초록 ▼

A multi-cylinder Otto cycle internal combustion direct compound engine for motor vehicles with an exhaust-gas turbocharger providing direct turbo compounding upon the engine control module receiving a speed signal indicating that the vehicle is traveling in a predetermined cruise-speed mode. Upon re

A multi-cylinder Otto cycle internal combustion direct compound engine for motor vehicles with an exhaust-gas turbocharger providing direct turbo compounding upon the engine control module receiving a speed signal indicating that the vehicle is traveling in a predetermined cruise-speed mode. Upon receipt of the signal the module turns-off each fuel injector feeding a second group of the cylinders, while maintaining fuel injection to a first group of cylinders and fully opening the electronic intake-air induction throttle. As a result the unfired second group of cylinder pistons are driven solely by compressed inlet-air pressure during the time the vehicle travels at or above a predetermined light-load cruising-speed, while positive pumping work occurs in all the cylinders. The engine thus conserves fuel during light load cruising speed while maintaining low pollutant emissions.

대표청구항 ▼

[ I claim:] [1.]1. A multi-cylinder Otto cycle direct compound internal combustion engine for a motor vehicle comprising:a compressor of an exhaust-gas turbocharger draws-in and compresses outside air, for delivery, via an electronic throttle valve and an intake manifold, to first and second groups

[ I claim:] [1.]1. A multi-cylinder Otto cycle direct compound internal combustion engine for a motor vehicle comprising:a compressor of an exhaust-gas turbocharger draws-in and compresses outside air, for delivery, via an electronic throttle valve and an intake manifold, to first and second groups of engine cylinders;the first group of cylinders are connected to a first exhaust manifold for delivery of their exhaust-gas to drive a turbine of the turbocharger, via an electronic by-pass valve;the by-pass valve being operable, by pressure sensing means of a power-train control module, to direct part or all of the exhaust-gas to drive the turbine, and whereby the exhaust-gas from the first group of pistons is exited, through first catalytic converter means, to the atmosphere;the second group of cylinders are connected to a second exhaust manifold, whereby during the time the second group of cylinders are fired their exhaust-gas is exited, through second catalytic converter means, to the atmosphere; andthe control module adapted for regulating a fuel injector for each of the engine cylinders, whereby upon speed sensor means of the control module indicating the vehicle speed has reached a predetermined light-load cruise-speed mode, wherein the control module deactivates each second group cylinder fuel injector, resulting in each second group cylinder being powered solely by compressed air boost pressure, via the intake manifold, such that the engine achieves increased fuel efficiency during operation of the vehicle in the cruising-speed mode.