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Vehicle travel controller

A driving control and vehicle technology, which is applied to control devices, vehicle components, engine control, etc., can solve the problems of increasing fuel utilization and reducing braking force amplification, and achieve excellent fuel utilization

Inactive Publication Date: 2015-07-01
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As such, the characteristics of brake performance are different, and if the execution conditions are determined in accordance with any one of the characteristics, although the amplification effect of the braking force can be ensured, the effect of improving the fuel efficiency will be restricted, or the braking force will be reduced even though the fuel efficiency is good. The subject of reduced amplification

Method used

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Examples

Experimental program
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Embodiment

[0044] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0045] figure 1 It is a schematic configuration diagram showing a main part of a control system together with a skeleton diagram of a vehicle drive device 10 to which the present invention is suitably applied. The vehicle driving device 10 includes, as a driving force source, an engine 12 that is an internal combustion engine such as a gasoline engine or a diesel engine that generates power by burning fuel. Between the engine 12 and the automatic transmission 16, a power transmission device such as a vibration damper and a torque converter is provided, but a motor generator functioning as a driving force source may also be provided.

[0046] The engine 12 includes an engine control device 30 including various devices necessary for output control of the engine 12 such as an electronic throttle valve and a fuel injection device, a cylinder deactivation device, ...

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Abstract

The purpose of the present invention is to further improve fuel economy while ensuring amplification of braking force upon brake operation in a vehicle capable of coasting in a state in which there is less engine-braking force than when traveling with engine braking. Free-run coasting, which produces excellent fuel efficiency by traveling with the engine (12) stopped, is maintained until a brake-pedal force (Brk) reaches a first threshold (α), and coasting in neutral, which produces appropriate amplification of the brake-pedal force (Brk) via a brake booster (42) by traveling with the engine (12) still running, is maintained until a second threshold (β) that is higher than the first threshold (α) is reached. This makes it possible, relative to the use of only free-run coasting or only coasting in neutral, to further improve overall fuel economy while ensuring that brake operation produces a sufficient vehicle-braking force.

Description

technical field [0001] The present invention relates to a travel control device for a vehicle, and particularly relates to a technique for ensuring the braking force during a brake operation in a vehicle capable of coasting running with an engine braking force lower than that in engine braking running. Power amplification and further improve fuel utilization. Background technique [0002] As opposed to the engine brake running in which the engine and the wheels are connected and the driven rotation of the engine is used to make the engine brake effective to run, in order to extend the driving distance and improve fuel efficiency, it is considered that the engine braking force is higher than the engine braking force. The engine braking force is low during driving and coasting. The device described in Patent Document 1 is an example, and the following two control modes are proposed: (a) the first coasting running in which the engine is stopped; and (b) the first coasting runn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W10/02B60W10/18B60W10/188F02D29/02F16D48/02F16H61/21
CPCB60W10/02B60W2540/12B60W30/18136B60W10/06B60W10/18B60W10/184F02D29/02B60W2030/1809B60W30/18072B60W10/188F16H61/21F16D2500/50676F16D48/066F16D2500/1085F16D2500/3067F16D2500/3101F16D2500/3127F16D2500/3165F16D2500/5029F16D2500/5085F16D2500/50858B60W2552/15Y02T10/60B60W2510/069B60W2510/18
Inventor 黑木錬太郎平井琢也光安正记金种甲松永昌树铃木健明小暮隆行冈村由香里佐藤彰洋木下裕介木户康成
Owner TOYOTA JIDOSHA KK
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