Variable Motor Power Driving System for Vehicle Energy Management
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Solution Overview
Problem
Conventional vehicle driving systems limit the range of motor usage due to fixed maximum generation power based on motor size, leading to increased energy consumption and potential brake device deterioration, especially when operating at varying vehicle speeds.
Innovation Solution
A driving system with a motor connected to a wheel via a power transmission device, such as a clutch or hydraulic brakes, that adjusts power transmission capacity by controlling application force, using sensors to monitor current application force and adjust motor power generation or increase accordingly to match the vehicle's speed and state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor is used with a fixed maximum generation power based on motor size irrespective of vehicle speed, then the brake device can be protected from slippage, but the motor usage range is limited and energy consumption increases
Solution Approach 1:
The patent applies dynamics by making the maximum generation power of the motor variable according to vehicle speed. The control device dynamically adjusts the maximum generation power based on the detected vehicle speed, allowing the motor to operate efficiently across different speed ranges rather than being constrained by a fixed power limit based solely on motor size.
Solution Approach 2:
The patent changes the parameter of maximum generation power from a fixed value to a variable value that depends on vehicle speed. The control device modifies the maximum generation power parameter based on detected vehicle speed, enabling the motor to adapt its power output characteristics to match operating conditions and expand its usable range.
2Reliability
If the necessary brake application force is determined based on fixed maximum generation power, then brake slippage is prevented, but the motor cannot be used in wider ranges and brake device energy consumption increases
Solution Approach 1:
The patent makes the necessary brake application force dynamic by linking it to vehicle speed through the motor's maximum generation power adjustment. The control device calculates the necessary brake application force based on the dynamically adjusted maximum generation power, which itself is determined by vehicle speed, creating a adaptive system that maintains reliability while expanding motor usage range.
Solution Approach 2:
The patent changes the parameter of necessary brake application force from a fixed value to a variable value that adapts to vehicle speed conditions. By modifying the maximum generation power parameter based on vehicle speed, the system automatically adjusts the corresponding necessary brake application force, enabling broader motor operation ranges without compromising brake slippage prevention.
3Adaptability or versatility
If the power transmission device application force is increased to exceed necessary application force for wider motor usage, then motor range expands, but brake device energy consumption increases significantly
Solution Approach 1:
The patent optimizes the application force parameter of the power transmission device by linking it to vehicle speed through the dynamically adjusted maximum generation power. The control device sets the application force based on the current vehicle speed and corresponding maximum generation power, ensuring the motor operates within its optimal range without unnecessarily increasing brake device energy consumption.
Solution Approach 2:
The patent implements feedback by having the control device continuously detect vehicle speed and adjust the maximum generation power and corresponding application force accordingly. This closed-loop control ensures that the motor operates efficiently within its optimal range while preventing excessive energy consumption by the brake device, as the application force is dynamically matched to actual operating conditions.
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
This system expands the motor's usable range while reducing energy consumption and preventing brake device deterioration by dynamically controlling power transmission based on real-time conditions, improving control simplicity and response.
Implementation Method 1
a power transmission device (e.g., a clutch CL/hydraulic brakes 60A, 60B in embodiment) that is provided on a power transmission path between the motor and the wheel and that can change a power transmission capacity of the power transmission path by controlling an application force
Data Source
AI summary
A driving system includes: a motor; a power transmission device; a motor controller; an application force controller; and an application force acquiring device. When the motor controller receives a request for generation of power in such a state that the motor generates no power, the motor controller controls to permit and/or prohibit the generation of power of the motor based on the current application force and a necessary application force which is an application force of the power transmission device that is needed to transmit a maximum generation power of the motor in a current rotating state quantity which is a rotating state quantity that the motor is currently having.