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Automatic stop/restart control system for internal combustion engine and variable valve actuating apparatus

An automatic stop and control system technology, applied in engine control, engine start, internal combustion piston engine, etc., can solve the problems of high peak combustion pressure, increased internal combustion engine rotation change, passenger discomfort, etc., to increase the ratio, reduce The effect of lower limit rotation speed and improved combustion torque

Inactive Publication Date: 2016-02-10
HITACHI AUTOMOTIVE SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the method described in Patent Document 1, starting without a starter can only be performed when the rotational speed reaches a relatively high lower limit, and there is a problem that the proportion of starting without a starter cannot be sufficiently increased.
[0013] Here, in order to ensure the combustion torque at the time of starting without a starter, it is considered to increase the charging efficiency excessively or increase the air-fuel ratio, but in this case, the peak combustion pressure is too high, and the rotation change of the internal combustion engine at the time of starting without a starter increases. passenger discomfort

Method used

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  • Automatic stop/restart control system for internal combustion engine and variable valve actuating apparatus
  • Automatic stop/restart control system for internal combustion engine and variable valve actuating apparatus
  • Automatic stop/restart control system for internal combustion engine and variable valve actuating apparatus

Examples

Experimental program
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Effect test

Embodiment 1

[0109] In the internal combustion engine having the above-mentioned variable valve device, then using Fig. 8 to Figure 11 The first embodiment of the present invention will be described in detail. Here, in the embodiment described below, both the valve opening timing ( EVO1 ) of the exhaust valve 5 and the valve closing timing ( IVC1 ) of the intake valve 4 at the time of restart are default positions, which are mechanically stable positions.

[0110] Figure 8A , Figure 8B The operation of the exhaust valve 5 and the intake valve 4 during transition from the automatic stop state (when fuel injection is stopped) to the restart state in this embodiment is shown. Here, the exhaust valve 5 is controlled by the exhaust VEL1, and the intake valve 4 is controlled by the intake VTC3.

[0111] Figure 8A The figure on the left shows the exhaust valve 5 and the intake valve 4 in the low-rotation running state before transitioning to the automatic stop state, or in the automatic s...

Embodiment 2

[0177] Next, use Figure 12A , Figure 12B The second embodiment of the present invention will be described, but in Example 1, when a restart request is generated at a speed equal to or less than the first predetermined speed Nk1, the valve opening timing of the exhaust valve 5 and the closing time of the intake valve 4 are changed. However, in Embodiment 2, when the number of revolutions N falls below the fourth predetermined number of revolutions Nk4 at time Ta, the output changes the valve opening timing of the exhaust valve 5 and the closing valve of the intake valve 4 without waiting for a restart request. Period control signal, which is the difference between embodiment 2 and embodiment 1. In addition, in Figure 12B in the flow chart, because with Figure 11 The same symbols in the control steps of the shown flowcharts denote the same processing, so the description will be simplified.

[0178] Such as Figure 12A As shown, the motor vehicle is in a running (cruisin...

Embodiment 3

[0189] Next, use Figure 13A , Figure 13B The third embodiment of the present invention will be described, but in Example 1, the exhaust VEL1 is used to control the opening timing of the exhaust valve 5, but in Example 3, the difference is that the exhaust VTC2 is used instead of the exhaust VEL1. Therefore, the exhaust valve 5 does not control the valve lift, but controls the valve timing (phase) similarly to the intake VTC3.

[0190] The exhaust VTC2 and the intake VTC3 in this embodiment have actually the same structure, and the two VTC2, 3 are different from the intake VTCs of Embodiment 1 and Embodiment 2, and the most retarded angle position is the default position. That is, the coil springs 55 and 56 biasing the vane 32b of the vane member 32 bias the vane 32b to the retarded side, and are set to the most retarded angle phase when the hydraulic pressure is not supplied. The status at this time is Figure 13A Phase shown on the right. In the present embodiment, as de...

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PUM

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Abstract

The invention provides an automatic stop / restart control system for an internal combustion engine and a variable valve actuating apparatus. After fuel injection stops and a restart request is generated to allow fuel to be supplied again, combustion torque of combustion gas obtained by combustion of fuel is effectively utilized, and therefore the proportion of starting without a starter is increased. After fuel injection stops, the valve opening time of an exhaust valve is made to be delayed in a vicinity of a bottom dead center on an expansion stroke during a decrease in the rotating speed of the internal combustion engine, and combustion torque of the combustion gas from fuel generated by fuel injection during restart is effectively utilized. Therefore, after fuel injection stops and a restart request is generated for restart, the combustion torque obtained by combustion of fuel is effectively utilized. In this way, the lower-limit rotating speed of starting without a starter can be reduced and the proportion of starting without a starter is increased.

Description

technical field [0001] The present invention relates to an automatic stop / restart control system of an internal combustion engine, and a variable valve device used in the system, which has a function of restarting the internal combustion engine during the process of reducing the speed of the internal combustion engine by automatic stop control. Background technique [0002] In recent years, vehicles equipped with automatic stop / restart control systems (so-called idling stop control systems) of internal combustion engines have been increasing for the purpose of reducing fuel consumption and exhaust emissions. At present, a general idle stop control system stops fuel injection when the driver stops the vehicle, automatically stops the internal combustion engine, and then performs an operation (brake release operation, accelerator pedal operation, etc.) When the engine is activated, it automatically energizes the starter or the motor that is also used as a starter to make the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D13/08F01L1/34F01L13/00F02D29/02
CPCF01L1/3442F01L13/0026F01L2001/0537F01L2001/3443F01L2001/34469F01L2001/34483F01L2013/0073F01L2250/02F01L2820/032F02B2075/125F02D13/0211F02D13/0219F02D13/08F02D41/0002F02D41/042F02D41/065F02D2013/0292F02D2041/001F02D2200/101F02N11/0844F02N19/004F02N2200/022Y02T10/12Y02T10/40
Inventor 中村信
Owner HITACHI AUTOMOTIVE SYST LTD
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