Integrated EV Brake Module for Secure Parking on Inclines
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Solution Overview
Problem
Wet multidisk brakes in electric vehicles experience microslip, preventing secure parking on inclines for extended periods.
Innovation Solution
A compact brake system with a frictionally engaging wet service brake and a positively engaging parking brake, actuated by an adjustable mechanism that allows for neutral, service, and securing regions, enabling secure parking on inclines by using sensors to detect unintended rolling and generate counteracting torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a wet multidisk brake is used as service brake, then cooling is improved and maintenance is reduced, but the brake cannot securely hold the vehicle on inclines due to microslip
Solution Approach 1:
The brake system is segmented into two independent braking circuits: a wet multidisk service brake for dynamic braking and a separate dry parking brake for static holding. This segmentation allows each brake type to perform its optimal function without compromise - the wet brake provides cooling and maintenance-free operation during driving, while the dry parking brake provides secure holding on inclines during parking.
Solution Approach 2:
The actuator is designed with multi-functionality to control both the service brake and parking brake through a single component. The actuator can operate in different modes (service brake region, neutral region, parking brake region) to provide both dynamic braking and static parking functions, eliminating the need for separate actuators while maintaining the benefits of both brake types.
2Reliability
If a separate parking brake with separate hydraulic circuit is added, then parking security is improved, but device complexity increases
Solution Approach 1:
The service brake and parking brake are merged into a single integrated brake module with a common actuator. The actuator serves dual purposes by controlling both the wet multidisk service brake and the dry parking brake through different operational regions, thereby reducing the number of hydraulic circuits and actuators while maintaining independent parking security.
Solution Approach 2:
The single actuator is designed with universal functionality to perform both service braking and parking brake operations. By implementing neutral, service brake, and parking brake regions within the actuator's travel range, the system achieves complex dual-function control without requiring separate hydraulic circuits for each brake type.
3Weight of stationary object
If brake systems are arranged diagonally or dual configuration, then weight and cost are reduced, but braking coverage may be compromised
Solution Approach 1:
The diagonally arranged brake systems are equipped with multi-functional actuators that can control both service and parking brakes on each axle. This universal actuator design ensures that even with reduced brake system coverage, the vehicle maintains reliable braking and parking capabilities through the neutral region functionality that prevents unintended rolling.
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
The system ensures reliable vehicle security on inclines by maintaining continuous braking engagement, preventing unwanted rolling through coordinated actuation of service and parking brakes, and reducing costs and weight with diagonal or dual brake system configurations.
Implementation Method 1
the friction between the brake disks, intermediate disks and pressure plates produces a braking torque
Implementation Method 2
heat is conducted away
Implementation Method 3
an electric machine having a sensor and communicating with the axle. The sensor makes it possible to detect an unintended rolling of the electric vehicle so that, in response to the rolling, a countertorque which opposes the rolling can be generated by the electric machine
Data Source
AI summary
An electric vehicle with at least one brake system and an axle and a method to operate the electric vehicle. The at least one brake system is arranged at the axle and includes a wet service brake, a parking brake, and an actuator. The actuator is adjustable and can communicate with a service brake in a service brake region or with the parking brake in a securing region to generate a braking action at the axle in each instance. A neutral region in which the actuator communicates neither with the service brake nor with the parking brake is located between the service brake region and the securing region. A plurality of brake systems are advantageously used jointly in the various configurations.