Joystick device with redundant sensor processing

• US 7,757,579 B2
• Filed: 07/14/2005
• Issued: 07/20/2010
• Est. Priority Date: 08/30/2004
• Status: Active Grant

• Current Assignee: Danfoss Power Solutions Inc. (Danfoss A/S)
• Original Assignee: Sauer-Danfoss Incorporated (Danfoss A/S)
• Inventors: Bloch, Jesper O.
• Primary Examiner(s): Hannon; Thomas R
• Assistant Examiner(s): Johnson; Phillip A
• Application Number:
  US11/160,892
• Publication Number:
  US 20060044269A1
• Time in Patent Office: 1,832 Days
• Field of Search: 744/71.XY, 345/161, 463/36, 463/38, 273/148.B
• US Class Current: 74/471.0XY
• CPC Class Codes: G05G 2009/04774 with additional switches or sensors on the handle
• CPC Class Codes: G05G 5/05 Means for returning or tending to return controlling members to an inoperative or neutral position, e.g. by providing return springs or resilient end-stops G05G5/28 takes precedence
• CPC Class Codes: G05G 5/06 for holding members in one or a limited number of definite positions only G05G5/005, G05G5/03, G05G5/05, G05G5/28 take precedence
• CPC Class Codes: G05G 9/047 the controlling member being movable by hand about orthogonal axes, e.g. joysticks for switches H01H25/04
• CPC Class Codes: Y10T 74/20201 Control moves in two planes

Abstract

A joystick device having a grip assembly pivotably connected to a base assembly. The base assembly having sensing elements that detect the movement of the grip assembly as it pivots about the base assembly. Disposed within the base assembly and the sensing elements is a microprocessor. The microprocessor verifies an output signal prior to transmitting to a remote controller.

Claims

1. A joystick device, comprising:

a grip assembly pivotably connected to a base assembly;

sensing elements disposed within the base assembly that detect position of the grip assembly as it pivots about the base assembly;

said sensing elements disposed about a given axis, such that one sensing element gives an increasing output and another sensing element gives a decreasing output; and

a microprocessor disposed within the base assembly, wherein the microprocessor verifies an output signal from each of the sensing elements before transmitting each output signal.

2. The device of claim 1 wherein a second microprocessor is disposed within the grip assembly and is connected to the base microprocessor.

3. The device of claim 1 wherein when the microprocessor detects an inconsistency in one of the outputs the joystick is locked at electrical neutral.

4. The device of claim 1 wherein the microprocessor sends an output signal that shuts down the joystick when a failure is detected.

5. The device of claim 1 wherein the microprocessor sends a valid output signal and a warning signal.

6. The device of claim 1 wherein the microprocessor sends a neutral position value when the microprocessor detects a fault condition in any non-neutral position.

7. The device of claim 1 wherein the microprocessor sends a position value for a first sensing element and a warning signal if a fault condition is detected.

8. A joystick device, comprising:

a grip assembly pivotably connected to a base assembly;

sensing elements disposed within the base assembly that detect position of the grip assembly as it pivots about the base assembly;

said sensing elements disposed about a given axis, such that one sensing element gives an increasing output and another sensing element gives a decreasing output; and

a microprocessor disposed within the base assembly wherein the microprocessor verifies an output signal from each of the sensing elements before transmitting each output signal; and

wherein the microprocessor compares the output signals from the sensing elements by summing them together and comparing the sum against a predetermined given value to check if the sum is within a valid range.

9. The device of claim 8 wherein a deviation of the sum is allowed in the valid range.

10. The device of claim 9 wherein a fault message is sent if the sum drops out of the valid range.

11. A joystick device, comprising:

a grip assembly pivotably connected to a base assembly;

sensing elements disposed within the base assembly that detect position of the grip assembly as it pivots about the base assembly;

said sensing elements disposed about a given axis, such that one sensing element gives an increasing output and another sensing element gives a decreasing output; and

a microprocessor disposed within the base assembly wherein the microprocessor verifies an output signal from each of the sensing elements before transmitting each output signal wherein the microprocessor compares the output signals from the sensing elements by summing them together from one end point to a mid-point and from an other end point to the mid-point, and compares the sums against a pre-determined constant value.

12. The device of claim 11 wherein if one of the sums falls outside of a valid range the sum is considered to be a fault condition.