a tractor power lift system. |
摘要 |
<p>A control system for a tractor hydraulical power lift system having an electrohydraulic actuator (22) coupled to a main hydraulic valve (21), wherein the improvement comprises: a feedback electronic control circuit including circuit means for mathematically combining a plurality of transducer generated signals into a command signal. The command signal comprises the output signal of a first differential summing device (32) receiving a first input signal for a control handle transducer (24) from which is substracted a second input signal produced as the output of a signal mixer that combines input signals from a rockshaft transducer (25), a draft selector transducer (26) and a draft load transducer (27). The command signal and a signal from a transducer (28) coupled to the electrohydraulic actuator are fed into a differential summing device (49) that has as its output an error signal representing the actual and desired positions of an implement to be positioned by the power lift system.</p><p>The control circuit includes a sample-and-hold unit (51) adapted to receive the error signal. A clock logic means transmits the error signal at predetermined times as determined by a sampling frequency clock (52) from the sample-and-hold unit (51) to the electrohydraulic actuator.</p> |
申请公布号 |
EP0043725(A1) |
申请公布日期 |
1982.01.13 |
申请号 |
EP19810303076 |
申请日期 |
1981.07.06 |
申请人 |
FORD MOTOR COMPANY LIMITED;FORD-WERKE AKTIENGESELLSCHAFT;FORD FRANCE SOCIETE ANONYME;FORD MOTOR COMPANY |
发明人 |
RAJAGOPAL, GANESH;BASRAI, HABIL S. |
分类号 |
A01B63/00;A01B63/111;B62D49/02;B66F9/24;E02F3/85;G05D3/12;(IPC1-7):01B63/114 |
主分类号 |
A01B63/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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