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Engine start device

A technology of engine starting and engine, which is applied in the direction of engine starting, engine motor starting, engine components, etc., which can solve the problems of reduced meshing, increased ring gear speed, uncomfortable restarting of the driver, etc., and achieves long life Effect

Active Publication Date: 2013-06-26
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the above-mentioned Patent Document 1, the torque fluctuation caused by the compression and expansion of the piston is not taken into consideration. For example, if there is a cylinder that enters the expansion stroke immediately after the maximum rotational speed is lower than the predetermined range, the rotational speed of the ring gear increases, and the rotational speed of the ring gear increases at a small When the gear and the ring gear contact, the speed range exceeds the specified speed range, and the meshing performance may decrease
[0007] In addition, in the above-mentioned Patent Document 2, when a restart request is received from the driver during the reverse rotation, it is necessary to wait for the reverse ring gear to be in the forward rotation state, and the driver may feel uncomfortable

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0024] figure 1 It is a block diagram showing a schematic configuration of the engine starting device according to Embodiment 1 of the present invention. exist figure 1 Among them, the engine ECU 10 judges whether the idling stop condition (for example, the speed is less than 5 km / h and the driver steps on the brake, etc.) is satisfied, and inputs the judgment result to the controller 13 of the engine starter 19 . The engine starting device 19 includes: a ring gear 11, which is connected with the crankshaft (illustration omitted) of the engine and transmits the rotation of the engine; a crank angle sensor 12, which detects the crank angle of the engine; a starter 18; a controller 13, which controls the Energization of starter motor 17 and solenoid (solenoid) 16 . The starter 18 includes: a pinion 14 that transmits the rotation of the starter motor 17; a plunger 15 that pushes out the pinion 14 and engages the pinion 14 with the ring gear 11; a solenoid 16 that can The plung...

Embodiment approach 2

[0045] Figure 8 It is a block diagram showing a schematic configuration of an engine starting device according to Embodiment 2 of the present invention. exist Figure 8 In the engine starting device of the present invention, a gear level sensor 20 (constituting a gear level detection mechanism) that detects where the gear level of the transmission is set is also included, and each threshold value Tr can also be set for each gear level ( including Tr 1 、Tr 2 , the same below). Thus, the controller becomes the controller 13A.

[0046] Figure 9 Indicates the ring gear speed drop characteristic for each gear level in engine coasting caused by idling stop. Such as Figure 9 As shown, compared to the case of entering the N (neutral) gear, in the case of the gear entering the D (forward) gear, by selecting the D gear, the engine is connected to the drive system. Therefore, from the tires, the transmission Frictional torque, viscous torque, etc. are transmitted, and the drop...

Embodiment approach 3

[0049] In addition, the pulses detected by the crank angle sensor 12 have an angular range in which pulses are not output in order to find the reference positions of the crank angle and the cam angle, a so-called missing tooth angle. Figure 10 (a) shows the temporal change of the crank angle pulse including the tooth-missing angle region, and (b) shows the temporal change of the ring gear rotational speed at this time. Such as Figure 10 As shown, only the usual 2 times or 3 times the angle does not detect the pulse generated by the crank angle, and the ring gear speed Nr changes during this period. Depending on the situation, the pulse may not be input until the engine is completely stopped, and the gear can be generated. A case where the lap speed is not updated.

[0050] Therefore, the threshold value Tr (including Tr) of the angular region immediately before the angular region of missing teeth described above is set to 1 、Tr 2 , the same below) is set higher, and the p...

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Abstract

An engine starting device for an automatic idling stop system includes: a crank angle sensor for detecting a crank angle of an engine; a ring gear connected to a crankshaft of the engine, for transmitting rotation of the engine; ring gear rpm detecting section; a starter motor for starting the engine; a pinion gear for transmitting rotation of the starter motor to the ring gear; pinion-gear push-out section for pushing out the pinion gear into meshing engagement with the ring gear; and pinion gear push-out control section for driving the pinion-gear push-out section to bring the pinion gear and the ring gear into meshing engagement when the ring gear rpm detected by the ring gear rotational speed detection section becomes smaller than a threshold value which is determined by at least one of the crank angle, a gear range, and a restart condition.

Description

technical field [0001] The present invention relates to an engine starting device for an automatic idle stop system that stops an engine from idling when a predetermined idle-stop condition is met and restarts the engine when a restart condition is met. Background technique [0002] Conventionally, for the purpose of improving fuel consumption of automobiles, reducing environmental load, etc., an automatic idling stop system that automatically stops idling when predetermined conditions are satisfied has been developed. For example, in a method for meshing a starter gear with a ring gear and a starter control device described in Patent Document 1 below, when the rotation speed of the ring gear is within a predetermined range and the rotation direction is clockwise At this time, the pinion gear (pinion gear) is meshed with the ring gear, and the initial meshing state of the pinion gear and the ring gear is realized. [0003] In addition, in the following Patent Document 2, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02N11/08F02D29/00F02D29/02F02N15/00F02N15/02
CPCF02N15/067F02N11/0814F02N11/0855Y02T10/48F02N2200/022F02N15/02Y02T10/40
Inventor 北野弘明栗重正彦水野大辅龟井光一郎米泽史郎小田原一浩金田直人
Owner MITSUBISHI ELECTRIC CORP