Method of testing switch design to quantify feel
AssigneeLear Automotive Dearborn, Inc.
InventorsJonathan Dahlstrom, Donald E. Ellison, Richard Ratke
Life of this patent
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Abstract
A method of testing a switch looks at the second derivative of the resistance force to movement. The second derivative is most indicative of the feel the operator will experience when utilizing the switch. It is desirable to keep the second derivative to a minimum for the switch at locations other than end of travel or detent positions. By investigating the second derivative, one is provided with feedback of areas on the switch that might require further investigation or re-evaluation.
Claims7
A method of testing a switch comprising the steps of:
- (1) identifying a switch to test;
- (2) developing a plot of the second derivative of resistance force to movement for said switch;
- and
- (3) investigating spikes in said second derivative plot.
A method of testing a switch comprising the steps of:
- (1) identifying a switch to be tested which is movable between first and second positions;
- (2) developing a plot of resistance force versus movement as said switch moves between said first and second positions;
- (3) taking the second derivative of said plot of said resistance force as said switch moves between said first and second positions;
- and
- (4) investigating spikes in said second derivative plot.
Dependencies are inferred from the claim text.