Friction Clutch Control for Driveline Shock Load Mitigation
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Solution Overview
Problem
Heavy-duty vehicles experience mechanical failure due to high shock loads during sudden stops or transitions from slipping to non-slipping events, which existing clutch control strategies fail to effectively mitigate.
Innovation Solution
A clutch control system with a friction clutch capable of transitioning between fully open, partially open, and fully closed positions, controlled by a control unit that defines operational modes including a driveline protection mode to absorb shock loads, preventing clutch slip and protecting fragile driveline components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clutch is kept fully closed to prevent slip during normal operation, then driveline protection is maintained, but wear on the friction clutch increases and lifespan decreases
Solution Approach 1:
The clutch control system dynamically adjusts the clutch state between fully closed and partially open positions based on real-time driving conditions. During normal operation, the clutch remains fully closed for optimal power transmission. When wheel slip or sudden stop conditions are detected, the system transitions to partially open position to allow controlled slip and protect the driveline from shock loads, thereby extending clutch lifespan while maintaining protection capability.
Solution Approach 2:
The system changes the clutch engagement parameter from a binary state (fully closed/open) to a continuous range of positions. By controlling the clutch actuator to position the clutch at specific engagement levels (partially open), the system optimizes the balance between protection and wear reduction, allowing the clutch to absorb shock loads without constant engagement.
2Duration of action of stationary object
If the clutch is kept fully open to reduce wear, then clutch lifespan increases, but driveline protection capability is lost
Solution Approach 1:
The control system proactively transitions the clutch to a partially open position before significant shock loads occur. By detecting early signs of wheel slip or sudden stop conditions, the system prepares the clutch in advance to absorb upcoming shock loads, ensuring protection is already in place when the event occurs, rather than reacting after damage has begun.
Solution Approach 2:
The clutch acts as an intermediary element between the engine and driveline, mediating the transmission of torque. By positioning the clutch in a partially open state, it serves as a buffer that can selectively transmit or block shock loads, protecting the driveline while minimizing wear through controlled engagement rather than constant contact.
3Reliability
If traditional control strategies limit engine torque to prevent shock loads, then driveline stress is reduced, but effectiveness in mitigating shock loads from suddenly stationary wheels is limited
Solution Approach 1:
The system extracts the shock load mitigation function from the engine torque control and relocates it to the clutch mechanism. Instead of limiting engine torque system-wide, the clutch is specifically positioned to absorb shock loads locally at the driveline interface, allowing full engine power to be maintained while providing targeted protection where needed.
Solution Approach 2:
The clutch control system dynamically responds to wheel slip and sudden stop conditions by adjusting clutch engagement in real-time. This dynamic adjustment allows the system to maintain high effectiveness during critical events while avoiding unnecessary torque limitation during normal operation, thereby resolving the contradiction between reliability and productivity.
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 effectively prevents mechanical failure by allowing the clutch to slip when significant shock loads occur, thereby avoiding damage to more delicate driveline parts.
Implementation Method 1
a friction clutch capable of transitioning between a fully open, a partially open, and a fully closed position
Data Source
AI summary
A clutch control system mitigates driveline shock loads in a vehicle. The clutch control system has 1) A friction clutch capable of transitioning between a fully open, a partially open, and a fully closed position; 2) A control unit configured to receive vehicle data, wherein the vehicle data comprises current engine torque, and define one or more operational modes of the friction clutch, wherein the one or more operational modes comprise a driveline protection mode defined by having an operating range between the fully open position and an effectively closed position of the clutch, wherein the effectively closed position is a partially open position having a torque capacity that exceeds the current engine torque, thereby preventing clutch slip at the effectively closed position; and 3) A clutch actuator configured to operate the clutch in accordance with the one or more operational modes, including the driveline protection mode.