Anti-log power amplifier for reversible D.C. motor in automotive steering controls
US4471280A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 1983 |
| Grant date | Sep 11, 1984 |
| Priority date | — |
| Expiry date | May 6, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P7/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An anti-log power amplifier for energizing a reversible electric motor of an electrically assisted power steering system for an automotive vehicle. The power amplifier has a preamplifier which amplifies the output signal of a torque sensor detecting the torque applied to the vehicle's steering wheel, an anti-log signal generator exponentially modifying the amplified output signal, a pulse width modulator converting the exponentially modified signal to a pair of complementary pulse width signals, and a pair of bridged power amplifiers for energizing the reversible electric motor in response to the complementary pulse width signal. The bridged power amplifiers are further responsive to the exponentially modified signal for increasing the electrical power delivered to the reversible electric motor under high torque loads.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.