Shift Position Torque Reserve Control for Direct Drive-Reverse Switching
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Solution Overview
Problem
The gear shift system of a button type, which allows free selection of shift positions without interposing the neutral range, poses a challenge for engine control units to execute torque reserve control, thereby securing engine output torque during shift position switching operations.
Innovation Solution
A vehicle control device that implements torque reserve control by increasing engine output torque through adjustments in intake throttle valve opening and ignition timing, ensuring appropriate engine output torque during switching operations between in-gear states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a button-type gear shift system is used to allow free selection of shift positions without interposing the neutral range, then the ease of operation is improved, but the ability to execute torque reserve control is lost, causing engine output torque to be insufficient during shift position switching
Solution Approach 1:
The system performs preliminary detection of shift position switching operations and pre-prepares torque reserve control actions. When a direct switching operation between drive and reverse ranges is detected, the control device activates torque reserve control in advance to ensure sufficient engine output torque is available during the clutch engagement process, preventing engine stall.
Solution Approach 2:
The control device continuously monitors shift position signals and detects switching operations in real-time. Based on this feedback, the system dynamically adjusts engine torque output by controlling the intake throttle valve and ignition timing, ensuring appropriate torque is maintained during direct shift position changes without passing through neutral range.
2Productivity
If shift position is switched directly between drive and reverse ranges without interposing neutral range, then the productivity is improved, but the reliability of preventing engine stall deteriorates
Solution Approach 1:
The system detects shift position switching operations and activates torque reserve control in advance before the actual clutch engagement occurs. This preliminary action ensures that sufficient engine torque is prepared and available when the forward clutch engages during direct switching between drive and reverse ranges, preventing engine stall while maintaining fast switching capability.
Solution Approach 2:
The control device changes engine operating parameters including intake throttle valve opening and ignition timing to adjust torque output. During direct shift position switching, these parameters are modified to maintain appropriate engine torque levels, ensuring reliable prevention of engine stall while enabling rapid shift position changes.
3Reliability
If torque reserve control is executed during direct switching between drive and reverse ranges, then the reliability of engine output torque is improved, but the device complexity increases
Solution Approach 1:
The control device integrates multiple functions including shift position detection, torque reserve control activation, and engine torque management into a single unified system. By making the control device universal and multi-functional, the patent avoids adding separate dedicated components for torque reserve control, thereby maintaining reliability while minimizing increases in overall system complexity.
Solution Approach 2:
The control device automatically detects shift position switching operations and autonomously activates torque reserve control without requiring additional external control systems or complex coordination. The system serves itself by integrating the detection and control functions within the existing control device, ensuring reliable engine torque management while avoiding unnecessary complexity.
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 vehicle control device effectively secures engine output torque during switching operations between in-gear states, preventing engine stall and reducing torque shock, even when shift positions are switched directly between drive and reverse ranges.
Implementation Method 1
The transmission is continuously provided from an output shaft of the engine via a torque converter as a fluid coupling
Implementation Method 2
the forward clutch is engaged. Consequently, the driveshaft rotates in a normal rotation direction
Data Source
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AI summary
The present invention provides a vehicle control device capable of securing engine output torque even in the case where a switching operation is performed between a first shift position and a second shift position, both of which are in an in-gear state. The vehicle control device is a vehicle control device capable of performing a mutual switching operation between the first shift position and the second shift position, at both of which a power transmission system is in the in-gear state, and includes: a shift-position detecting section that detects a selected shift position; and a torque reserve control section that executes torque reserve control to increase output torque of an engine when a shift switching operation is performed between the first shift position and the second shift position.