Turbo-lag compensation system for an engine

Abstract

A boost system for an engine, comprising an engine having at least a cylinder; a fuel injector coupled to said cylinder; a compression device coupled to said engine; a compressed air storage device coupled to said compression device and configured to deliver compressed air to an air flow amplifier device located in the inlet air passageway to said cylinder; and a controller to adjust an amount of fuel injection to account for variation of air delivered to said cylinder from said flow amplifier device.

Description

BACKGROUND AND SUMMARY [0001] Engines may use boosting devices, such as turbochargers, to increase engine power density. Thus, under steady state operation, smaller displacement, turbocharged engines can produce power equivalent to larger displacement engines. However, under dynamic driving conditions, the smaller turbocharged engine may have less transient performance than a larger, naturally aspirated engine. [0002] As one example, when a turbocharged engine is operating at low load, the turbocharger speed is low and intake manifold pressure is low. When the engine load is suddenly increased, there may be a lag before the turbocharger speed increases and intake manifold pressure rises. This delay may be referred to as “turbo-lag.” During this delay, the engine power or torque output may be less than desired value, and less than the steady state available output. [0003] One approach that attempted to provide intake manifold pressure boost with minimal delay is described in SAE pape...

AI Technical Summary

Benefits of technology

[0001] Engines may use boosting devices, such as turbochargers, to increase engine power density. Thus, under steady state operation, smaller displacement, turbocharged engines can produce power

Problems solved by technology

However, under dynamic driving conditions, the smaller turbocharged engine may have less transient performance than a larger, naturally aspirated engine.

With such a system, boost compensation is allegedly unnecessary.

However, the inventors herein have recognized disadvantages with each of the above approaches.

Further, the system required two tanks of about 12 inches in diameter each, thus requiring significant packaging space in the vehicle.

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