Sprocket Service Braking for Snow Groomer Downhill Speed Control
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Solution Overview
Problem
Existing snow groomers with electric drive motors struggle to provide sufficient resistance during downhill travel, leading to unintentional acceleration, necessitating additional devices that increase complexity and cost.
Innovation Solution
Implementing a continuously controllable service brake for each sprocket wheel, coupled with a sensor to monitor speed and an electronic control unit to manage braking based on target speed, allowing mechanical energy dissipation and independent control of the brakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electric drive motors are used to drive sprocket wheels, then the snow groomer can operate with modern propulsion systems, but the motors cannot provide sufficient resistance during downhill travel, causing unintentional acceleration
Solution Approach 1:
The braking function is separated from the drive function. Each sprocket wheel has its own independent service brake that can be controlled separately, allowing the braking system to operate independently of the electric drive motors during downhill travel
Solution Approach 2:
A service brake is introduced as an intermediary mechanical device between the sprocket wheel and the environment. The brake provides the necessary resistance moment mechanically, without requiring the electric motors to be oversized for downhill conditions
2Power
If additional functional devices are added to provide resistance during downhill travel, then sufficient braking force is achieved, but the device complexity and cost increase
Solution Approach 1:
The service brake serves multiple functions: it provides resistance during downhill travel, enables controlled downhill driving, and works in conjunction with the electronic control unit to maintain speed. This single device handles multiple braking scenarios without requiring separate systems for each condition
Solution Approach 2:
The braking system is automatically controlled by the electronic control unit based on speed sensor feedback. The system self-regulates the brake application to maintain target speed without requiring manual intervention or complex mechanical linkages, reducing overall system complexity
3Reliability
If electric drive motors are oversized to handle downhill conditions, then sufficient resistance is available, but the installation space, cost, and weight increase
Solution Approach 1:
The functions of propulsion and braking are segmented into separate systems. The electric motors are sized only for propulsion needs, while the service brake handles the resistance requirement during downhill travel, allowing each component to be optimally sized for its specific function
Solution Approach 2:
The service brake acts as a mediator that provides the additional resistance moment needed for downhill control without requiring the electric motors to be oversized. This separates the peak power requirements from the continuous propulsion needs
4Loss of energy
If a brake chopper is used to dissipate braking energy, then energy management is improved, but installation space, costs, and heat input into the cooling system increase
Solution Approach 1:
Instead of using a brake chopper to convert kinetic energy into electrical energy for recovery, the system directly dissipates the braking energy as heat through the service brake into the surrounding environment. This simpler approach avoids the complexity of energy recovery systems while effectively managing the braking energy
Solution Approach 2:
The braking energy is extracted from the system and dissipated directly into the environment through the service brake. This eliminates the need for complex energy management systems like brake choppers and their associated cooling requirements
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
Ensures reliable and safe downhill travel without overdimensioning electric drive systems, reducing installation space, cost, and heat generation, while maintaining speed control independently of battery condition.
Implementation Method 1
the service brake brakes the sprocket wheel to the respective target speed... directly dissipates corresponding mechanical energy
Implementation Method 2
The heat energy generated by the active braking intervention in the invention is preferably dissipated into the vehicle's surroundings via a planetary gear housing located in the area of each sprocket
Data Source
Figure 1
Figure 2
AI summary
2.1 A snow groomer with a tracked undercarriage having a track and a sprocket wheel on opposite sides of the undercarriage, each sprocket wheel being driven by an electric drive motor mechanically coupled to the sprocket wheel, and with a drive control that controls the two electric drive motors, is known. 2.2 According to the invention, each sprocket wheel is assigned a service brake that is continuously adjustable by means of an electronic control unit. Each sprocket wheel is assigned a sensor that detects an actual speed and is connected to the control unit for comparison with a stored target speed. The service brake is controlled by the control unit depending on whether the actual speed exceeds the target speed, such that the service brake decelerates the sprocket wheel to the respective target speed. 2.3 Use for the maintenance and design of snow slopes.