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Tandem master cylinder with electromagnetic position sensors for each piston

  • US 4,914,916 A
  • Filed: 04/04/1988
  • Issued: 04/10/1990
  • Est. Priority Date: 04/04/1988
  • Status: Expired due to Fees
First Claim
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1. A hydraulic master cylinder assembly comprising:

  • (A) a cylinder formed of a nonferrous material and defining an axial bore;

    (B) first and second pistons, each including a portion formed of a ferrous material, mounted for stroking reciprocal joint axial movement in said bore an coacting with said cylinder to define first and second pressure chambers in said cylinder;

    (C) first and second discharge ports in said cylinder communicating respectively with said first and second pressure chambers so that pressurized fluid is delivered through said first and second discharge ports in response to stroking axial movement of said pistons in said bore; and

    (D) sensing means including a magnetic sensor associated with each piston, operative to continuously sense the individual instantaneous axial positions of each piston in said bore as the pistons undergo reciprocal stroking movement in said bore and to continuously generate first and second signals respectively and continuously representing the instantaneous sensed position of said first and second pistons in said bore.

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