Patent ID: 7237759

Claim:
An air intake control device for a diesel engine comprising: a throttle valve installed in an air intake passage of the engine, wherein the throttle valve is rotatable over a throttle valve rotatable range between a throttle valve-fully open position which defines a maximum intake air volume and an endpoint position; a motor for controlling the throttle valve to control intake air in response to signals from a control unit; a return spring for exerting a spring force on the throttle valve toward the throttle valve-fully open position; and a bypass for supplying air downstream from the throttle valve by bypassing the throttle valve when the throttle valve is in said endpoint position, wherein the bypass is arranged so as to define a throttle valve-minimum intake air volume position between said throttle valve-fully open position and said endpoint position at which an opening area is smaller than an opening area at said endpoint position, said opening area at the endpoint position including an opening area of said bypass at the endpoint position.