Key signal input device, key signal input method and key board
A technology of signal input and input method, applied in the field of key signal input device and key board, can solve the problems of key failure, disadvantage of key board, and difficult control of the distance between key circuit board and panel, so as to achieve high reliability and avoid key failure. , to avoid the effect of squeezing
Inactive Publication Date: 2012-09-19
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: 1, generating two waveform signals with the same waveform, wherein one of the two waveform signals can be disturbed by an inputted key signal to be different from the other waveform signal in waveform; and 2, comparing the received two waveform signals: under the condition that the received two waveform signals are the same in waveform, judging that no key signal is inputted and outputting a first level signal, and however, under the condition that the received two waveform signals are different in waveform, judging that a key signal is inputted and outputting a second level signal different from the first level signal. The key signal input device, the key signal input method and the key board, provided by the invention, have the advantages that the use area of a key circuit can be saved, the reliability is high, and failure of a key can be avoided effectively.
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 王琪
Owner ZOOMLION HEAVY IND CO LTD