Key signal input device, key signal input method and key board
A technology of signal input and input method, which is applied in the field of button boards and button signal input devices, can solve problems such as poor control of the distance between the button circuit board and the panel, button failure, and disadvantages of the button board, so as to avoid button failure and high reliability , to avoid the effect of extrusion
Inactive Publication Date: 2012-01-25
ZOOMLION HEAVY IND CO LTD
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Problems solved by technology
[0003] The purpose of the present invention is to provide a key signal input device, a key signal input method and a key board, which can solve the problem that the key board of the existing construction machinery is not conducive to the placement of components, and the distance between the key circuit board and the panel is not good. Good control, easy to cause problems such as button failure
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[0021] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0022] The technical solution of the present invention is to generate two waveform signals with the same waveform, one of which can be disturbed by the key signal input by the conductive key, and judge whether there is a key signal input by comparing whether the two waveform signals have the same waveform, And output different level signals as judgment results, thereby simulating button triggering and realizing operation control of construction machinery.
[0023] Thus, the present invention provides a key signal input device, such as figure 1 As shown, the input device includes a signal generator 1 and a signal comparator 2, and the signal comparator 2 has a f...
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The invention discloses a key signal input device, a key signal input method and a key board. The key signal input method comprises the following steps of: 1) generating two lines of waveform signals with the same waveform, wherein the waveform of one line of the waveform signals can be interfered by an input key signal and becomes different from the waveform of the other line of the waveform signals; and 2) comparing the received two lines of the waveform signals: judging that the key signal is not input and outputting a first level signal when the waveforms of the received two lines of the waveform signals are same, and judging that the key signal is input and outputting a second level signal which is different from the first level signal when the waveforms of the received two lines of the waveform signals are different. By adopting the key signal input device, key signal input method and key board provided by the invention, the using area of a key circuit can be saved, the reliability is high, and the failure of keys can be effectively avoided.
Description
technical field [0001] The invention relates to construction machinery, in particular to a key signal input device, a key signal input method and a key board for construction machinery. Background technique [0002] In order to realize the operation control of the construction machinery by the operator, the existing construction machinery, such as road paver, excavator, cutting machine, etc., are all provided with a key board, and the key board is directly connected by a light touch switch as a key. Soldered on the button circuit board, and then use oak posts and screws to fix the button circuit board on the installation panel. However, the existing keypads have the following problems: 1. The existing keypads need to press the buttons to realize key triggering. One fixing hole for fixing the light touch switch, thus reducing the use area of the button circuit board, which is not conducive to the placement of components; 2. Since the distance between the button circuit boa...
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IPC IPC(8): H03K17/96H05B37/02
Inventor 陈庆怀袁海吴珂王德胜
Owner ZOOMLION HEAVY IND CO LTD