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.

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.

Abstract: Technical solutions are described for optimizing current injection profiles used for solenoid injectors, such as during fuel injection. An example fuel injector system includes a solenoid injector and a controller that receives a request for energizing the solenoid for an energizing time. The controller, in response to the requested energizing time exceeding a predetermined threshold, holds an electrical current applied to the solenoid injector at a predetermined minimum holding value for a holding phase. Further, the controller in response to the requested energizing time being less than the predetermined threshold, applies a predetermined peak-current value to the solenoid injector.

Abstract: A method is provided for operating a compression-ignition engine having a combustion chamber. The method includes establishing, via an injection driver, electronic communication with a primary clock configured to generate a primary time signal. The method also includes commanding an injector to introduce into the combustion chamber injections of fuel having respective pulse widths timed using the primary time signal to generate combustion within the combustion chamber. The method additionally includes detecting a loss of the primary time signal and subsequently establishing an electronic communication between the injection driver and an auxiliary clock configured to generate an auxiliary time signal. Furthermore, the method includes commanding the injector to introduce into the combustion chamber a number of injections of fuel having respective pulse widths timed using the auxiliary time signal and thereby continuing combustion within the combustion chamber.

Abstract: A method of operating an internal combustion engine is described, which includes executing a warm up strategy of an engine aftertreatment system, wherein the warm up strategy includes injecting fuel into the engine according to a multi-injection pattern having at least one after injection.

Abstract: A method is provided for controlling the engine torque delivered during engine operation. The method includes, but is not limited to setting a brake torque request value during the engine operation, deriving a request fuel quantity value on the basis of the brake torque request value. The comparison of the value of the brake torque requested with a measured and/or estimated brake torque value allows calculating a brake torque error value, which directly or indirectly modifies the request fuel quantity injected in the engine.