In the present invention, an internal combustion engine (7) drives a generator (6). The internal combustion engine (7) carries out a standby operation. The standby operation is an operation involving assisting power supply to a drive motor (2). During the standby operation of the internal combustion engine (7), the SoC of a battery (4) is equal to or higher than a predetermined SoC threshold. The operating point of the internal combustion engine (7) during the standby operation is further on a lower-output side than the operating point of the same during the charging of the battery (4). The operating point of the internal combustion engine (7) during the standby operation is an operating point in which the collector pressure of the internal combustion engine (7) is equal to or higher than a predetermined collector pressure threshold. The operating point of the internal combustion engine (7) during the standby operation is within a lean combustion region.

An internal combustion engine includes a crankshaft having a first end and a second end opposite the first end. The crankshaft defines a crank axis and is rotatable about the crank axis. The internal combustion engine also includes a camshaft that defines a camshaft axis and is rotatable about the camshaft axis. The internal combustion engine further includes a cam drive assembly that is operable to transfer rotation from the crankshaft to the camshaft, a balance mass rotatable about the crankshaft, and a balancer drive assembly operable to drive the balance mass through the cam drive assembly.

A system and method for controlling a hybrid power-split transmission of a vehicle involve obtaining measured rotational speeds of an engine and an electric motor of the transmission, wherein the transmission comprises at least two input shafts having a gear set therebetween and an output shaft, wherein one input shaft is coupled to the engine and another input shaft is connected to the electric motor, determining a main torque profile for the electric motor based on a set of operating conditions of the vehicle, calculating a speed difference between the measured rotational speeds of the engine and the electric motor, determining a disturbance torque profile for the electric motor based on the calculated speed difference, and performing closed-loop control of the electric motor based on a combination of the main and disturbance torque profiles to mitigate a disturbance at the output shaft of the transmission.

A control system for reducing drive shaft vibration of an environment-friendly vehicle includes: a drive shaft speed extraction unit that extracts an actual drive shaft speed of a motor and extracts a drive shaft speed from which a forced vibration component that is to be transferred by an engine to the drive shaft is removed; a model speed computation unit that calculates a model speed of the drive shaft; a free vibration computation unit that computes a free vibration component on the basis of deviation between the drive shaft speed and the calculated model speed; and a first torque computation unit that calculates, from the free vibration component, a free vibration reduction compensation torque for reducing the drive shaft vibration.

Methods and systems are provided for an engine. A condition of the engine may be diagnosed based on information provided by signals from a generator operationally connected to the engine and/or other signals associated with the engine. Different types of degradation may be distinguished based on discerning characteristics within the information. Thus, a degraded engine component may be identified in a manner that reduces service induced delay.

The controller is programmed to perform first control that controls a driving force distributor such as to decrease a distribution rate upon satisfaction of a predetermined condition that a frequency of at least one rotation fluctuation of an output member of the drive system, a main drive wheel and a sub drive wheel is within a predetermined area, compared with the distribution rate upon non-satisfaction of the predetermined condition.

A method of generating vehicle control data includes: storing, with a storage device, relationship prescription data; operating, with an execution device, an operable portion of an internal combustion engine; acquiring, with the execution device, a detection value from a sensor that detects the state of the vehicle; calculating, with the execution device, a reward; and updating, with the execution device, the relationship prescription data using update mapping determined in advance, the update mapping using the state of the vehicle based on the detection value, an operation amount used to operate the operable portion, and the reward corresponding to the operation as arguments, and returning the relationship prescription data which have been updated such that an expected profit for the reward calculated when the operable portion is operated in accordance with the relationship prescription data increases.

To inhibit clutch engagement during an engine restart from affecting cooperative regenerative braking control and switching of braking in a hybrid vehicle having a P2 module onboard, a control system for the hybrid vehicle includes an engine, a motor, a K0 clutch, drive shafts, a hydraulic friction brake system, and a controller capable of performing cooperative regenerative braking control. When start of the engine is requested during the cooperative regenerative braking control, the controller performs a first process of transitioning to braking only by the frictional brake system, a second process of raising an engine revolution speed while engagement of the K0 clutch is initiated after completion of transitioning to the braking, and a third process of controlling the engine to resume operating at a timing after the engine revolution speed increases to match a motor revolution speed after the engagement of the K0 clutch is initiated.

A variety of methods and arrangements for reducing noise, vibration and harshness (NVH) in a skip fire engine control system are described. In one aspect, a firing sequence is used to operate the engine in a dynamic firing level modulation manner. A smoothing torque is determined by adaptive control that is applied to a powertrain by an energy storage/release device. The smoothing torque is arranged to at least partially cancel out variation in torque generated by the firing sequence. Various methods, powertrain controllers, arrangements and computer software related to the above operations are also described.

A powertrain control method for a vehicle may include: setting, by a controller, a Noise Vibration Harshness (NVH) characteristic map based on an engine operating point to be used for a control of a powertrain based on a gradient of a road on which the vehicle is running; determining, by the controller, whether the vehicle is shifting; and selecting and performing, by the controller, at least one of a release of a lock-up state of a damper clutch or an additional rise of an engine torque based on whether a current engine operating point belongs to any level among a plurality of NVH levels classified in the NVH characteristic map when the vehicle is not shifting.