Abstract: A method for controlling a vehicle including an internal combustion engine having an idle speed includes controlling the idle speed based on system voltage, and increasing the idle speed when system voltage is low and the vehicle speed status indicates that the vehicle is stationary. In some embodiments, idle speed may ramp up with current demanded engine speed while the vehicle is moving.

Abstract: A diesel engine comprises a combustion-temperature control device for adjusting a combustion temperature of the engine depending on an engine operating condition, and an ignition-delay-duration control device for adjusting an ignition delay duration depending on the engine operating condition. An engine-temperature sensor is provided for detecting an engine temperature. During cold-engine warm-up period, an electronic control unit effectively compensates for both the combustion temperature and the ignition delay duration depending on the engine temperature, to reconcile the slow initial combustion in the early combustion stage and the sharp combustion in the middle or later combustion stage and so as to realize a so-called low-temperature premixed combustion with an increased rate of premixed combustion to diffusion combustion under a condition of low combustion temperatures.

Abstract: A throttle valve (12) is provided in an intake air passage (11) of a throttle body (10) and serves to control the air flows rate that is supplied into a combustion chamber of an internal combustion engine. A valve housing (21) is joined to the throttle body (10). A communication passage (22) is formed in the valve housing (21). A branching side passage (13a) and a joining side passage (13b) are formed in the throttle body 10 and, together with the communication passage (22) in the valve housing (21), form a bypass structure (13) that bypass the throttle valve (12). A valve seat portion (23) is formed on the valve housing (21) in the communication passage (22). A valve (25) is provided in the valve housing (21) and serves to control the opening area of the valve seat portion (23). A lattice (50) is disposed downstream of the valve seat portion (23) in the bypass structure (13).

Abstract: A silencer for an idle air bypass valve in an internal combustion engine includes a grid disposed between the outlet of the idle air bypass valve and the intake manifold. The grid acts to reduce the air velocity entering into the intake manifold which dampens the vibration of a plastic manifold, thereby reducing noise generated.