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Industrial Research And Consultancy Centre
Patent
Control Methods and Systems for Reducing Startup Time in a Gyroscope
Abstract

This invention pertains to control methods and systems designed to reduce the startup time of gyroscopes, specifically MEMS gyroscopes, used in various electronic and mechanical devices. Traditional gyroscopes, which rely on Automatic Gain Control (AGC) and Phase-Locked Loop (PLL) circuits, suffer from relatively long startup times, delaying the measurement of angular rates and increasing energy consumption. This invention introduces a pulse controller that works in conjunction with the AGC and PLL circuits to accelerate the startup process. The pulse controller emits a signal that, when combined with the input control drive signal, quickly excites the proof mass of the gyroscope, enabling it to reach its steady-state oscillation frequency and amplitude in a shorter time. This method prevents overshooting of the oscillation amplitude, ensuring the gyroscope operates efficiently and safely. The reduced startup time promotes energy efficiency and enhances the performance of devices that require rapid and accurate angular rate measurements, such as smartphones, aircraft, and vehicles. The proposed solution is easily integrable with existing gyroscope control systems, offering a cost-effective and flexible enhancement to current technology.

Figure (1) Circuit diagram of a system of a gyroscope in drive 15 mode with a pulse controller

Problem Statement

Gyroscopes, particularly MEMS gyroscopes, have a relatively long startup time from a point of rest to reach steady-state operation. This delay can negatively impact devices requiring instant angular rate measurements and can lead to significant energy consumption.

Uniqueness of the Solution
  • Reduced Startup Time: The integration of a pulse controller significantly reduces the time required for the gyroscope to reach its steady-state operation. 
  • Compatibility: The method can be easily implemented alongside existing AGC and PLL circuits without extensive modifications. 
  • Avoidance of Overshoot: Proper voltage control ensures the oscillation amplitude does not exceed desired levels, preventing potential damage. 
  • Energy Efficiency: Faster startup times lead to lower energy consumption, as gyroscopes spend less time in high-power states. 
  • Flexibility: The solution is applicable to both MEMS and mechanical gyroscopes.
Prototype Details
  • MEMS Gyroscope: 10 Hz to 1 kHz 
  • AGC (Automatic Gain Control) Circuit: Gain range 0.1 - 100 
  • PLL (Phase-Locked Loop) Circuit: Lock range 10 Hz - 1 kHz 
  • AGC Signal (Vi): 0.1V - 3.3V 
  • PLL Signal (Ω): 10 Hz - 1 kHz
Current Status of Technology

Demonstration and validation in lab environment.

Technology readiness level

4

Societal Impact

Reducing the startup time of gyroscopes improves the performance of various electronic devices and mechanical systems that rely on accurate and rapid angular rate measurements. This can lead to better user experiences and energy efficiency in consumer electronics and advanced navigational systems.

Relevant Industries, Domains and Applications

Consumer Electronics (smartphones, tablets, smartwatches), Aerospace (aircrafts, satellites), Maritime (ships), Automotive (vehicle navigation systems).

Geography of IP

Type of IP

Application Number

202221008504

Filing Date
Grant Number

409434

Grant Date
Assignee(s)
Indian Institute of Technology Bombay
**This IP is owned by IIT Bombay**