Vehicle Shift Torque Reserve for Direct Drive-Reverse Switching

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Solution Overview

Problem

The shift from out-gear to in-gear states in modern vehicle gear shift systems, particularly those operated by button rather than lever, poses a challenge in maintaining engine output torque, as traditional torque reserve control methods are not executable in these systems.

Innovation Solution

A vehicle control device with a shift-position detecting section and a torque reserve control section that increases engine output torque during switching operations between in-gear states, utilizing a combination of throttle and ignition control to manage torque reserve and prevent engine stall.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a button-type gear shift system allows direct switching between drive and reverse ranges without neutral intervention, then the ease of operation is improved, but the engine output torque becomes unstable and engine stall may occur

Engineering Contradiction:

Improveease of operationVSAvoidreliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The control device increases engine output torque in advance before the shift from drive range to reverse range occurs. By detecting the shift operation and preemptively increasing torque output, the system ensures sufficient torque is available when the transmission engages reverse gear, preventing engine stall while enabling direct range switching.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control device applies preliminary anti-action by increasing engine output torque before the torque demand increases during reverse gear engagement. This counteracts the potential torque deficiency that would otherwise cause engine stall, allowing direct range switching without neutral intervention.

Inventive Principle:

Principle #9Preliminary anti-action

2Reliability

If torque reserve control is executed during switching between in-gear states, then the engine output torque stability is improved, but the device complexity increases

Engineering Contradiction:

Improveengine output torque stabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The control device integrates multiple functions into a single control unit that detects shift operations, determines gear range transitions, and executes torque reserve control. This multi-functional approach maintains engine torque stability during in-gear state switching without requiring separate dedicated components for each function, thereby limiting the increase in device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11022056B2Vehicle control device

Publication Date: 2021.06.01 BOSCH CORP

AI summary

A vehicle control device is capable of securing engine output torque even in a 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 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.