An engine idle control method of an off highway vehicle. The method including the steps of: detecting a static load on the engine; detecting a dynamic load on the engine; determining if the static load is below a predetermined static level; determining if the dynamic load is less than a predetermined range; and engaging an auto-idle feature dependent upon both of the determining steps being true.

The disclosure relates to a watchdog for monitoring a processor. The watchdog sends messages to the processor which subsequently sends back its own status information and optionally the status information of system components and the test results thereof at predetermined times as answers to the watchdog. The watchdog comprises at least one result memory in the form of, e.g., a shift register in which the watchdog records the history of the answers and examines patterns in erroneous answers. The recording is generated by a trigger event which can be the reception of individual answers and/or the end of scheduled reception time periods. According to the patterns, signalizations are carried out on the processor and/or other system components, which optionally introduce measures and adapt their structure and/or the implemented programs and/or the priority of said implementations.

The disclosure relates to a watchdog for monitoring a processor. The watchdog sends messages to the processor which subsequently sends back its own status information and optionally the status information of system components and the test results thereof at predetermined times as answers to the watchdog. The watchdog comprises at least one result memory in the form of, e.g., a shift register in which the watchdog records the history of the answers and examines patterns in erroneous answers. The recording is generated by a trigger event which can be the reception of individual answers and/or the end of scheduled reception time periods. According to the patterns, signalizations are carried out on the processor and/or other system components, which optionally introduce measures and adapt their structure and/or the implemented programs and/or the priority of said implementations.

A system includes a processing circuit having a memory coupled to one or more processors, the memory storing instructions therein that, when executed by the one or more processors, cause the one or more processors to: receive engine operational data, the engine operational data indicative of at least one engine operational condition; determine, based on the engine operational data, an estimated exhaust temperature; generate, based on the estimated exhaust temperature and a finite time horizon, a forecasted exhaust temperature; correct the forecasted exhaust temperature based on a downpipe model to generate a first inlet temperature profile corresponding to a first component of the exhaust aftertreatment system; and generate, based on the first inlet temperature profile, a second inlet temperature profile corresponding to a second component of the exhaust aftertreatment system.

An illustrative embodiment of a fuel injector control system includes a driver that is configured to supply electrical power to a fuel injector. A controller is configured to control the driver by implementing a predetermined sequence of a plurality of states for an injection cycle. The plurality of states each include parameters for supplying electrical power to the fuel injector. The controller selects one of the states to implement as a next one of the states in the sequence based on a characteristic of an activation signal and information indicative of the state corresponding to the characteristic of the activation signal.

An illustrative embodiment of a fuel injector control system includes a driver that is configured to supply electrical power to a fuel injector. A controller is configured to control the driver by implementing a predetermined sequence of a plurality of states for an injection cycle. The plurality of states each include parameters for supplying electrical power to the fuel injector. The controller selects one of the states to implement as a next one of the states in the sequence based on a characteristic of an activation signal and information indicative of the state corresponding to the characteristic of the activation signal

A system includes a processing circuit having a memory coupled to one or more processors, the memory storing instructions therein that, when executed by the one or more processors, cause the one or more processors to: receive engine operational data, the engine operational data indicative of at least one engine operational condition; determine, based on the engine operational data, an estimated exhaust temperature; generate, based on the estimated exhaust temperature and a finite time horizon, a forecasted exhaust temperature; correct the forecasted exhaust temperature based on a downpipe model to generate a first inlet temperature profile corresponding to a first component of the exhaust aftertreatment system; and generate, based on the first inlet temperature profile, a second inlet temperature profile corresponding to a second component of the exhaust aftertreatment system.

An illustrative embodiment of a fuel injector control system includes a driver that is configured to supply electrical power to a fuel injector. A controller is configured to control the driver according to a predetermined sequence of states for an injection cycle. The plurality of predefined states each include parameters for supplying electrical power to a fuel injector. Each of the states has a corresponding plurality of test parameters. At least one of the test parameters is a target parameter for the state. During each of the states, the controller determines whether at least one of the test parameters is met and determines how to control the driver for a subsequent portion of the injection cycle based on which of the test parameters is met.

A system includes a processing circuit having a memory coupled to one or more processors, the memory storing instructions therein that, when executed by the one or more processors, cause the one or more processors to: receive an estimated exhaust temperature; generate, based on the estimated exhaust temperature, a forecasted exhaust temperature; modify the forecasted exhaust temperature based on a downpipe model to generate a first temperature profile corresponding to a first component of an exhaust aftertreatment system; and generate, based on the first temperature profile, a second temperature profile corresponding to a second component of the exhaust aftertreatment system.

Implementations described herein relate to utilizing discrete transient local state space models to modify an output from a steady state NO.sub.x estimation model to provide a final estimated NO.sub.x value. An engine operating space, defined by a speed and injection quantity map, is subdivided into several discrete local state spaces and a transient model is developed for each discrete state space to output a NO.sub.x estimation correction value. The transient models may be a regression model or the transient model may be an empirical map of data values. The NO.sub.x estimation correction value modifies a steady state NO.sub.x value to calculate the final NO.sub.x estimated value. The final NO.sub.x estimated value is then output to another component, such as a controller as an input for controlling one or more components of an engine, an aftertreatment system, and/or a diagnostic system.