US 8,474,258 B2 · Stoichiometric compression ignition engine with increased power output

Abstract

A stoichiometric compression ignition engine has a turbocharger coupled to it so that the exhaust from the engine feeds the turbine and the compressor provides combustion air past a throttle and intercooler to the engine intake manifold. An exhaust after treatment device is positioned before the exhaust of the engine. A power turbine is connected in parallel relation to the turbocharger turbine and is controlled by a valve to operate the power turbine whenever either the turbocharger compressor boost or the turbocharger turbine back pressure exceed given limits. The power turbine is connected by a power transmission device to either couple to the engine output or to an electrical generator. An EGR loop may be driven by a pump also connected to the power turbine to lower in cylinder pressures.

Claims33

Dependent claims

A method of operating an air breathing, fuel consuming compression ignition internal combustion engine comprising the steps of:

operating the reciprocating compression ignition engine at near stoichiometric fuel/air conditions, thus producing products of combustion with an excess of energy over that needed to produce a power output from the reciprocating compression ignition engine;
driving a turbocharger turbine with said products of combustion from the reciprocating compression ignition engine;
driving a turbocharger compressor with the turbocharger turbine for supplying pressurized air to the reciprocating compression ignition engine;
selectively driving a power turbine in parallel relation to the turbocharger turbine when a preselected level of one of boost pressure from the turbocharger compressor and back pressure said products of combustion upstream of the turbocharger turbine is exceeded to at least add power to one of the power output of the reciprocating compression ignition engine and an auxiliary load device.

1 more element

A working machine comprising:

a frame;
a plurality of wheels mounted to said frame for the working machine moving over ground;
a transmission mounted to said frame and driving at least two of the plurality of wheels;
an air breathing, fuel consuming, reciprocating compression ignition internal combustion engine mounted to said frame and operating at near stoichiometric fuel/air conditions and producing products of combustion with an excess of energy and producing a power output at least connected to said transmission;
a turbocharger having a turbine receiving said products of combustion from said reciprocating compression ignition engine and a compressor driven by said turbine for supplying pressurized air to said reciprocating compression ignition engine;
a power turbine connected in parallel with said turbocharger turbine to also receive said products of combustion from said reciprocating compression ignition engine, said power turbine connected to at least one of the power output of said IC engine and an auxiliary load device, and;
a valve operable to selectively permit passage of said products of combustion across said power turbine when a preselected level of one of boost pressure from said turbocharger compressor and back pressure upstream of said turbocharger turbine is exceeded.

4 more elements

Dependencies are inferred from the claim text.

Stoichiometric compression ignition engine with increased power output

Life of this patent

Stoichiometric compression ignition engine with increased power output

Life of this patent

Abstract

Claims33