Speed Controller TRIZ Cases

A dual DC-DC circuit balances the bus neutral point in a three-level EV drive, removing extra balancing hardware to cut volume, cost, and voltage stress.

Route-based disconnector engagement estimation improves AWD eco-vehicle DTE accuracy by reflecting 2WD and 4WD energy use.

Otolith-based acceleration modeling and filtered torque control align pedal input with perceived acceleration while reducing drivetrain shock.

One EV drive motor learns resolver offset at zero torque while the other compensates, preventing backward movement and preserving driver-requested torque.

Planned-route sections are used to cap battery charge and discharge current, limiting heat rise while preserving charge throughput and fuel economy.

Torque limiting on one drive wheel reduces rollback without wheel idling, improving traction and driver comfort on mixed-resistance slopes.

Dynamic torque adjustment uses wheel load and friction estimates to increase regenerative braking energy capture without worsening slip or trailer braking.

Sensor segmentation and door measurement guide a transporter to reach handles, back away during door swing, and pass through safely.

Predictive motion-profile updates keep minimum spacing between linear-motor carriers, avoiding collisions without system-wide stoppages.

Independent motor control sets wheel speeds from steering input to cut slip and maintain traction in 4WD electric tractor turns.

An RL filter between a common DC line and parallel inverters damps resonance, isolates faults, and preserves locomotive traction.

Adjustable contact members and feedback control keep inline inspection gauge speed stable through welds and debris, improving data accuracy.

Adjusting rotor blade pitch from battery charging rate helps consume surplus generator power, limit battery deterioration, and sustain flight.

A shared-wall housing combines the inverter and motor to shorten conductors, cut line losses, and maintain fluid cooling in a compact EV drive unit.

Rotor temperature is estimated from stator, refrigerant, and speed data to avoid low-speed output limits while preventing magnet demagnetization.

A backup control unit monitors drive status and stops high-voltage motor output on faults, improving EV motor control safety.

Two electric machines with different winding turns cover low- and high-torque states, reducing field weakening losses and wasted motor power.

Variable input torque limits help eliminate gear backlash quickly while mitigating rattling shock during the shift from driven to driving travel.

A DC bus, power converter, and electric motor decouple mower blade and wheel speeds, cutting noise and improving traction control.

Measured resistor-leg current reveals abnormal braking choppers, allowing engine speed increase before propel mode to avoid stall.

Braking-generated charging current lets separate drive modules balance battery voltage and transfer energy without inter-module power links.

One watchdog chip monitors two EV control chips through mutual fault checks and reset-shutdown signals, cutting hardware complexity.

A hierarchical controller structure improves redundancy use, fault tolerance, and power distribution in distributed electric propulsion vehicles.

Motor torque is corrected using towing load and disturbance torque estimates to shorten stop distance and avoid deceleration vibration.

Selective acceleration and deceleration pedal maps create customizable resistive torque in EVs to better emulate ICE driving feel.

Vehicle state estimation and TV motor intervention curb longitudinal slip during xEV launch and acceleration on slippery roads.

Staggered motor torque based on wheel-road friction estimates suppresses slip and stabilizes vehicle starts on icy or snowy surfaces.

An alternate control path bypasses faulty drive control signals so the rail drive motor can brake through the inverter without unintended acceleration.

Variable motor braking based on accelerator release rate prevents unintended rapid EV deceleration while preserving one-pedal drivability.

Wheel-specific speed and torque control enables tighter turns than steering geometry alone while limiting slip and preserving traction.

A dual-loop power supply disconnects an overcurrent path and keeps the motor control module powered to prevent sudden motor stoppage.

Filtered creep torque in BEVs smooths negative-to-positive torque reversal, reducing driveline backlash while maintaining low-speed creep control.

Torque is split across multiple vehicle motors by speed-based optimal operating points to improve motor efficiency and vehicle performance.

Route-ahead temperature prediction adjusts torque split and cooling across multiple traction motors to prevent overheating and preserve stability.

A filtered battery current signal lowers vehicle speed limits before EDS saturation, reducing overheating and abrupt power limiting.

Driver-triggered pseudo shifting lets an EV mimic manual-transmission torque changes and shift reaction force for a more natural MT-like feel.

Dynamic control bandwidth adjusts wheel torque to current conditions, improving slip response while reducing truck energy use and comfort loss.

Adaptive start control limits pre-launch drive force only when brake force is active, reducing brake noise without hurting acceleration.

Adaptive brake torque based on slope and vehicle mass holds EVs stationary while reducing motor load, energy waste, and slip during drive-off.

A positive-rail clamping circuit holds a switch gate to its emitter when driver power is lost, preventing inverter phase-leg dual-on shorts.

Navigation and sensor inputs predict downhill, turning, and cruise states to time EV disconnector switching for better control and lower energy loss.