Internal Combustion Piston Engines TRIZ Cases

Segmented SCR catalyst monitoring applies active and passive diagnostics to separate devices.

Radial current flow through segmented ceramic linear portions reduces temperature gradients, enabling rapid heating for efficient exhaust gas purification.

A secondary air supply system switches between two paths to adjust airflow based on engine state.

A compact nozzle design with angled end surfaces and spaced holes for fuel injection.

Joule heating on an upstream catalyst substrate reduces cold-start light-off time and lowers platinum group metal loading in compression ignition engines.

Secondary air injection and Joule heating raise the temperature of a downstream particulate filter, allowing soot oxidation at cold start conditions.

Non-intersecting passages isolate wastegate exhaust from turbocharger flow, resolving durability trade-offs in high-output engines.

An integrated particulate filter transfers exhaust heat to a secondary fluid line for energy recovery.

A controller delays O2 sensor diagnosis during high hydrocarbon regions to prevent false diagnostic errors in exhaust systems.

A reductant delivery system uses a sensor and controller to maintain pressurized air pressure for consistent injection.

A vehicle control system monitors torque outtake patterns to determine the most appropriate driving mode for current conditions.

RF sensors detect urea deposits via dielectric shifts, triggering regeneration only when needed to preserve fuel economy and SCR efficiency.

Insulated enclosure isolates high-temperature exhaust devices from sensitive external electronics, preventing thermal damage during steady-state operation.

Concentric disc springs in the valve stem suppress vibration to ensure even seating on the valve seat without restricting swing motion.

Nesting the SCR catalyst inside the CUC housing maintains optimal operating temperatures while preventing CO purification interference.

Variable geometry vane accelerates wet exhaust flow to generate centrifugal force, separating entrained cooling water from marine exhaust gases.

A cylindrical air distributor uses a partial throttle ramp to rebalance swirl levels across engine cylinders.

Elongated electrodes align parallel to exhaust flow, reducing radial footprint while maintaining catalytic conversion effectiveness.

A gas-permeable liquid-impermeable membrane covers a pressure equalization opening within a fastening sleeve to maintain housing interior integrity.

Oxide films on aggregate particles bind with cordierite to resolve oxidation resistance and thermal shock trade-offs.

A segmented catalytic article uses a barrier layer to separate nickel-copper and platinum group metal components.

A battery management unit monitors temperature and swelling to generate control signals that block power supply to the starter motor.

Offset close-running lines on a shutter disc minimize clearance and leakage while simplifying manufacturing of rotary piston devices.

Sequential expansion chambers attenuate intake noise frequencies while minimizing pressure losses in the engine system.

A pressure relief valve selectively reduces exhaust manifold back pressure, protecting EGR control valves from extreme environments and premature wear.

A camshaft phaser adjusts valve timing to reduce compression pulses during fuel cut-off in hybrid vehicles.

A vehicle sound attenuation controller adjusts exhaust tuning valves and engine sound enhancement systems to manage cabin acoustics.

A stacked plate evaporator uses a channel with an increasing flow cross section to manage expanding liquid volume during evaporation.

A dual pass intercooler circulates compressed air through two heat exchange stages within a compact depth.

Contouring the wastegate side wall shifts the flow choking area to the throat, resolving non-linear actuation issues for linear control.

Dual NOx sensors estimate ammonia slip to decouple cross-sensitivity, stabilizing feedback control and improving NOx conversion efficiency.

A conical wastegate valve with lateral cutouts controls exhaust-gas flow through a turbine housing.

Merging heating and control functions into one cable reduces wiring complexity near the catalytic converter.

A controller determines reductant injection debt when flow exceeds capacity and injects compensation flow to maintain total mass.

Eccentric tapered port cylinder head suppresses non-contributory volume at port openings, enhancing combustion efficiency without increasing block diameter.

Segmented compression and power pistons enable simultaneous multi-mode operation, resolving device complexity issues in air hybrid engines.

A porous resin disk unit in a return valve allows fuel to pass through fine holes while maintaining stable positioning.

An electrical monitoring system detects catalytic converter theft by tracking resistance continuity, avoiding heavy mechanical deterrents.

Three series-connected heat exchangers raise combined heat and power transfer medium temperatures above 100°C using engine oil, cooling water, and exhaust gas.

Radial stacking of asymmetric dual volutes inhibits pressure leakage between scrolls, improving fuel economy and reducing exhaust back pressure.

A two-stage turbocharger module integrates low-pressure and high-pressure compressors on perpendicular axes within a shared housing.

Segmented chambers with synchronized cams resolve the trade-off between continuous rotation and structural complexity in rotary engines.

Liquid fuel serves as the control fluid for gas injectors, eliminating separate hydraulic systems and reducing installation space.

A vehicle control device generates a wave-like travel speed pattern by alternating acceleration and free run phases to manage fuel consumption.

Segmented fillers equalize thermal expansion stress to prevent cracking at junctions.

Controller manages transmission states using road inclination data to stabilize engine restarts during idle stop events.

Porous sorption structures retain liquid reductants to enable controlled release and efficient evaporation at low exhaust gas temperatures.

An SCR catalyst system adjusts ammonia dosage rates based on absolute exhaust pressure measurements to optimize catalytic conversion.

A two-stroke engine uses a step-type piston and dedicated oil pump to deliver lubricant directly to moving parts.

Dynamic pressure reduction during non-dosing periods minimizes reducing agent leakage and crystallization risks in exhaust systems.