Driving Motor Torque Compensation for Vehicle Pitch Control

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Solution Overview

Problem

Existing vehicle motion control technologies face limitations in effectively reducing pitch motion degradation during rapid braking, particularly in motor-driven vehicles, due to constraints in suspension design changes that affect other performance aspects.

Innovation Solution

An apparatus and method that utilize a controller to continuously calculate and update the torque applied to the driving motor based on the pitch rate and suspension longitudinal deformation degree, allowing for real-time compensation to alleviate pitch motion discomfort during braking.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If suspension design is changed to reduce pitch motion, then pitch motion is reduced, but other vehicle performances are affected and design flexibility is limited

Engineering Contradiction:

Improvepitch motion reductionVSAvoidsuspension design flexibility

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The patent replaces mechanical suspension design modifications with an electrical control system. The controller calculates pitch rate based on suspension longitudinal deformation degree and uses this information to control the driving motor torque, thereby reducing pitch motion without changing the physical suspension structure. This substitution maintains suspension design flexibility while achieving pitch reduction.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the control parameter of the driving motor from basic speed control to torque control with pitch compensation. By continuously calculating the pitch rate and compensating the basic torque with a control level based on pitch rate, the system dynamically adjusts motor parameters to reduce pitch motion while maintaining other performance characteristics.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If conventional pitch control based on suspension design is used, then pitch motion is reduced, but design changes are limited due to interdependence with other configurations

Engineering Contradiction:

Improvepitch motion controlVSAvoiddesign interdependence

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical design modifications with a relatively simple electronic control system. The controller uses sensors to detect suspension longitudinal deformation degree, calculates pitch rate, and adjusts driving motor torque accordingly. This approach avoids the complex interdependencies of mechanical suspension redesign while achieving effective pitch control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an intermediary computational layer (the controller) that processes suspension deformation data and translates it into motor torque adjustments. This intermediary system decouples the pitch control function from the suspension mechanical design, allowing independent optimization of both systems without mutual constraints.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Speed

If basic torque control is used for speed regulation, then vehicle speed is controlled, but pitch motion during braking is not adequately addressed

Engineering Contradiction:

Improvevehicle speed controlVSAvoidpitch motion during braking

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The patent merges the speed control function with pitch motion control by integrating pitch rate calculation and compensation into the existing torque control system. The controller calculates both the basic torque for speed regulation and the compensation torque for pitch reduction, then combines them to generate the final motor torque command, achieving dual functionality without separate systems.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements feedback control by continuously monitoring suspension longitudinal deformation degree, calculating pitch rate in real-time, and using this feedback to dynamically adjust the driving motor torque. This closed-loop control system automatically compensates for pitch motion during braking while maintaining speed control, addressing both objectives simultaneously.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20230331096A1Apparatus and method for controlling of motion of vehicle

Publication Date: 2023.10.19 HYUNDAI MOTOR CO LTD

AI summary

Disclosed are an apparatus and a method for controlling a motion of a vehicle. An apparatus for controlling a motion of a vehicle includes a driving motor operated based on a basic torque calculated to control a speed of the vehicle according to a target speed. The apparatus may further include a controller that is configured to control a torque of the driving motor by determining a stop state of the vehicle calculating a pitch rate of the vehicle from a driving state to the stop state calculating a control level based on the pitch rate, and compensating the basic torque with the control level.