Vehicle Takeoff Detection Device for Idle Speed Control
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Solution Overview
Problem
Existing strategies for managing engine speed during vehicle takeoff, particularly 'foot-off' scenarios, lead to fuel overconsumption and engine speed oscillations due to non-selective criteria for triggering idle speed regulation setpoints, especially in vehicles without clutch or neutral sensors.
Innovation Solution
A method and device that detect a 'foot-off' type of vehicle takeoff by monitoring clutch pedal pressure, brake pedal absence, zero vehicle speed, and torque on the crankshaft to trigger a take-off aid strategy, increasing the idle speed setpoint only when necessary, with conditions for activation and deactivation to prevent premature or unnecessary increases in engine speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the static idle speed regulation setpoint is increased during takeoff to prevent engine stalling, then engine reliability is improved, but fuel consumption increases and engine speed oscillations occur
Solution Approach 1:
The invention changes the parameter of idle speed setpoint dynamically based on detected takeoff conditions. When a takeoff is detected through specific criteria (clutch engagement, brake release, vehicle motion), the idle speed setpoint is increased to prevent stalling. When takeoff conditions are not met, the setpoint returns to normal levels, avoiding unnecessary fuel consumption during regular idling phases.
2Measurement precision
If takeoff detection criteria are made less selective to cover more scenarios, then detection accuracy is improved, but false triggering occurs leading to fuel overconsumption
Solution Approach 1:
The invention uses multiple parameters simultaneously (clutch engagement, brake release, vehicle speed threshold, gear selection) to define takeoff conditions. This multi-parameter approach increases detection accuracy while preventing false positives, as all conditions must be satisfied concurrently for the idle speed increase to be triggered, thereby avoiding unnecessary fuel consumption.
Data Source
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AI summary
The invention relates to a device (D) which is intended for detecting "short notice" acceleration from rest of a vehicle (V) with a power train including a crankshaft (VL), in order to trigger an acceleration-from-rest-assist strategy intended for increasing the set speed of a speed-limiting governor of said vehicle (V). Said device (D) is arranged such as to detect short notice acceleration from rest in the event of the detection of: the clutch pedal being pressed, the brake pedal not being pressed, a vehicle speed (V) of substantially zero, and the transmission of at least one selected torque to the crankshaft (VL).