公开(公告)号：US20190028088A1

公开(公告)日：2019-01-24

申请号：US15658093

申请日：2017-07-24

Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

Inventor： Tiziana BELVEDERE ,  Angelo ARGENTO ,  Stefano NIEDDU

IPC: H03K3/012 ,  H03K17/30 ,  H03K5/24 ,  H02M1/08

Abstract: Methods and apparatus are provided for a high current control strategy and a low current control strategy using fixed threshold values and variable threshold values. An electrical quantity related to an electrical current which is to be switched is received on an input. The electrical quantity related to the electrical current is compared with a predefined first fixed threshold value in a first comparator for determining a first logical state. The electrical quantity is compared with a first variable threshold value in a second comparator for determining a second logical state. The electrical current is switched between an ON state and an OFF state in response to a switching signal on an output terminal when the electrical quantity of the electrical current meets the first variable threshold value. The first logical state, the second logical state and the switching signal provided at the output terminal vary the first variable threshold value.

公开(公告)号：US20190211772A1

公开(公告)日：2019-07-11

申请号：US15865706

申请日：2018-01-09

Applicant: GM Global Technology Operations LLC

Inventor： Paolo CASASSO ,  Tiziana BELVEDERE ,  Umberto FERRARA ,  Luca CHIAPUSSO

IPC: F02D41/40 ,  F02D41/38

Abstract: An injector driver module includes: a first node that is connected to a first terminal of a fuel injector; a first switch configured to, when closed, connect a first potential of a battery to the first node; a second switch configured to, when closed, connect a second potential that is greater than the first potential to the first node; a second node that is connected to a second terminal of the fuel injector; and a third switch configured to, when closed, connect a ground potential to the second node. A switch control module is configured to, starting at a target injecting timing for a fuel injection event of the fuel injector: maintain the third switch closed; and switch the second switch using a pulse width modulated (PWM) signal having (i) a duty cycle that is less than 100 percent and (ii) a predetermined frequency.