Vehicle Launch Control Friction Adaptation
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Solution Overview
Problem
Existing processes for preparing a defined starting operation in motor vehicles, such as launch control, do not always achieve optimal acceleration due to unpredictable variations in friction parameters, leading to suboptimal drive torque predictions.
Innovation Solution
A process where the friction parameter is determined as a function of state variables from preceding defined starting operations, allowing for continuous correction and optimization of engine rotational speed or torque settings via an electronic control unit to maximize drive torque during acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotational engine speed is set to a fixed value for launch control preparation, then the starting operation can be initiated, but optimal acceleration is not achieved due to unpredictable friction variations
Solution Approach 1:
The system determines a friction parameter based on state variables from preceding starting operations and uses this feedback to automatically adjust the specified rotational engine speed or torque. This closed-loop approach allows the system to adapt to actual friction conditions rather than relying on fixed predetermined values, thereby resolving the contradiction between maintaining a set starting procedure and achieving optimal acceleration under varying friction conditions.
Solution Approach 2:
The system dynamically changes the engine control parameters (rotational speed or torque) based on the determined friction parameter. Instead of using a fixed predetermined value, the specified value is automatically adjusted as a function of the friction parameter derived from actual vehicle behavior in previous starts, enabling optimal acceleration performance across different friction conditions.
2Productivity
If the friction parameter is determined from state variables of preceding starting operations, then optimal acceleration is achieved, but the system requires continuous adaptation and control
Solution Approach 1:
The system determines the friction parameter autonomously based on state variables from preceding starting operations without requiring external intervention or complex external sensing systems. The electronic control unit automatically processes the data from the vehicle's own operational history to derive the friction parameter and adjust control settings, enabling the system to self-optimize while maintaining relatively simple architecture.
3Ease of operation
If a predetermined rotational engine speed is used, then the starting operation is simple to execute, but suboptimal drive torque is achieved due to friction variations
Solution Approach 1:
The system performs preliminary determination of the friction parameter based on state variables from preceding starting operations before executing the current starting operation. This advance preparation allows the electronic control unit to set the optimal specified rotational engine speed or torque in advance, maintaining simple driver operation while ensuring optimal acceleration performance through pre-computed control parameters.
Data Source
AI summary
A process is provided for preparing a defined starting operation of a motor vehicle selectable by the driver, having a starting element arranged between an engine and a transmission. In the event of a maximal power demand by the driver and in the event of the selection of the defined starting operation by an electronic control unit, the rotational speed or the torque of the engine is set to a specified value, wherein the specified value is automatically determined by the electronic control unit as function of a determined friction parameter, by which at least one relative prediction concerning the transmissible drive torque to be expected for the acceleration operation can be made, such that, by use of the specified during the starting and acceleration operation following the preparation, the maximally possible drive torque is achieved for the best possible acceleration. The friction parameter is determined as a function of a state variable determined during a preceding defined starting operation, which state variable influences the occurring drive torque.