Purge valve driving control device
US12322544B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 11, 2022 |
| Grant date | Jun 3, 2025 |
| Priority date | — |
| Expiry date | Mar 11, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F2007/1866
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
Provided is a purge valve driving control device capable of detecting abnormality by utilizing an existing circuit as much as possible while securing resolution and accuracy of solenoid resistance value detection. A battery voltage is applied to one end of a solenoid 1a through a first connection terminal 3a, and the other end is connected to a second connection terminal 3b. In a driver circuit 120, a drive transistor 4 and a shunt resistor 5 are connected in series between the second connection terminal 3b and a ground, and an overcurrent detection circuit 11 that enables detection of occurrence of an overcurrent in the drive transistor 4 on the basis of a voltage of the shunt resistor 5 is provided, and a microcomputer 110 is configured to be able to determine presence or absence of occurrence of battery short-circuit equivalent to an electrical short-circuit state of the first connection terminal 3a and the second connection terminal 3b on the basis of an output of the overcurrent detection circuit 11.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.