US 2015/0088387 A1 · POSITION DIAGNOSTIC TEST FOR A SHIFT-BY-WIRE SYSTEM, AND A METHOD THEREOF

Abstract

A position diagnostic test for a shift-by-wire system is provided. The shift-by-wire system includes a shift lever configured to move along a shift path, a first and a second position sensor configured to generate a first and a second position signal, respectively, of the shift lever along the shift path, and a controller configured to receive the first and second position signals. The first position sensor includes a first x-coordinate value and a first y-coordinate value, and the second position sensor includes a second x-coordinate value and a second y-coordinate value. The position diagnostic test includes performing a rationality test on each of the coordinate values. If at least one predetermined condition exists for a particular coordinate value, then it fails the rationality test, and the position signal containing the coordinate value may be disregarded.

Claims19

Dependent claims

A shift-by-wire system for a vehicle comprising:

a shift lever movable along a shift path between a plurality of range positions arranged in a shift pattern;
a first position sensor configured to sense a position of the shift lever along the shift path, and to generate a corresponding first position signal having a first x-coordinate value and a first y-coordinate value;
a second position sensor configured to sense the position of the shift lever along the shift path, and to generate a corresponding second position signal having a second x-coordinate value and a second y-coordinate value;
and
a controller configured to receive the first position signal from the first position sensor and the second position signal from the second position sensor, and to determine if at least one of the first position signal and the second position signal accurately communicates the position of the shift lever.

2 more elements

A position diagnostic test for a shift-by-wire system having a shift lever movable along a shift path, a first position sensor and a second position sensor configured to each sense a position of the shift lever, and to generate a corresponding first position signal and second position signal, respectively, the first position signal having a first x-coordinate value and a first y-coordinate value, and the second position signal having a second x-coordinate value and a second y-coordinate value, the position diagnostic test comprising performing, by a controller, a rationality test for each of a plurality of test coordinate values that include the first x-coordinate value, the second x-coordinate value, the first y-coordinate value, and the second y-coordinate value, wherein any one of the tested coordinate values fails the respective rationality test if at least one predetermined condition exists.

A method for determining a position of a shift lever of a shift-by-wire system along a shift path, the shift-by-wire system also having a first position sensor and a second position sensor configured to each sense the position of the shift lever, and to generate a corresponding first position signal and second position signal, respectively, the first position signal having a first x-coordinate value and a first y-coordinate value, and the second position signal having a second x-coordinate value and a second y-coordinate value, the method comprising:

receiving, by a controller, the first position signal from the first position sensor, and the second position signal from the second position sensor;
performing, by the controller, a rationality test for each of a plurality of test coordinate values that include the first x-coordinate value, the second x-coordinate value, the first y-coordinate value, and the second y-coordinate value;
if both of the tested coordinate values that include the first x-coordinate value and the first y-coordinate value pass the respective rationality test, then determining that the first position signal is accurate;
and
if both of the tested coordinate values that include the second x-coordinate value and the second y-coordinate value pass the respective rationality test, then determining that the second position signal is accurate;
wherein any one of the tested coordinate values does not pass the respective rationality test if at least one predetermined condition exists.

3 more elements

Dependencies are inferred from the claim text.

Position diagnostic test for a shift-by-wire system, and a method thereof

Life of this patent

Position diagnostic test for a shift-by-wire system, and a method thereof

Life of this patent

Abstract

Claims19