Gearing Control TRIZ Cases

By adjusting swashplate angle from speed and hydraulic pressure, this case limits deceleration load and oil heating in hydrostatic transmissions.

An elastic preloaded locking element blocks a drivetrain shaft with movement clearance, cutting actuator force and packaging space in electric motor drive units.

Dual servo control of pump and motor swash plates cuts shift shock and engine stall risk, helping work vehicles hold steady speed.

An auxiliary-powered pawl engages only below speed or acceleration limits, reducing lock stress and preventing roll-away during power faults.

Segmented closed-loop control switches modes by shift-element position to cut force spikes, speed shifting, and reduce transmission wear.

Pre-engaging a transmission ratio while deferring final engagement helps handle multiple driver shift requests with less delay and fewer unnecessary operations.

A dual-detector capacitive shift panel resolves PR mid-position ambiguity by prioritizing P over R for safer transmission range selection.

Coordinated clutch overlap and HST speed adjustment smooth HMT stage shifts, reducing sudden speed changes and travel system load.

A single actuator drives both the clutch and parking lock to cut control complexity, weight, and delay in electric-drive vehicles.

Virtual control position mapping keeps torque and speed continuous across gear shifts in mobile working machines while preserving full control resolution.

Target motor torque offsets AMT drag-induced inertial torque, improving gear disengagement smoothness while limiting power interruption.

Output-end magnetic angle sensing bypasses gear backlash to improve rotary actuator position detection and shift control robustness.

Multiple sensor readings are cross-checked before switch-state voting to identify failed sensors and avoid erroneous shifter position decisions.

A limited traction force curve and continuously adjusted gearbox ratio help graders prevent wheel spin under rising grading loads.

When P, N, D, and R buttons overlap, this control logic holds a non-drive shift state first to prevent false starts and wrong gear selection.

A branched assist cam shaft releases the park pawl reliably in drum transmissions while reducing parts and preserving manual operation.

Electronic control predicts relative speed and angle to avoid tooth-to-tooth dog clutch engagement, cutting wear, shocks, and shift delay.

Relative speed and angle control aligns dog clutch teeth before engagement, cutting shift shock, wear, and delay in EV gearboxes.

Spaced Hall detection elements and signal correction improve wear-free transmission position sensing while reducing actuator magnetic interference.

A longitudinal distribution gearbox splits one traction motor across front and rear axles, cutting installation space while retaining differential and ratio functions.

Rear wheel slip triggers hydraulic pressure transfer to the same-side front wheel, adding torque only when traction drops on loose or icy roads.

A four-position sliding sleeve lets a differential switch between connected, locked, disconnected, and parking modes to cut losses and simplify coupling.

When a rear wheel overspeeds, hydraulic pressure is routed to the same-side front wheel to restore traction without a heavy driven front axle.

A four-position sliding sleeve selectively couples, locks, disconnects, or parks a half-shaft to cut drivetrain losses and simplify the differential.

Two pumps at different pressures shorten transmission clutch fill time and improve mode transitions through phased electro-hydraulic control.

Closed-loop engine speed control keeps working machines at target speed while matching power-split gearbox capacity utilization for better efficiency.

A shift sensor and alarm warn when the CVT is not in LOW at startup, helping avoid early clutch engagement and rider push feeling.

Travel lever detection stabilizes main pump flow during turns, helping left and right crawlers change speed smoothly for better maneuverability.

A solenoid pilot valve raises usable pressure from the coolant circuit, letting the locking piston actuate reliably without extra pumps.

ABS-triggered transmission disconnect lets hydrostatic road machines brake by wheel grip while avoiding hydraulic inertia and wheel lock.

A manual clutch and input-shaft brake rotor let a vehicle roll with low force when power is off while preserving braking.

Net tractive effort and pedal change let the transmission switch to an economy shift schedule quickly without waiting for engine data.

A driver-activated constant-gear hold prevents unwanted EV transmission shifts on inclines and direction changes, improving drivability and comfort.

Using gearbox position sensor signals, this case triggers throttle, fuel, and ignition control for quick clutch-less shifts without extra sensors.

A user hold input keeps a constant transmission gear during slope and direction changes, reducing unwanted shifts and power cut-offs.

A molded encoder magnet on a support pin replaces adhesive joining, cutting cost and preventing detachment under high acceleration.

An asymmetric pushed surface and offset rollers keep the shift lever slider stable, reducing collision noise during button unlocking.

Paddle shift input logic enables direct switching among non-control, auto, and manual modes without extra confirmations or steps.

Relief pressure is set to target HST output, limiting rapid torque rise from load fluctuations and improving ride comfort in work vehicles.

A face gear and worm mechanism with a magnetic target and Hall sensor enables compact drivetrain actuation and precise automatic gear positioning.

A common assembly body aligns the shift body, moving portion, and detector to improve shift-position accuracy and simplify assembly.

Compensating torque is calculated from drivetrain twist angle and torsional stiffness to release a parking lock smoothly with less jolt and noise.

Precomputed motion profiles regulate shift element position, velocity, and acceleration to cut gear impact noise and avoid jamming.

Separate battery and switching power paths cut ECU power loss while keeping predriver control stable during battery terminal disconnect.

Motor-controlled torque aligns EV transmission engagement parts to reduce shift noise, wear, and hard disengagement under load.

Automated release bolt control adjusts parking brake spring compression from air-pressure status and inputs, avoiding manual release risks.

Multiple topography-based control profiles are compared to cut fuel use while keeping vehicle speed changes smooth and acceptable to drivers.

Wireless paddles and a UDS-linked computing module add manual gear shifting to automatic transmissions without extensive wiring changes.

Motor direction reversal during shift-sleeve actuation aligns transmission teeth for reliable stationary gear changes in commercial vehicles.

Controllable hydraulic cross-coupling shifts torque between wheels to counter downhill lateral drift and improve utility vehicle stability.

A single actuator moves both the clutch and parking lock element, cutting control complexity and weight while maintaining reliable wheel locking and torque transfer.

A single motor, clutch, and rotary-to-linear translator sequence park lock and disconnect states to prevent unintended EV axle movement.

A secure embedded controller isolates gear selection from networked infotainment, preserving accurate gear display and blocking tampering.

By switching pump and motor capacities at a set vehicle speed, this HMT expands towing-force and travel-speed range with fewer gear stages.

A coaxial dual-planetary layout and shared connection member widen CVT speed range while cutting shaft count, size, and transmission losses.

A drop-in sleeve, piston, spring, and plug restore transmission signal pressure in worn valve body bores without modifying the valve body.

Generator feedback is used to adjust engine or motor speed in hydraulic power systems, reducing output variation from non-linear conversion.

A CVT control strategy shifts pulley ratio during lock-up clutch engagement to cancel drive shaft return movement and reduce vibration.

Separating hydraulic pumps with dedicated electric motors cuts idle drag losses in pile drivers and drilling rigs while improving low-load efficiency.

A single servomotor drives both a locking sleeve and pawl, enabling compact switching between differential lock, parking lock, and neutral.

A laterally pulled roller-and-guide-plate assembly actuates the pawl with better packaging efficiency, strength, and reliable park gear engagement.

Distinct sounds, loads, and strokes let one compact shift assembly separate drivetrain and non-drivetrain controls to avoid mistaken operation.

A three-sector actuation cam cuts shaft rotation below 180° to speed gear shifting while holding stable end positions with less angular sensitivity.

A speed-based hydraulic motor displacement strategy smooths vehicle reversal, reducing jerks and engine over-revving in work vehicles.

Limiting hydraulic machine pivot speed during reversal helps prevent cavitation and protects the hydrostatic drive from pressure shocks.

Aligned 3D Hall sensors on AMT shift rods detect external magnetic fields from shared signal changes, preserving accurate gear position sensing.

Absolute gear angle comparison detects parking pawl rattling more reliably and avoids false alarms from drive train vibrations.

A removable shift-knob display integrates computing, media, navigation, and feedback functions without adding separate in-car controls.

When manual shift input stops, the controller reverts to automatic mode unless upshift suppression conditions indicate the driver still intends manual control.

A saddle-and-clamp gearshift connection spreads load across multiple fasteners to prevent fatigue failure and keep shifting reliable.

Load-factor-based prioritization lets each power participant adjust requested power in real time, simplifying mobile machine energy control.

Offset fixing surfaces and a flexible blade simplify shaft-blocking assembly while preserving strength in tight EV transmission spaces.

A sprag stopper and tapered parking rod cam prevent ratcheting damage and preserve parking function on gradient roads.

Sensor-based lever adjustment balances upshift and downshift travel to match rider foot geometry and improve shifting comfort and reliability.

Detecting high-pressure changes lets hydrostatic drives calibrate valve control limits accurately without direct sensors or full-load testing.

An ECU blocks throttle in shift-by-wire dead zones until gear engagement is confirmed, preventing grinding noise and gear misalignment.

Periodic air discharge from a sub oil pump keeps hydraulic actuation responsive during travel without continuous pump operation.

PCB-based rotation monitoring keeps a sphere shifter seated at its completion position and reverses the motor when sticking prevents full travel.

Adaptive CVT upshift control uses accelerator release speed and turbine rpm to keep engine speed aligned with steering power demand.

External spring loading lets a claw clutch engage quietly and reliably in tooth-on-tooth positions without extra clutch sensors.

Negative-acceleration safety logic decouples one or both transmission clutches to prevent windup power loops and unintended hard braking.

Dual actuator modules automate lateral and longitudinal shifting, then hand control back instantly if failure or driver intervention occurs.

Actual vehicle speed feedback corrects hydrostatic motor settings during drive mode, improving traction-drive calibration accuracy without complex setup.

An integrated U-plate with formed legs replaces bushings and many screws to cut tolerance chains and keep solenoid valve clamping force consistent.

A cam-and-spring shifting mechanism absorbs gear misalignment in multi-speed power tools, enabling smoother speed changes and less internal damage.

Hydraulic pulley thrust is varied by rotation speed and ratio to cut friction losses while preventing endless-member slip at low speed.

One motor drives both parking lock and clutch shifting through a cam drum, cutting hydraulic parts, cost, and energy use in hybrid transmissions.

Turbine RPM feedback trims hydraulic switching oil pressure after excessive speed drop, reducing shift shock without slowing response.

Gradient-specific switching maps use vehicle speed and accelerator input to return temporary manual shifting to automatic mode more naturally.

Threshold-based neutral delay control distinguishes intentional N selection from pass-through shifting to avoid temporary driving force loss.

Dual contact sensors and sensor actuators detect gearshift movement in two degrees of freedom without costly Hall sensors or complex software.

A blocking ring with conical friction surfaces delays claw engagement until speed synchronization, cutting shift noise and wear.

Target-angle control keeps a bistable gear shifter motor from sticking in the second steady state during fast D-to-R or D-to-N shifts.

Valve body and separator plate changes disable forward sprag loading in D4, reducing sprag stress in modified 4L60/65/70 transmissions.

Multiple power-split clutches calibrate lock-up clutch actuation by controlling pump-turbine speed difference and spreading torque to reduce wear.

A double-acting hydraulic cylinder and dual valves keep the parking lock unlockable during power-off or low-charge states for transport and limp-home use.

Variable input-speed thresholds adjust upshift timing by lockup clutch state and engine torque, improving acceleration response without excess engine speed.

A double pressure-threshold sequence resets a hydraulic parking lock after power loss, removing position sensors while keeping a safe base state.

A segmented bushing with spacer, seal, and retaining clip replaces swollen shift shaft bushings without lever removal, reducing leakage risk.

A pull-rod-driven parking cam enables in-cabin mechanical unlocking during power loss while preventing pawl engagement after spring failure.

A pull-cord and translating guide shaft enable in-cabin manual parking unlock during power loss while preventing pawl misalignment.

A dual-switch parking lock holds the parking head against slope-induced retraction, suppressing P-removal without larger packaging or major redesign.

A pressure- and temperature-responsive venting piston removes trapped air while limiting fluid loss and dry running in gear-change selectors.

A unified shift slot and mode-specific indicator improve gear visibility, reduce shifter size, and support automatic and manual operation.

A friction-coupled blocking ring holds off claw engagement until rotational speeds adapt, reducing shift noise, wear, and axial space.

A rotating CAM retracts gate and detent pawls so a gear-seeking shifter can handle variable shift distances without motor overload.

A sliding saddle, radial pin, and oblong slot simplify preloaded spring assembly while preserving angular indexing and preventing gearbox fork jamming.

A capacitor-backed pump controller keeps hydraulic pressure above threshold during TCU resets, preventing unintended park lock engagement.

A spring compliance mechanism lets a compact solenoid complete full stroke while maintaining locking force and avoiding actuator damage.

A bypass priming valve pre-fills transmission clutches in park or neutral to cut fill-time variation and avoid unintended engagement.

Temperature- and pressure-classed reference updates keep transmission shift element state detection accurate despite drift and tolerance changes.

A working-zone control strategy keeps hydraulic motor displacement within torque and kinematic limits to avoid pump saturation and overspeed.

An L-shaped shift lock lever encloses the lock to block contact from nearby vehicle parts and reduce unintended disengagement.

An electric motor, threaded shaft, and push-pull cables coordinate multiple pawls to lock separate gear wheels with precise engagement.

Dynamic locking of a rotary shift control prevents excessive range changes during fast knob rotation while preserving responsive gear selection.

Integrating the power module and multiplexing interface into transmission actuators cuts EMI, power loss, and vibration-driven control costs.

Detecting pedal re-opening during acceleration lets a CVT update shift lines and avoid rubber band feel between engine speed and vehicle speed.

Electronic actuating-pressure control limits hydrostatic pump pressure with simpler hardware, lower losses, and stable transient response.

A magnet-held latching mechanism locks the piston rod during power loss, preventing unintended parking lock movement without hydraulic redundancy.

Motor current and pump speed infer secondary lube flow in automatic transmission hydraulics, avoiding complex sensors and undersupply.

Coordinated control of two clutching devices maintains torque flow during gear shifts, enabling faster shifting with fewer driveline disruptions.

A detent element that also serves as the fluidic piston cuts part count and structural space in motor vehicle parking lock actuation.

Operating an RVT closer to the traction limit raises power density while pressure control, slip protection, and wheel structure cut losses.

A control system adjusts commanded speed ratios to match measured values during drift events in continuously variable transmissions.

A slider mechanism with a guide groove constrains emergency release cable motion to prevent abrasion of the fixing structure.