Handwheel position measurement system and method

Patent metadata

Field	Value
Publication number	US-11505238-B2
Application number	US-202016807953-A
Country	US
Kind code	B2
Filing date	Mar 3, 2020
Priority date	Mar 3, 2020
Publication date	Nov 22, 2022
Grant date	Nov 22, 2022

Abstract

A position measurement system for a steering system includes a steering shaft. The position measurement system also includes a worm gear coupled to the steering shaft. The position measurement system further includes a worm in meshed engagement with the worm gear, the worm driven by a motor. The position measurement system yet further includes a first sensor operatively coupled to the worm to detect an angular position of the worm and the motor that drives the worm. The position measurement system also includes a driving gear coupled to the steering shaft. The position measurement system further includes a spur gear in meshed engagement with the driving gear. The position measurement system yet further includes a second sensor operatively coupled to the spur gear to detect an angular position of the spur gear.

First claim

Having thus described the invention, it is claimed:

1. A position measurement system for a steering system comprising:
a steering shaft;
a worm gear coupled to the steering shaft;
a worm in meshed engagement with the worm gear, the worm driven by a motor;
a first sensor operatively coupled to the worm to detect an angular position of the worm and the motor that drives the worm;
a driving gear coupled to the steering shaft and located on a first side of the worm gear;
a single spur gear in meshed engagement with the driving gear, the single spur gear located on the first side of the worm gear wherein the position measurement system does not include a second spur gear on a second side opposite the first side of the worm gear; and
a second sensor operatively coupled to the spur gear to detect an angular position of the spur gear.

2. The position measurement system of claim 1 , further comprising a disk operatively coupled to the worm, wherein the first sensor is operatively coupled to an outer diameter of the disk.

3. The position measurement system of claim 1 , wherein the first sensor is operatively coupled to an end of the worm.

4. The position measurement system of claim 1 , wherein one full revolution of the steering shaft results in one full revolution of the spur gear.

5. The position measurement system of claim 1 , wherein one full revolution of the steering shaft corresponds to 22.3333 revolutions of the worm.

Assignees

• Steering Solutions Ip Holding

Inventors

• Yang Kun
• Longuemare Pierre C
• Pattok Eric D
• Kidder Keith A

Classifications

• B62D15/0215

  by measuring on the steering column · CPC title

• B62D3/04

  of worm type · CPC title

• B62D15/0235 Primary

  by measuring or deriving directly at the electric power steering motor · CPC title

• B62D15/021

  Determination of steering angle · CPC title

• B62D5/0463

  calculating assisting torque from the motor based on driver input · CPC title