Internal-Combustion Engine Testing TRIZ Cases

A heat transfer model calculates exhaust temperature at the aftertreatment inlet using turbine outlet data and thermal parameters.

A glow plug system adjusts supply line resistance to match heater temperatures across cylinders.

Modulate exhaust gas sensor reference voltage during deceleration fuel shut off to separate ambient humidity from positive crankcase ventilation hydrocarbons.

Segmented sensors measure individual cylinder exhaust to resolve measurement precision versus information loss, enabling accurate air/fuel ratio calculation.

A quick connect testing jig uses a drive mechanism to exert compressive force on vehicle exhaust outlets.

A computer uses engine speed and coolant temperature data to estimate battery aging without additional sensors.

A misfire detecting device compares rotation fluctuation amounts between active cylinders and reference values from stopped cylinders to identify combustion anomalies.

An outboard motor engine uses a learning completion flag to enable misfire detection control only after operational parameters are established.

A flexible printed circuit board electrically couples sensing elements to connector terminals within a hollow combustion engine plug body.

An exhaust gas analyzer calculates oxygen concentration using infrared detection of carbon dioxide alongside engine recirculation parameters.

A gas sensor tubular body uses a stripe-like recessed surface to fill powder compact for sealing.

A gain correction factor adjusts NOx sensor readings based on discrete age levels and constituent concentrations.

A controller supplies low and high voltage to an ion sensor to increase current above a threshold.

Rich lean period analysis from oxygen sensors detects misfires in general purpose engines, preventing three-way catalyst damage.

Measuring discharge current from the magnetic coil determines the injector's closed position before ignition, preventing uncontrolled combustion.

A vehicle air filter monitoring system computes remaining useful life using pressure differential sensors and a control module.

A misfire detection device separates overlapping torque fluctuations from actual engine faults during regeneration processes.

A knock determination device filters vibration waveforms by removing noise portions exceeding a reference magnitude to isolate engine knocking signals.

Adjusting torque detection thresholds based on ignition timing prevents erroneous misfire diagnoses while reducing processing load.

Acoustic emission sensors capture elastic waves from stressed turbine casings to detect small cracks before they cause noticeable vibrations.

A NOx sensor offset diagnostic system runs during stable engine idle or after-run conditions to reduce signal noise.

A control apparatus determines exhaust gas sensor activation using temperature rise and elapsed time conditions.

A multi-mass flywheel simulation model resolves prototype scarcity by evaluating spring forces and friction via time-stepping algorithms.

Optical scanning measures maximum wear depth against tolerance limits, reducing material wastage and machine downtime during remanufacturing.

A multi-cylinder engine system monitors periodic gas pressure fluctuations to verify intake valve activation status.

A controller calculates exhaust gas conversion efficiency to detect particulate matter filter damage using existing sensors.

A crankcase pressure sensor detects internal pressure changes to identify faults in the positive crankcase ventilation breather line.

A variable averaging filter adapts its period to firing fractions, processing engine speed signals.

Segmented signal processing reduces calculation load while maintaining accuracy across all operating conditions.

Exhaust gas pressure sensors measure actual cylinder pressure to detect valve actuation faults, resolving monitoring challenges during skip fire operation.

A controller estimates variable displacement hydraulic pump outputs using torque and inertia data.

Controller detects oxygen signal lag and increases heater current in specific regions to recover responsiveness without exhaust gas modeling.

A dual-channel exhaust sampling system mixes engine gases with ambient air in separate zones before conveying the diluted mixture through a shared tunnel.

A detecting electrode uses a base-metal material covered by a passivation film.

A control arrangement estimates noise levels in NOx sensor output signals during start-up intervals to predict upcoming failures before they occur.

Nested shields prevent liquid water from reaching electrodes while maintaining exhaust gas flow for accurate particulate matter sensing.

A torque model estimates expected net engine torque to identify valve actuation faults.

Predicts particulate matter sensor response time using quadratic curve fitting on steady-state data.

An enlarged diameter housing section redirects water flow away from the heater, preventing damage and maintaining heating efficiency.

A dual filter exhaust gas analyzer switches flow paths and applies pulse purge to maintain continuous measurement.

A misfire classification method uses in-cylinder temperature signals to identify combustion anomalies.

Comparing analog and digital rail pressure signals detects sensor malfunctions, preventing mechanical overloading and unauthorized engine tuning.

Compensates for tolerance and aging-induced voltage-lambda characteristic curve deviations by dynamically adjusting air-fuel mixture composition.

A misfire detecting device calculates a torque index value from crank angle sensor output to identify combustion faults.

A combustion state parameter calculation method uses detection values from unaffected in-cylinder pressure sensors to reconstruct missing data.

Frequency band isolation from NOx sensor signals resolves ammonia cross-sensitivity ambiguity in active SCR systems.

A crank angle correction device converts detected signals into a periodic function for discrete Fourier transform analysis to calculate angular velocity and acceleration.

Simultaneous opacity and nitrogen oxide detection in a shared enclosure resolves Euro 5 precision requirements without separate calibration equipment.

A misfire determination device detects extreme values of combustion state parameters to isolate the current combustion event.