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Speed ​​display device

A display device and rotational speed technology, applied in the direction of measuring device, transmission control, transportation and packaging, etc., can solve the problem of drivability deterioration and achieve the effect of suppressing fluctuations

Active Publication Date: 2019-06-25
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in a vehicle equipped with an automatic transmission having a torque converter, if the slip amount of the torque converter is to be kept constant, the front-rear acceleration of the vehicle will fluctuate ( So-called shift shock), there is a problem of deteriorating drivability

Method used

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Examples

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Embodiment Construction

[0012] Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

[0013] figure 1 It is an explanatory diagram schematically showing a system configuration of a power system of a vehicle to which the rotational speed display device according to the present invention is applied.

[0014] The internal combustion engine 1 is mounted on a vehicle as a drive source. The internal combustion engine 1 is connected to an automatic transmission 3 via a torque converter 2 including a lock-up mechanism. The automatic transmission 3 transmits the driving force of the internal combustion engine 1 to drive wheels 4 , 4 via a final reduction gear not shown.

[0015] The internal combustion engine 1 is controlled by an ECM (Engine Control Module) 5 . The ECM 5 includes a microcomputer including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (random access memory), and the like.

[0016] Signals from various sensors such as the...

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Abstract

The actual slip amount (S) of the torque converter is calculated by subtracting the actual input shaft rotational speed (Nr) of the automatic transmission from the internal combustion engine rotational speed (Ne) which is the rotational speed of the crankshaft. Then, the engine speed for display (Nd) is calculated by adding the slip amount for display (Sp) obtained by subjecting the actual slip amount (S) to a predetermined correction process. The correction processing described above is, for example, first-order lag filtering processing. Accordingly, even if the actual slip amount (S) temporarily increases or decreases, the temporary increase or decrease of the display engine rotation speed (Nd) can be suppressed. In other words, it is possible to suppress fluctuations in the engine speed for display (Nd), and to provide the driver with a visually favorable engine speed for display (Nd) without impairing drivability.

Description

technical field [0001] The present invention relates to a vehicle-mounted rotational speed display device for displaying the rotational speed of an internal combustion engine. Background technique [0002] Patent Document 1 discloses a rotational speed display device mounted on a vehicle including an internal combustion engine and an automatic transmission including a torque converter. [0003] In a vehicle equipped with an automatic transmission with a torque converter, in order to improve the drivability, it is desirable to set the slip amount of the torque converter to be fixed to obtain the so-called "speed change" in which the vehicle speed change is proportional to the rotation change of the internal combustion engine speed like a manual transmission. Immediate. [0004] However, in a vehicle equipped with an automatic transmission having a torque converter, if the slip amount of the torque converter is to be kept constant, the front-rear acceleration of the vehicle w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60K35/00B60R16/02F02D45/00F16H61/02
CPCB60R16/02F02D45/00F16H2059/467G01P1/07B60K35/81B60K35/28B60K35/214B60K35/00F16H61/02B60R16/0231G01P1/04G01P3/465
Inventor 山本吉纪
Owner NISSAN MOTOR CO LTD
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