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Control system for hybrid vehicle

A control system and vehicle technology, applied in hybrid vehicles, vehicle energy storage, vehicle components, etc., can solve problems such as incoordination, and achieve the effect of preventing fluctuations and smooth shifting

Inactive Publication Date: 2010-05-12
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It also creates a sense of incongruity

Method used

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  • Control system for hybrid vehicle
  • Control system for hybrid vehicle
  • Control system for hybrid vehicle

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0079] In the first example shown in FIG. 5, when it is judged that the accelerator is off at time t1, the shifting operation is not performed, and the forced release of the lockup clutch has not been performed recently. In this case, figure 2 The control flow shown goes from step S1 to step S2, and from step S3 to step S4. In this case, as shown in (B), the engine rotational speed Ne (=torque converter input rotational speed Nti) is greater than transmission input shaft rotational speed Nm (=torque converter output rotational speed Nto). Therefore, as shown in (C), the slip ratio TSR of the torque converter 6 is less than 100%, and TSR<SH2 (SH2=120%). As a result, the control flow goes to step S5.

[0080] Also, no co-ops have been executed recently, nor have co-ops been forcibly terminated. As a result, the flow of control proceeds from step S5 to step S6 at which the termination timer is set, and then the flow of control passes through step S7 to step S8. As described ...

example 2

[0085] Fig. 6 shows a second example. In this example, the state at time t1 is the same as in the first example, so the control flow goes to step S14 and step S15 where deceleration lock control is started without performing cooperative operation of the motor generator 4 . As a result, the lockup clutch control pressure PLC supplied to the lockup clutch 5 increases at time t1, and thereafter, as shown in (D), the control to engage the lockup clutch 5 is started. Since the accelerator is turned off, at time t2 as shown in (C), the engine speed Ne is greatly reduced beyond the transmission input shaft speed Nm, and the slip ratio TSR is increased to be greater than the first threshold SH1.

[0086] Therefore, the control flow proceeds from step S8 to step S16 and further to step S17, at which the cooperative lock control is executed, and the cooperative operation of the motor generator 4 is performed. In this case, the lockup clutch control pressure PLC is lowered and adjusted ...

example 3

[0090] Fig. 7 shows a third example. Also in this example, the state at time t1 is the same as the first example, so the control flow goes to step S14 and then to step S15 where deceleration lock control is started without performing cooperative operation of the motor generator 4 . As a result, the lockup clutch control pressure PLC supplied to the lockup clutch 5 increases at time t1, and thereafter, as shown in (D), the control to engage the lockup clutch 5 is started. Since the accelerator is closed, the rotation speed of the engine greatly drops beyond the transmission input shaft rotation speed Nm, and the slip ratio TSR increases above the first threshold SH1 at time t2 as shown in (C).

[0091] Therefore, the control flow proceeds from step S8 to step S16 and further to step S17, at which the cooperative lock control is executed, and the cooperative operation of the motor generator 4 is performed. In this case, the lockup clutch control pressure PLC is lowered and adju...

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Abstract

A hybrid vehicle comprises an engine 2 , a motor generator 4 , a torque converter 6 with a lock-up clutch 5 , and a ratio-change mechanism 7 . A control system for the hybrid vehicle comprises a rotational sensor 22 , which detects the slip ratio of the torque converter, and a hydraulic control valve 12 , which controls the engagement of the lock-up clutch. While the vehicle is moving along with the accelerator pedal being released from its stepped down condition, a driving force from the wheels is transmitted to the motor generator 4 for energy regeneration. If the slip ratio of the torque converter is equal to or smaller than a first threshold value, then only the lock-up clutch is controlled into engagement. However, if the slip ratio is between the first threshold value and a second threshold value, then additionally the motor generator is controlled in cooperative operation.

Description

technical field [0001] The present invention relates to a hybrid vehicle comprising an engine, a motor-generator, a torque converter with a lock-up clutch, and a ratio-changing mechanism, the hybrid vehicle is driven by the driving force of at least one of the engine and the motor-generator, and the driving force is transmitted Force to drive the wheels through a torque converter and ratio change mechanism. Background technique [0002] Such hybrid vehicles are disclosed, for example, in Japanese Laid-Open Patent Applications H6(1994)-319210, H9(1997)-322307, H10(1998)-73161, 2003-205767, 2004-84679, and 2004-210123. As disclosed in these documents, various types of hybrid vehicles have been proposed. For example, the following ideas are combined in a system in which a vehicle is driven by driving force from an engine and a motor-generator, or selectively from either of them, which is transmitted to drive the wheels, that is, is combined In systems where the engine and mot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W20/00B60W40/12B60K6/485B60K6/547B60L50/16B60W10/02B60W10/06B60W10/08B60W10/10B60W10/18F16H61/14
CPCY02T10/6286Y02T10/6226Y02T10/7077Y02T10/6221Y02T10/62Y02T10/7072
Inventor 喜多野和彦木村雅哉伊地知康弘石川丰堀口尚志
Owner HONDA MOTOR CO LTD
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