Variable compression ratio engine and method for operation thereof

A method for operating an engine, comprising:

• during engine start-up operation,
• opening a bypass valve in a turbine-generator bypass conduit coupled upstream and downstream of a turbine-generator in a bleed manifold receiving combustion charge from a cylinder bleed valve coupled to a cylinder head, to direct combustion charge through the turbine-generator bypass conduit, the cylinder bleed valve distinct from an exhaust valve;
• and
• subsequent to engine start-up operation,
• closing the bypass valve to direct combustion charge to the turbine-generator.

An engine system in an engine, comprising:

• an engine cylinder having an intake valve receiving air from an intake manifold and an exhaust valve releasing combustion charge into an exhaust manifold;
• an exhaust gas recirculation (EGR) passage recirculating exhaust gas from the exhaust manifold to the intake manifold;
• a cylinder head including a cylinder bleed valve coupled to a bleed manifold, the bleed manifold including an igniter coupled upstream of a turbine-generator, an outlet of the bleed manifold coupled to the EGR passage;
• a bypass conduit coupled upstream and downstream of the igniter and the turbine-generator;
• a bypass valve positioned in the bypass conduit;
• and
• a controller with computer readable instructions stored on non-transitory memory for:
• adjusting operation of the bypass valve based on engine temperature.