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Autonomous driving with dynamic skip fire

A technology of autonomous driving and engine, applied in the direction of engine ignition, ignition controller, forward/reverse ignition, etc.

Active Publication Date: 2019-04-02
TULA TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conceptually, almost any effective displacement can be obtained using skip fire control, but in practice most implementations limit operation to the set of available firing fractions, sequences, or modes

Method used

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  • Autonomous driving with dynamic skip fire
  • Autonomous driving with dynamic skip fire
  • Autonomous driving with dynamic skip fire

Examples

Experimental program
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Embodiment Construction

[0027] Most skip ignition engine controllers have a defined set of ignition modes or ignition fractions that can be used during skip ignition operation of the engine. Each ignition mode / score has a corresponding effective engine displacement. Generally, the supported set of ignition modes / fractions is relatively limited, for example, a particular engine may be limited to ignition fractions of 1 / 3, 1 / 2, 2 / 3, and 1. Other skip ignition controllers help to use significantly more unique ignition patterns or scores. By way of example, some skip ignition controllers designed by the applicant help to operate at any ignition fraction between zero (0) and one (1) with an integer denominator of nine (9) or less. This controller has a set of 29 potential ignition fractions, specifically: 0, 1 / 9, 1 / 8, 1 / 7, 1 / 6, 1 / 5, 2 / 9, 1 / 4, 2 / 7, 1 / 3, 3 / 8, 2 / 5, 3 / 7, 4 / 9, 1 / 2, 5 / 9, 4 / 7, 3 / 5, 5 / 8, 2 / 3, 5 / 7, 3 / 4, 7 / 9, 4 / 5, 5 / 6, 6 / 7, 7 / 8, 8 / 9 and 1. Although 29 potential ignition fractions may be possibl...

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Abstract

The present invention relates generally to techniques for improving fuel efficiency of a vehicle powered by an internal combustion engine capable of operating at various displacement levels. An autonomous driving unit or cruise controller selects when possible an engine torque output that corresponds to a fuel efficient displacement level. The resultant vehicle speed profile and NVH level is acceptable to vehicle occupants.

Description

[0001] Cross references to related applications [0002] This application claims priority for US Provisional Patent Application No. 62 / 373,449 filed on August 11, 2016, which is incorporated herein by reference. Background technique [0003] The present invention generally relates to techniques for improving the fuel efficiency of engines. In one example, the environment is identified during driving, where a slight reduction in engine torque output can result in disproportionately greater fuel savings by enabling use of lower effective displacement. The described technology is particularly well suited for implementation in autonomous vehicles. [0004] Recently, passenger vehicles with autonomous or semi-autonomous driving capabilities have been vigorously developed. Although fully autonomous vehicles have not yet been commercialized, great progress has been made in their development, and it is expected that autonomous vehicles will become a commercial reality in the relatively nea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D28/00F02D11/10F02D17/02F02D41/00F02D41/02F02D41/24
CPCF02P9/00F02D11/105F02D17/02F02D29/02F02D41/02F02D41/26F02D2250/18F02D2200/501F02D41/0087G08G1/22B60W10/06B60W10/08B60W10/30B60W30/1882B60W30/1886B60W2720/103B60W2710/0666B60W20/10B60W2556/50B60W2556/65Y02T10/62G05D1/0061G05D1/0005F02D41/1402F02P5/1512
Inventor 拉姆·苏布拉马尼安路易斯·J·塞拉诺马修·A·杨金斯
Owner TULA TECH INC