Axle-Specific Brake Characterization for Smooth Blended Deceleration
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Solution Overview
Problem
Conventional hydraulic braking systems for vehicles face challenges in providing smooth deceleration transitions between wheel brake cylinder and electric motor usage, leading to comfort issues and inefficiencies in energy-saving and emission-reducing capabilities.
Innovation Solution
A device and method that determine vehicle axle-specific brake characteristic values, considering brake pressure, vehicle state variables, and climatic conditions, to optimize the activation of hydraulic braking system components and electric motors, allowing for seamless deceleration without fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional braking systems selectively decelerate the vehicle using wheel brake cylinders or electric motor, then the vehicle can be decelerated through multiple modes, but the transition between deceleration modes causes deceleration fluctuations that reduce driver comfort
Solution Approach 1:
The patent implements dynamic adaptation of brake characteristic values based on real-time operating conditions. The system continuously adjusts the brake characteristic value function depending on the current braking mode (hydraulic or electric), vehicle state, and environmental conditions to ensure smooth transitions between deceleration modes without perceptible fluctuations to the driver.
Solution Approach 2:
The system changes the brake characteristic value parameter dynamically based on operating conditions. By adjusting this characteristic value according to the current braking mode and environmental factors, the system optimizes the deceleration profile to maintain smooth transitions between hydraulic braking and electric motor deceleration, eliminating jerky sensations.
2Device complexity
If the brake characteristic value is determined without considering vehicle-specific and environment-specific conditions, then the determination process is simple, but the brake characteristic value is not optimally suited for later activation of braking system components
Solution Approach 1:
The system employs feedback mechanisms by continuously monitoring vehicle state variables, environmental conditions, and braking performance. This feedback is used to dynamically adjust the brake characteristic value function, ensuring that the determined values are optimally suited for the current operating conditions and vehicle-specific characteristics.
Solution Approach 2:
The system performs preliminary determination of vehicle-specific and environment-specific brake characteristic values before actual braking operations. By pre-adapting the brake characteristic value function based on anticipated operating conditions, the system ensures optimal braking performance is ready when needed, improving reliability without excessive complexity during actual braking.
3Measurement precision
If additional sensors are added to the hydraulic braking system to determine brake characteristic values, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The system utilizes self-service by leveraging existing sensors and data already present in the vehicle's braking and powertrain systems. Instead of adding dedicated sensors, the system processes available information from wheel speed sensors, brake pressure sensors, and motor control systems to determine brake characteristic values, achieving high measurement precision without increasing hardware complexity.
Solution Approach 2:
The system applies multi-functionality by using existing vehicle sensors for multiple purposes. Sensors originally designed for other functions (wheel speed monitoring, brake pressure control, motor control) are also utilized for determining brake characteristic values, eliminating the need for additional dedicated sensors while maintaining high measurement accuracy.
Data Source
AI summary
A device for a hydraulic braking system of a vehicle. The device includes a processing unit, which is programmed to determine at least one brake characteristic value of the hydraulic braking system, the processing unit being programmed to determine the at least one brake characteristic value as a vehicle axle-specific brake characteristic value, which in each case corresponds to a ratio between a brake pressure in all wheel brake cylinders assigned to a shared vehicle axle of the vehicle and a vehicle axle braking torque exerted on the shared vehicle axle with the aid of the wheel brake cylinders. A method for determining at least one brake characteristic value of a hydraulic braking system of a vehicle, and a method for decelerating a vehicle with a hydraulic braking system and an electric motor usable as a generator, are also described.