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A supercharging system for an internal combustion engine, consisting of a positive displacement air pump mechanically driven by the engine, and an electromagnetic clutch activated during high torque demand operating conditions. The system produces a high torque output in a high torque demand range f

A supercharging system for an internal combustion engine, consisting of a positive displacement air pump mechanically driven by the engine, and an electromagnetic clutch activated during high torque demand operating conditions. The system produces a high torque output in a high torque demand range from a relatively small displacement engine, with economy operation during normal engine operating conditions. A flow modulation control system provides a smooth transition from natural aspiration to supercharged operating conditions and includes a sensing of the pressure drop across the throttle plate and modulation of the supercharger air flow into the engine intake in accordance with the sensed pressure differential. The flow modulation also enables high efficiency supercharging with the engine operating under partial pressure supercharging as required in ascending a grade. The air pump design is a specially configured vane pump in which the vanes are dynamically biased in an axial direction by forces generated during rotation of the air pump vanes enabling the use of a relatively simplified low cost bearing arrangement for the vanes.

대표청구항 ▼

A supercharging system for an internal combustion engine having an air intake with an intake throttle valve disposed therein controlling the flow of air into said air intake, said system comprising: air pump means for receiving air through an inlet and producing a flow of compressed air into said ai

A supercharging system for an internal combustion engine having an air intake with an intake throttle valve disposed therein controlling the flow of air into said air intake, said system comprising: air pump means for receiving air through an inlet and producing a flow of compressed air into said air intake; means mechanically driving said air pump means by said internal combustion engine, said means including clutch means operable to selectively establish drive to said air pump means; clutch control means including means causing said clutch means to be activated in a predetermined operating range of said internal combustion engine and causing said clutch means to be deactivated with said internal combustion engine operating outside of said predetermined range; means establishing natural aspiration into said air intake whenever said compressed air flow from said air pump means into said air intake is below a predetermined level; modulator means responsive to the pressure in the air intake on opposite sides of the intake throttle valve for varying the air flow from said air pump means to said air intake as a function of the pressure differential across said throttle valve, reducing said air flow whenever said pressure differential is above a predetermined maximum level; whereby said supercharging air flow is modulated to provide a transition to maximum air flow upon activation of said clutch means, and to enable less than maximum air flow under part throttle conditions.