Adaptive Cruise Control Override Mode During Manual Gear Shifts
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Solution Overview
Problem
Conventional adaptive cruise control systems for vehicles with manual gearboxes experience discontinuities and jerks during gear changes, as the system is partially or completely deactivated when the driver changes gears, conflicting with the 'override' mode that allows temporary speed overshoot, leading to an undesirable return to the programmed speed.
Innovation Solution
A method and device that manage the adaptive speed and/or distance regulator by detecting the start of a gear change and temporarily neutralizing the comparison between the driver's and regulator's setpoints to maintain the 'override' mode, ensuring the system remains in this mode until the gear change is complete, with optional additional maintenance based on the driver's input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the adaptive cruise control is deactivated during gear change, then the gear change can be executed, but the override mode is lost and the vehicle speed returns to the programmed speed
Solution Approach 1:
The system detects the start of a gear change before it completes and proactively stores the current override mode state. This preliminary action ensures that when the gear change is executed, the override mode can be restored immediately afterward, preventing the unwanted return to programmed speed.
Solution Approach 2:
A state storage mechanism acts as an intermediary between the gear change operation and the cruise control mode management. The stored state serves as a buffer that preserves the override mode information during the gear change transient, allowing seamless restoration without loss of control mode.
2Ease of operation
If the accelerator pedal is released to press the clutch pedal for gear change, then the gear change can be initiated, but the comparison between driver input and control system input switches from override mode back to cruise control mode
Solution Approach 1:
The system detects clutch pedal activation in advance and stores the override mode state before the comparison logic can switch modes. This preliminary detection and storage action prevents the automatic mode transition that would otherwise occur when the accelerator pedal is released.
Solution Approach 2:
By storing and restoring the override mode state, the system maintains continuous override mode control throughout the gear change sequence. The useful action of override mode (driver-controlled speed exceeding) continues uninterrupted despite the intermediate clutch operation.
3Adaptability or versatility
If the cruise control regulation is overridden to allow temporary speed exceeding, then the driver can accelerate above set speed, but the system cannot maintain this mode during gear changes
Solution Approach 1:
The system proactively stores the override mode state upon detecting gear change initiation, before the instability can occur. This preliminary preservation action ensures that the adaptable speed control flexibility is maintained stable throughout the gear change event.
Solution Approach 2:
The state storage mechanism mediates between the flexible override mode and the stable system operation during gear changes. It preserves the adaptable characteristics while ensuring stable composition by preventing unwanted mode transitions.
Data Source
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AI summary
The invention relates to a device for managing an adaptive cruise control system for speed and/or distance of a motor vehicle with a manual gearbox, comprising a supervisory module (10) capable of managing the switching between a first operating mode imposing a predetermined set speed and a second operating mode allowing a temporary overshoot of the set speed, based on a comparison made between a driver setpoint representing an engine torque requested by a driver according to the degree of depressment of an accelerator pedal and a cruise control setpoint representing an engine torque corresponding to said set speed, the supervisory module being capable of commanding, when the cruise control is in the second operating mode and in response to the detection of a gear change, a temporary neutralization of the comparison made on the driver setpoint,to force the system to remain in the second operating mode.