Load-Adaptive Pseudo Engine Sound for Battery Electric Vehicles

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Solution Overview

Problem

Existing battery electric vehicles lack a realistic pseudo engine sound that adapts to changes in the overall weight of the vehicle, which affects the torque required for driving.

Innovation Solution

A battery electric vehicle equipped with one or more processors that acquire the load weight of the vehicle and adjust the pseudo engine sound output accordingly, using a sound management system to simulate engine sounds based on driving state and load weight.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a fixed pseudo engine sound is generated in a battery electric vehicle, then the driver can experience a realistic engine sound, but the sound does not reflect changes in vehicle weight and thus lacks realism under varying load conditions

Engineering Contradiction:

Improvesimplicity of sound generation systemVSAvoidadaptability of pseudo engine sound to varying vehicle weight

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The pseudo engine sound is made dynamic by adjusting its characteristics based on the detected vehicle weight. The system transitions from a fixed sound output to a variable sound output that adapts to different driving conditions, making the sound more realistic while maintaining system simplicity.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes parameters of the pseudo engine sound (such as frequency, amplitude, or timbre) according to the detected vehicle weight. By modifying sound parameters based on load conditions, the system achieves adaptability without complex mechanical changes.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the pseudo engine sound is adjusted according to vehicle load weight, then the realism of the sound is improved, but the system complexity increases due to additional sensors and control logic

Engineering Contradiction:

Improveadaptability of pseudo engine sound to varying vehicle weightVSAvoidcomplexity of sound management system

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The system replaces complex mechanical weight adjustment mechanisms with electronic sensing and digital signal processing. A weight detection device (such as a sensor) and processor substitute for mechanical systems, reducing physical complexity while achieving the desired adaptability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The weight detection device acts as an intermediary between the vehicle's actual weight and the pseudo engine sound generation. This intermediary component translates physical weight into control signals that adjust the sound characteristics, simplifying the overall system architecture.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250178527A1Vehicle management system and battery electric vehicle

Publication Date: 2025.06.05 TOYOTA JIDOSHA KK

AI summary

A battery electric vehicle includes one or more processors configured to generate a pseudo engine sound and to output the pseudo engine sound from a speaker mounted on battery electric vehicle. The one or more processors obtain a load weight of battery electric vehicle. The one or more processors then change the pseudo engine sound in response to the load weight.