Interaxle Electric Power Transfer for Work Vehicle Speed Control
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Solution Overview
Problem
Existing powertrains for work vehicles face inefficiencies in managing electrical energy distribution and speed regulation, particularly in systems with multiple electric machines and batteries, leading to suboptimal performance and control.
Innovation Solution
An electric powertrain system with a controller that manages the operation of dual electric machines and a brake, allowing for modes of energy distribution and speed regulation by directing electrical energy between batteries, electric machines, and actuators based on energy thresholds and vehicle needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical energy is directed to the battery for charging, then battery charge status is improved, but the responsiveness and speed of energy availability for propulsion is reduced
Solution Approach 1:
The second electric machine acts as an intermediary energy transfer device between the first electric machine (generator) and the battery. When the first electric machine generates electrical energy, instead of directing it directly to the battery, it is transmitted through the second electric machine which can rapidly respond and transfer energy to the battery, thus improving both charging reliability and energy availability speed.
2Speed
If the brake is applied to absorb rotational energy for speed reduction, then speed control is improved, but energy loss increases
Solution Approach 1:
The system converts the harmful effect of brake energy absorption into a beneficial resource. When the brake absorbs rotational energy from the second axle, the first electric machine captures this energy and converts it to electrical energy, which is then stored in the battery or used to power the second electric machine. This transforms wasted energy into a useful resource, improving speed control while reducing energy loss.
3Use of energy by moving object
If the first electric machine operates in generator mode to produce electrical energy, then energy self-sufficiency is improved, but the complexity of energy management increases
Solution Approach 1:
The energy management system dynamically adjusts its operation based on real-time conditions. The controller monitors battery charge status, vehicle speed, and energy generation rates, then adaptively determines the optimal energy distribution strategy among the first electric machine, second electric machine, and brake. This dynamic approach manages complexity by responding to actual system needs rather than following fixed rules.
4Speed
If the second electric machine receives electrical energy from the first electric machine, then propulsion responsiveness is improved, but the efficiency of energy conversion is reduced
Solution Approach 1:
The system changes operational parameters dynamically based on system state. When the second electric machine receives electrical energy from the first electric machine, the controller adjusts parameters such as the amount of energy transferred, the operating modes of the electric machines, and the application of the brake to optimize the balance between propulsion responsiveness and energy conversion efficiency. This allows the system to achieve responsive propulsion while minimizing energy losses through intelligent parameter management.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances energy management and speed control by optimizing energy distribution and absorption, improving the efficiency and responsiveness of work vehicles.
Implementation Method 1
the controller is configured to operate the first electric machine in a generator mode which generates electrical energy from the rotational energy of the first axle
Implementation Method 2
the second electric machine in a motor mode which provides rotational energy to the second axle
Implementation Method 3
the actuator to apply the brake which absorbs rotational energy from the second axle
Data Source
AI summary
An electric powertrain for a work vehicle including a first electric machine connected to a first axle, a second electric machine connected to a second axle, a battery connected to the first and second electric machines, a brake connected to the second axle, an actuator connected to the brake, and a controller configured to operate the first electric machine in a generator mode which generates electrical energy from the rotational energy of the first axle, the second electric machine in a motor mode which provides rotational energy to the second axle, and the actuator to apply the brake which absorbs rotational energy from the second axle.