method of controlling the vehicle

Abstract

A method is disclosed for controlling a vehicle having a drive train comprising a variable displacement engine having a crankshaft connected through a transmission to the drive wheels of the vehicle and an auxiliary engine connected directly to the engine crankshaft and to an energy storage device. machine. When the torque demand and the engine speed are within the first threshold (T out ) outside the defined outer range, the engine mode switches from cylinder deactivation (VDE) mode to normal mode, and when the torque demand and engine speed are within the outer range and determined by the second threshold (T in ) within the defined internal range, the engine mode switches from normal to VDE mode. When operating within a torque demand and engine speed band lying between the two thresholds, auxiliary machines draw energy from the energy storage device and supplement output torque from the engine if operating in VDE mode, and if the engine is in normal mode Operation then derives torque from the engine crankshaft to recharge the energy storage device.

Description

Technical field [0001] The present invention relates to a method of controlling a vehicle having a drive train comprising a variable displacement engine of a drive wheel coupled to a vehicle through a transmission. Background technique [0002] The term "variable displacement engine" is used herein to refer to an engine having a cylinder disabled, that is, one or more cylinders can selectively block the ignition and block an engine from providing output power. The cylinder deactivation can be performed by controlling fuel supply and in some cases in a variety of ways in various ways in a variety of ways in a spark ignition and diesel engine. The use of the engine's displacement is not very important to the present invention, and it is not necessary to describe in detail herein. [0003] When the vehicle is equipped with a variable displacement engine, only the specific area of ​​the speed / load map is more efficient in the cylinder stop. [0004] In the drawings figure 1 It is a...

AI Technical Summary

Problems solved by technology

[0005] Under dynamic driving conditions, especially when the engine is operating around the threshold of the VDE deactivation mode, i.e. at figure 1 Around the range marked in , frequent switching between VDE and normal (i.e. all cylinders firing) modes may occur

In addition to such frequent mode changes being unsettling to the driver, they wear down engine components and affect engine durability

Countermeasures needed to improve robustness will have an impact on system cost

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