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Controlling device and method for hybrid vehicle

A technology of hybrid vehicle and control device, which is applied in the direction of hybrid vehicle, power device, control device, etc., to achieve the effect of avoiding the impact of engine stop

Active Publication Date: 2007-09-26
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, at present, including Patent Document 1, there is no proposed technique for performing the above-mentioned first clutch disengagement, engine stop, and driving force sharing switching in such a manner that the mode switching is performed smoothly without shock when the mode is switched.

Method used

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  • Controlling device and method for hybrid vehicle
  • Controlling device and method for hybrid vehicle
  • Controlling device and method for hybrid vehicle

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Embodiment Construction

[0032] Hereinafter, embodiments of the present invention will be described in detail based on the embodiments shown in the drawings.

[0033] 1 shows a power transmission system of a front-engine-rear-wheel-drive hybrid vehicle, which has a hybrid drive device that can use the mode switching control device of the present invention, 1 is an engine, and 2 is driving wheels (rear wheels).

[0034] In the power transmission system of the hybrid vehicle shown in FIG. 1, like a normal rear-wheel drive vehicle, the automatic transmission 3 is arranged in series behind the engine 1 in the vehicle front-rear direction, and the engine 1 (crankshaft 1a) and the automatic transmission 3 is provided with a motor / generator 5.

[0035] The motor / generator 5 functions as a motor or as a generator.

[0036] Between the motor / generator 5 and the engine 1, more specifically, between the shaft 4 and the engine crankshaft 1a, a first clutch 6 is inserted, and the engine 1 and the motor / generator ...

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Abstract

A mode switching controlling device and method switches a hybrid drive (HEV) mode to an electric drive (EV) mode without engine stoppage shock. A fourth-to-fifth speed upshifting command is generated due to reduction in an accelerator opening. Then, an HEV-to-EV-mode switching command is generated. A command pressure of a direct clutch is set to 0, and an actual-pressure reduction disengages the direct clutch, causing an automatic transmission to be in a neutral state. When a first time elapses from generation of the switching command, a first clutch command pressure is set to its maximum value, and the first clutch disengages by an actual pressure increase. When a second time elapses, the engine is stopped by reducing engine torque to perform mode switching. A front brake command pressure is set to a precharge pressure when the second time elapses and to its maximum value at a later time when a gear-switching rotation matching controlling operation of a motor-generator is ended, so that the front brake is engaged due to an actual pressure increase for upshifting from the fourth to fifth speed.

Description

technical field [0001] The present invention relates to a hybrid vehicle capable of running using power from an electric motor / generator in addition to an engine, having two modes: electric driving (EV) mode, which runs using only power from the electric motor / generator; and hybrid A power drive (HEV) mode, which enables driving using power from both the engine and the electric motor / generator. [0002] In particular, it relates to a mode switching control device for performing a required engine stop without shock and smoothly when switching to the former EV mode without engine output during running in the latter HEV mode. Background technique [0003] As a hybrid drive device used in the above-mentioned hybrid vehicle, various forms have been proposed at present, and as one of them, the technology described in Patent Document 1 is known. [0004] The structure of this hybrid driving device is that the output shaft of the engine and the input shaft of the transmission are c...

Claims

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Application Information

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IPC IPC(8): B60W10/06B60W10/08B60W10/02B60W20/00B60K6/48B60K6/547B60L50/16B60W10/04B60W10/10B60W30/19B60W30/20F16D48/02F16H61/02F16H61/68F16H61/684F16H61/686F16H63/50
CPCB60L2240/423Y02T10/6286B60W10/115B60W10/06B60W2510/104B60K6/387B60W2510/1015B60W2710/025Y02T10/48B60K6/48B60W10/02B60K6/547B60L2240/486B60W2710/083B60K6/365B60L2240/421B60W20/00B60W2710/0666Y02T10/642B60W2510/081B60W2510/0638B60W10/08Y02T10/6221B60L2240/441Y02T10/40Y02T10/62Y02T10/64B60W2710/02B60W20/15B60K6/46B60W30/20
Inventor 谷岛香织
Owner NISSAN MOTOR CO LTD
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