Generator Braking Control via Accelerator Pedal Position
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Solution Overview
Problem
Existing systems lack a simple and comfortable method for selecting generator-based braking power in vehicles, as it is difficult to integrate with driver inputs from control elements like the accelerator and brake pedals, leading to inconsistent feedback and sensitivity.
Innovation Solution
A method that predefines generator-based braking power as a function of the accelerator pedal position, allowing it to be adjusted independently of the brake pedal, with generator-based braking power assuming values based on the state of the accelerator pedal, even when it's actuated, and proportional to friction braking power when the brake pedal is engaged, ensuring a consistent braking sensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If generator-based braking power is adjusted as a function of accelerator pedal position, then integration with driver input is improved, but feedback consistency deteriorates due to varying maximum braking power depending on battery state of charge and temperature
Solution Approach 1:
The patent applies parameter changes by adjusting the generator-based braking power as a function of accelerator pedal position rather than using a fixed braking curve. The maximum generator-based braking power is dynamically adapted based on battery state of charge and temperature, allowing the system to maintain reliable feedback consistency while integrating with driver input through variable parameter adjustment.
2Power
If generator-based braking power is set to maximum values, then braking capability is improved, but driver comfort deteriorates due to excessive deceleration feedback
Solution Approach 1:
The patent applies partial action by using only the portion of maximum generator-based braking power that is necessary to achieve the desired braking effect. Instead of always applying maximum braking power, the system adjusts the generator-based braking power to be proportional to the friction braking power, ensuring adequate braking capability while maintaining driver comfort through moderate deceleration.
3Device complexity
If generator-based braking power is adjusted independently of brake pedal, then control simplicity is improved, but braking precision deteriorates
Solution Approach 1:
The patent uses the accelerator pedal position as an intermediary parameter to coordinate both motor-based propulsion power and generator-based braking power. This intermediary approach maintains control simplicity by using a single control element while achieving braking precision through the proportional relationship between generator-based braking power and friction braking power, both controlled via accelerator pedal position.
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 approach allows for seamless integration of generator-based braking with driver inputs, reducing feedback inconsistencies and maintaining similar braking sensation to friction braking, while allowing for precise control of motor-based propulsion and generator-based braking power.
Implementation Method 1
a generator having adequate power is installed in the drive train
Implementation Method 2
a motor-based propulsion power is predefinable as a function of the position of a first final control element
Data Source
AI summary
In a method for predefining a generator-based braking power of an electric machine in a vehicle, a motor-based propulsion power is predefined as a function of the position of a first final control element, e.g., an accelerator pedal, and the generator-based braking power is predefined as a function of the position of the first final control element, the generator-based braking power assuming values which are unequal to zero, already at an actuated position of the first final control element.