A method for controlling an internal combustion engine. Target ignition times for the individual cylinders are given by an engine control device through trigger signals transmitted to the ignition control device. After receiving a trigger signal, the ignition control device activates the ignition device associated with this trigger signal to effect ignition in the respective cylinder. The ignition control device stores a firing order in which an ignition is to be cyclically effected in the individual cylinders, and it is checked whether trigger signals for all cylinders are received in the stored firing order, and if not, a substitutional ignition time is calculated for the at least one cylinder for which no trigger signal has been received, from at least two trigger signals for the cylinders or one of the remaining cylinders, and the respective ignition device or ignition devices are activated according to the calculated substitutional ignition time.

A control method, a control device, an electronic device and a storage medium for engine operation are provided. The method includes: obtaining a rotational speed and a temperature of an engine at a current time and determining a reference value of the control parameter of the engine based on the rotational speed and the temperature; detecting a composite operating state of the engine at the current time and determining an offset of the control parameter corresponding to each operating state in the composite operating state; adding the reference value of the control parameter and the offset of the control parameter corresponding to each operating state in the composite operating state to obtain a final value of the control parameter; and controlling the engine at the current time according to the final value of the control parameter.

A control method, a control device, an electronic device and a storage medium for engine operation are provided. The method includes: obtaining a rotational speed and a temperature of an engine at a current time and determining a reference value of the control parameter of the engine based on the rotational speed and the temperature; detecting a composite operating state of the engine at the current time and determining an offset of the control parameter corresponding to each operating state in the composite operating state; adding the reference value of the control parameter and the offset of the control parameter corresponding to each operating state in the composite operating state to obtain a final value of the control parameter; and controlling the engine at the current time according to the final value of the control parameter.

A method for extracting characterizing features from an ion current trace retrieved from spark plugs of cylinders of an internal combustion engine, comprises the steps of: i. dividing the ion current signal into crank angle subintervals; 5 ii. calculating a measure of ion current in each crank angle subinterval; and iii. Performing a calculation on the measure of ion currents from different subintervals such that the result of the calculation is dimension free. Further it relates to a method of monitoring combustion processes where a plurality of ion current signals from a number of spark plugs (4A, 4B) are 10 retrieved and used in combination.

Systems and methods for improving fuel economy in vehicles such as Class 8 trucks are provided. In some embodiments, signals indicating states of the powertrain are collected and used to generate fuel rate optimization values. Fuel rate optimization values may indicate a difference between optimum fuel flow rates and actual fuel flow rates during a vehicle drive cycle. Recorded fuel rate optimization values may be used to compare different vehicle configurations during testing, and may also be used to evaluate vehicle performance during real-world operation.

Systems and methods for improving fuel economy in vehicles such as Class 8 trucks are provided. In some embodiments, signals indicating states of the powertrain are collected and used to generate fuel rate optimization values. Fuel rate optimization values may indicate a difference between optimum fuel flow rates and actual fuel flow rates during a vehicle drive cycle. Recorded fuel rate optimization values may be used to compare different vehicle configurations during testing, and may also be used to evaluate vehicle performance during real-world operation.

Implementations are disclosed herein that relate to a nitrous oxide (NOS) injection system. An example provides an engine control unit (ECU) comprising a logic machine and a storage machine holding instructions executable by the logic machine to selectively enable NOS injection from a NOS reservoir into an engine based on engine temperature, operational transmission gear ratio, barometric pressure, NOS reservoir pressure, engine speed, and intake throttle position.

Systems and methods for improving fuel economy in vehicles such as Class 8 trucks are provided. In some embodiments, signals indicating states of the powertrain are collected and used to generate fuel rate optimization values. Fuel rate optimization values may indicate a difference between optimum fuel flow rates and actual fuel flow rates during a vehicle drive cycle. Recorded fuel rate optimization values may be used to compare different vehicle configurations during testing, and may also be used to evaluate vehicle performance during real-world operation.

A method for extracting characterizing features from an ion current trace retrieved from spark plugs of cylinders of an internal combustion engine, comprises the steps of: i. dividing the ion current signal into crank angle subintervals; 5 ii. calculating a measure of ion current in each crank angle subinterval; and iii. Performing a calculation on the measure of ion currents from different subintervals such that the result of the calculation is dimension free. Further it relates to a method of monitoring combustion processes where a plurality of ion current signals from a number of spark plugs (4A, 4B) are 10 retrieved and used in combination.

In a control apparatus for an internal combustion engine, The ignition timing in a rich-cylinder is corrected toward a retardation side from a theoretical-MBT such that the torque generated in the rich-cylinder exceeds a torque generated in the rich-cylinder at the theoretical-MBT, and the ignition timing in a lean-cylinder is corrected toward an advancement side from the theoretical-MBT such that the torque generated in the lean-cylinder exceeds a torque generated in the lean-cylinder at the theoretical-MBT, when a temperature raising process is being executed, and the ignition timing in the rich-cylinder is corrected further toward the retardation side such that the torque generated in the rich-cylinder becomes equal to or smaller than a maximum theoretical generated torque and equal to or larger than the torque generated in the lean-cylinder at the theoretical-MBT, when the temperature raising process is being executed and the engine is in a low-load operating state.