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Device for controlling engine rotation stop by estimating kinetic energy and stop position

An engine stop, rotation stop technology, applied in engine control, combustion engine, machine/engine, etc., can solve problems such as loss of fuel consumption

Active Publication Date: 2007-02-14
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there will be a loss of fuel consumption

Method used

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  • Device for controlling engine rotation stop by estimating kinetic energy and stop position
  • Device for controlling engine rotation stop by estimating kinetic energy and stop position
  • Device for controlling engine rotation stop by estimating kinetic energy and stop position

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0050] Referring first to FIG. 1 , a throttle valve 14 is provided in the middle of the intake pipe 13 connected to the intake port 12 of the engine 11 , and the opening degree (throttle opening degree) TA of the throttle valve 14 is detected by a throttle opening degree sensor 15 . A bypass passage 16 is provided in the intake pipe 13 so as to bypass the throttle valve 14 , and an idle speed control valve (ISC valve) 17 is provided in the middle of the bypass passage 16 . An intake pipe pressure sensor 18 is provided on the downstream side of the throttle valve 14 for detecting intake pipe pressure PM, and a fuel injection valve 19 is installed near the intake port 12 of each cylinder.

[0051] A catalyst 22 for exhaust gas purification is installed in the middle of an exhaust pipe 21 connected to an exhaust port 22 of the engine 11 . A cooling water temperature sensor 23 for detecting a cooling water temperature THW is provided on the cylinder block of the engine 11 . The c...

no. 2 example

[0110] As shown in FIG. 11, the second embodiment of the present invention is configured similarly to the first embodiment (FIG. 1).

[0111] According to the second embodiment, as Figure 14 The timing diagram during engine stop is shown to estimate the engine rotation stop position. The instantaneous engine rotational speed Ne at each compression TDC is used as a parameter of engine operation. The ECU 30 measures the length of time required for the crankshaft 24 to rotate, for example, 30° CA from the output interval of the crank pulse signal CRS to calculate the instantaneous rotational speed Ne.

[0112] Here, consider Figure 14 The energy balance of the i-th compressed TDC (TDC(i)) in . Pumping losses in various parts, frictional losses, and driving losses in various auxiliary equipment should all be considered as work hindering the operation of the engine. Assuming that the kinetic energy of the engine at the time point TDC(i-1) is E(i-1), the kinetic energy E(i-1) ...

no. 3 example

[0142] In the second embodiment, whether or not the engine rotation is stopped is judged based on the predicted value of the instantaneous rotational speed at the first TDC thereafter, thereby estimating the engine rotation stop position before the engine rotation stops.

[0143] Here, according to the third embodiment, the process of estimating yet another future instantaneous rotational speed is repeated using the future instantaneous rotational speed and the parameter for impeding motion until it is determined that the engine rotation stops, so that even if not immediately before the engine is about to stop, The engine rotational stop position may also be estimated.

[0144] refer to Figure 17 The time chart is shown to explain the method of estimating the engine rotation stop position according to the third embodiment of the present invention. In a similar manner to that in the second embodiment, the parameter Cstop for impeding engine operation is calculated at TDC(i) d...

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PUM

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Abstract

A control apparatus for an engine increases an intake air quantity just before engine stop to increase a compression pressure in a compression stroke. As the compression pressure is increased, a negative torque in the compression stroke increases and obstructs engine rotation, and brakes the engine rotation. Thus, a range of crank angle, in which torque is below engine friction, that is, in which engine rotation can be stopped, is reduced. As a result, variation in engine rotation stop position is reduced to be within a small range of crank angle. Information of engine rotation stop position is stored, and the stored information of engine rotation stop position is used at the start of an engine to accurately determine an initial injection cylinder and an initial ignition cylinder to start the engine.

Description

[0001] This application is a divisional application. Its original application was a patent application submitted to the China Patent Office on January 30, 2004. The application number is 200410003563.2, and the title of the invention is "A device for controlling engine rotation and stop by estimating kinetic energy and stop position". technical field [0002] The present invention relates to a device for controlling the rotation stop of an engine, estimating the position of the rotation stop and estimating the kinetic energy. Background technique [0003] Generally, ignition control and fuel injection are performed in engine operation by specifying a cylinder based on output signals of a crank angle sensor and a cam angle sensor and detecting a crank angle. But we don't know which cylinder to use for initial ignition / injection until the starter starts the engine and the determination of the specific cylinder is done, ie the predetermined crank angle signal for the specific cy...

Claims

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Application Information

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IPC IPC(8): F02D45/00F02D13/02F02D17/00F02D29/02F02D41/04
CPCY02T10/48
Inventor 西川诚一郎村上佳史
Owner DENSO CORP