Electric Vehicle Powertrain Layout for Heat Management and Travel Modes
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Solution Overview
Problem
Existing electric vehicle systems using the 'one-motor parallel system' cannot simultaneously achieve high cross-country performance and high cruising performance, as they lack the capability for series travel or series parallel travel, and are affected by engine heat when attempting to enhance cruising performance.
Innovation Solution
An electric vehicle configuration with an engine driving rear wheels and a drive motor for front wheels, along with a power generation motor, utilizing transmission mechanisms to manage power distribution and minimize heat impact, allowing for various travel modes including series and series parallel travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the drive motor is disposed near the engine to reduce space, then vehicle compactness is improved, but heat from the engine adversely affects the motor
Solution Approach 1:
A heat insulating member is introduced as an intermediary substance between the engine and the drive motor. This mediator blocks heat transfer from the engine to the motor, allowing the motors to be positioned close to the engine for compact space utilization while protecting the motor from thermal damage.
2Device complexity
If only one motor is provided in the parallel system, then device complexity is reduced, but the ability to perform series and series parallel travel is lost
Solution Approach 1:
The first motor connected to the crankshaft serves multiple functions: it can operate as a power generation motor during series travel, as a compression starter during engine startup, and work in conjunction with the second motor during parallel travel. This multi-functionality enables series and series parallel travel modes without significantly increasing overall system complexity.
Solution Approach 2:
The control system dynamically switches between different operational modes (series travel, parallel travel, cross-country mode) by adjusting the functions of the two motors. The first motor can dynamically switch between power generation and compression starting functions, while the second motor switches between driving and non-driving states, enabling flexible travel mode transitions.
Data Source
AI summary
An electric vehicle includes: an engine which is disposed on a front side in the vehicle, and which is configured to drive rear wheels of the vehicle, the engine which includes a crank shaft that is extended in a front/back direction of the vehicle; and a drive motor which is arranged in line with the engine in a width direction of the vehicle, and which is disposed on an air intake side of the engine, the drive motor which is configured to drive front wheels of the vehicle.