JP2015055155A - Power generation control device during deceleration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To configure a power generation control device during deceleration so as to obtain deceleration feeling when a vehicle is decelerated using a generator during deceleration of the vehicle.SOLUTION: Control means (11) includes: a power generation quantity suppressing part (22) that is coupled to output addition inhibiting means (12) for inhibiting addition of output of an internal combustion engine (1) to driving wheels, and suppresses a power generation quantity of a generator (8); and a power generation quantity suppression inhibiting part (23) to inhibit operation of the power generation quantity suppressing part (22). When the output addition inhibiting means (12) is executed and a fuel injection is carried out, the control means (11) inhibits the suppression of a power generation quantity in the generator (8) by the power generation quantity suppression inhibiting part (23).

Description

  The present invention relates to a power generation control device for deceleration, and more particularly to a power generation control device for deceleration of a vehicle including a generator that generates electric power using the driving force of an internal combustion engine.

In general, as a generator mounted on a vehicle, one that generates electric power by using rotation of a crankshaft of an internal combustion engine is known.
Examples of such a generator control device include the following prior art documents.

Japanese Patent No. 3797242

  The power generation control device for a vehicle according to Patent Document 1 forcibly charges the battery by increasing the power generation voltage of the generator at the time of deceleration fuel cut (fuel cut) of the internal combustion engine. The power generation voltage of the generator is lowered for a predetermined time according to the amount of charge to make no power generation.

  However, fuel cut (fuel cut) may be prohibited during vehicle deceleration. Specifically, when the temperature of the catalyst that purifies the exhaust gas of the internal combustion engine becomes high, in order to cool the catalyst, fuel cut may be prohibited during deceleration of the vehicle and fuel injection may be continued. is there. In this case, the output of the internal combustion engine tends not to decrease with respect to the fuel cut. On the other hand, the generated voltage of the generator may be increased or decreased depending on the SOC (charged state) or voltage of the battery, the state of charge / discharge of the battery, or the like. When the generated voltage is suppressed, the load applied to the internal combustion engine of the generator is reduced, and the speed at which the internal combustion engine speed decreases is reduced. For this reason, there has been a problem that the vehicle cannot feel the deceleration or the fuel consumption deteriorates.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a deceleration power generation control device that provides a feeling of deceleration when a vehicle is decelerated using a generator during deceleration of the vehicle.

  The present invention relates to a vehicle power generation control apparatus for deceleration of a vehicle, comprising: a generator that generates electric power using a driving force of an internal combustion engine; and a control unit that includes a power generation amount suppression unit that suppresses the power generation amount of the generator. Output addition prohibiting means for prohibiting the addition of the output to the drive wheel, the control means includes a power generation amount suppression prohibiting section for prohibiting the operation of the power generation amount suppression section, and the output addition prohibiting means is implemented. And when fuel injection is performed, suppression of the electric power generation amount of the said generator by the said electric power generation amount suppression prohibition part is prohibited, It is characterized by the above-mentioned.

  According to the present invention, when the vehicle is decelerated using the generator during deceleration of the vehicle, a feeling of deceleration can be obtained.

FIG. 1 is a system configuration diagram of the deceleration power generation control device. (Example) FIG. 2 is a time chart of power generation control during deceleration. (Example) FIG. 3 is a flowchart of deceleration power generation control. (Example)

  The present invention aims at obtaining a sense of deceleration when the vehicle is decelerated using the generator when the vehicle is decelerating, in the case where the output addition prohibiting means and the fuel injection are implemented. This is achieved by prohibiting the suppression of noise.

1 to 3 show an embodiment of the present invention.
As shown in FIG. 1, an internal combustion engine 1 that generates a driving force for driving wheels is mounted on a vehicle. The internal combustion engine 1 includes a crankshaft 2, and a transmission 4 is connected to the crankshaft 2 via a clutch 3 serving as a transmission clutch. Further, an exhaust pipe 6 having a catalyst 5 is connected to the internal combustion engine 1. A fuel injection valve 7 is attached to the internal combustion engine 1.
Further, the vehicle is equipped with a generator 8 that generates electric power by the driving force of the internal combustion engine 1 and a battery 9 that stores electric power. The battery 9 can be charged using the electric power generated by the generator 8.

The internal combustion engine 1 and the generator 8 are connected to a deceleration power generation control device 10.
The deceleration power generation control device 10 includes control means (ECM) 11 that controls the internal combustion engine 1 and the generator 8.
The control means 11 is connected to the fuel injection valve 7 of the internal combustion engine 1, the generator 8, and the output addition prohibiting means 12. This output addition prohibiting means 12 prohibits adding the output of the internal combustion engine 1 to the drive wheels.
This output addition prohibiting means 12 is for transmitting the condition that the amount of depression of the accelerator pedal is less than a predetermined amount, the condition that the shift position is in the neutral position, or the output of the internal combustion engine 1 to the transmission 4 or the drive wheels. This is performed when any one of the conditions in which the clutch 3 serving as the transmission clutch is in the released state is satisfied. Here, the depression amount of the accelerator pedal is detected by using an accelerator sensor 13 that detects the depression amount of the accelerator pedal. The shift position is detected using the position sensor 14. The disengagement state of the transmission clutch is detected using, for example, a clutch sensor 15 that can detect the connection state of the clutch 3 between the internal combustion engine 1 and the transmission 4.

The control means 11 is connected to an internal combustion engine oil temperature detection means 16, a catalyst temperature detection means 17, an internal combustion engine speed detection means 18, and a battery voltage detection means 19.
The internal combustion engine oil temperature detection means 16 detects the internal combustion engine oil temperature. The oil temperature of the internal combustion engine is estimated from a method of directly detecting the oil temperature using an oil temperature sensor, a cooling water temperature of the internal combustion engine 1 or an operating state of the internal combustion engine 1 (driving time of the internal combustion engine 1). Also good.
The catalyst temperature detecting means 17 detects the catalyst temperature. The catalyst temperature may be a method in which the temperature of the catalyst 5 is directly detected by a sensor or the like, or a method in which the catalyst temperature is estimated based on the exhaust gas temperature, the fuel cut state, the air-fuel ratio, or the like of the internal combustion engine 1. good.
The internal combustion engine rotational speed detection means 18 detects the rotational speed of the internal combustion engine and uses a crank angle sensor that detects the rotational angle of the crankshaft 2.
The battery voltage detection means 19 detects the battery voltage of the battery 9.

Further, the control means 11 includes a fuel injection amount control unit 20 and a fuel cut (fuel cut) control unit 21.
The fuel injection amount control unit 20 operates the fuel injection valve 7 to control the fuel injection amount to the internal combustion engine 1.
The fuel cut control unit 21 stops fuel injection from the fuel injection valve 7 when a predetermined fuel cut condition is satisfied during vehicle deceleration.

The control unit 11 includes a power generation amount suppression unit 22, a power generation amount suppression prohibition unit 23, a power generation amount increase unit 24, and a power generation prohibition unit 25.
The power generation amount suppression unit 22 suppresses the power generation amount of the generator 8. The power generation amount suppression prohibition unit 23 prohibits the operation of the power generation amount suppression unit 22. The power generation amount increasing unit 24 further increases the power generation amount of the power generator 8 and causes the power generator 8 to perform regenerative power generation. The power generation prohibition unit 25 prohibits power generation by the generator 8.

And the control means 11 prohibits suppression of the electric power generation amount of the generator 8 by the electric power generation amount suppression prohibition part 23, when the output addition prohibition means 12 is implemented and fuel injection is performed.
Further, the control unit 11 implements the power generation amount increasing unit 24 together with the power generation amount suppression prohibiting unit 23.

Next, the power generation control during deceleration according to this embodiment will be described along the flowchart of FIG.
As shown in FIG. 3, when the program of the control means 11 starts (step A01), first, each signal is input (step A02). Specifically, in this step A02, the internal combustion engine oil temperature, the catalyst temperature, the depression amount of the accelerator pedal as the presence / absence of the execution of the output addition prohibiting means 12, the internal combustion engine speed, and the like are input. The implementation of the output addition prohibiting means 12 is determined from the depression amount of the accelerator pedal, the shift position, or the connection state of the clutch 3 for transmitting the output of the internal combustion engine 1 to the transmission.
Then, it is determined whether or not the power generation suppression prohibiting condition is satisfied (step A03). Specifically, in step A03, whether or not the power generation suppression prohibiting condition is satisfied is determined based on whether or not the following conditions (1) to (4) are all satisfied.
(1), internal combustion engine oil temperature ≧ predetermined internal combustion engine oil temperature
Here, the predetermined internal combustion engine oil temperature is, for example, an oil temperature when the internal combustion engine 1 is in a warm-up state.
(2), catalyst temperature ≧ predetermined catalyst temperature
Here, the predetermined catalyst temperature is a temperature at which the catalyst 5 is determined to undergo thermal degradation.
(3), accelerator pedal depression amount <predetermined depression amount
Here, the predetermined depression amount is the depression amount of the accelerator pedal that does not increase the output of the internal combustion engine 1.
The contents of (3) are provided in the output addition prohibiting means 12.
When any of the above (1) to (3) is established, it is determined that the internal combustion engine 1 shifts to the idle operation state, and the fuel injection amount is reduced to shift to the idle operation state. It should be noted that instead of the accelerator pedal depression amount, it may be determined that a transition to the idle operation state occurs even if either of the following two conditions is satisfied.
Condition 1 ... Whether the shift position is in the neutral range
Condition 2 Whether or not the internal combustion engine 1 and the transmission 4 are connected by the clutch 3 (4), the internal combustion engine speed> the target speed
Here, the target rotational speed is, for example, the internal combustion engine speed when the internal combustion engine 1 is in an idle operation state.

If step A03 is YES, the power generation suppression control is prohibited (step A04). It should be noted that a power generation amount increasing means for increasing the power generation amount may be provided, and the power generation by the generator 8 may be performed so as to generate a larger voltage together with the prohibition of the power generation suppression control in step A04. As a result, the necessary feeling of deceleration can be obtained when the degree of deceleration of the vehicle is small only by prohibiting power generation suppression control.
Subsequently, it is determined whether or not a predetermined time has elapsed since the prohibition of power generation suppression control started in step A04 has been performed (step A05). In step A05, the reason why the prohibition of power generation suppression control is continued for a predetermined time is that frequent switching between prohibition of power generation suppression control and cancellation of prohibition (that is, implementation of power generation suppression control) may occur. Control means such as ticking, which suppresses the driver from feeling uncomfortable due to this frequent switching, and causes the driver to feel uncomfortable, and further causes chattering of the control due to frequent switching between prohibition and cancellation of power generation suppression control It is possible to prevent the switch switching sound from 11 and to protect the control means 11 itself.
If this step A05 is NO and the predetermined time has not elapsed, it is determined whether or not the battery voltage is equal to or higher than a preset predetermined voltage (step A06). Here, the above-mentioned predetermined voltage is a guard value for preventing the battery 9 from being overcharged.
If step A06 is NO, the process returns to step A04.
If this step A06 is YES, the power generation by the generator 8 is stopped (step A07). Thereby, overcharge of the battery 9 can be prevented. At the same time, the prohibition of power generation suppression control is canceled.
On the other hand, when step A03 is NO, the power generation suppression control is performed because the conditions for prohibiting the power generation suppression control are not satisfied (step A08).
When step A05 is YES, after the process of step A07 or after the process of step A08, the program is returned (step A09).

FIG. 2 shows a time chart of power generation control during deceleration.
As shown in FIG. 2, in the acceleration state of the vehicle, when the accelerator sensor 13 is turned off and the power generation amount suppression is executed and the output addition prohibiting means 12 is executed (time t1), the vehicle is coasted. In the example, the internal combustion engine rotational speed is reduced to a target rotational speed at a predetermined speed (time t3) (indicated by a one-dot chain line in the present proposal). In this case, in the “power generation amount suppression (conventional)” shown in FIG. 2, the power generation amount suppression may be executed when the accelerator sensor 13 is turned off. This improves the rotational convergence.
However, in “Prior Art 1” shown in FIG. 2, the rotation behavior when the fuel cut control is prohibited to protect the catalyst 5 is slower than the time when the fuel cut control is executed, so that the rotation convergence is slower. The target rotational speed is not reached even after the time t3 has passed since the decrease in the number has slowed (indicated by the solid line of the conventional 1).
Further, in “Conventional 2” shown in FIG. 2, due to the rotational behavior when the fuel cut control is executed, the internal combustion engine rotational speed rapidly decreases and reaches the target rotational speed at time t2 before the above-described time t3. (Indicated by the broken line in the prior art 2).

Although the embodiments of the present invention have been described above, the above-described embodiments will be described for each claim.
First, in the invention according to claim 1, the control means 11 is connected to the output addition prohibiting means 12 that prohibits the addition of the output of the internal combustion engine 1 to the drive wheel, and the power generation of the generator 8 is suppressed. A power generation amount suppression prohibiting unit including a power amount suppression unit and a power generation amount suppression prohibiting unit for prohibiting the operation of the power generation amount suppression unit, and when the output addition prohibiting unit is implemented and fuel injection is performed. 23 is prohibited from suppressing the amount of power generated by the generator 8.
Thereby, when the output addition prohibiting means 12 and the fuel injection are performed, the suppression of the power generation amount of the generator 8 is prohibited, so that the internal combustion engine speed can be quickly converged to the target speed. . As a result, the output of the internal combustion engine 1 can be lowered early, so that a vehicle with a feeling of deceleration can be provided and fuel consumption can be improved.
In the invention according to claim 2, the control unit 11 includes the power generation amount increasing unit 24 that increases the power generation amount of the power generator 8, and implements the power generation amount increasing unit 24 together with the power generation amount suppression prohibiting unit 23.
Thereby, since the electric power generation amount by the generator 8 is increased, the output of the internal combustion engine 1 can be lowered earlier and the fuel consumption can be improved.
In the invention according to claim 3, the output addition prohibiting means 12 outputs the condition that the amount of depression of the accelerator pedal is less than a predetermined amount, the condition that the shift position is in the neutral position, or the output of the internal combustion engine 1 to the transmission 4. Or it implements when either conditions of the conditions in which the clutch 3 as a transmission clutch for transmitting to a driving wheel is an open state are satisfied.
Thereby, the state in which the output from the internal combustion engine 1 decreases to shift to the idle operation state can be determined by a plurality of means of the vehicle.

  The deceleration power generation control device according to the present invention can be applied to various vehicles.

1 Internal combustion engine 2 Crankshaft 3 Clutch (transmission clutch)
DESCRIPTION OF SYMBOLS 4 Transmission 5 Catalyst 6 Exhaust pipe 7 Fuel injection valve 8 Generator 9 Battery 10 Deceleration power generation control device 11 Control means 12 Output addition prohibition means 13 Accelerator sensor 14 Position sensor 15 Clutch sensor 16 Internal combustion engine oil temperature detection means 17 Catalyst temperature Detection means 18 Internal combustion engine speed detection means 19 Battery voltage detection means 20 Fuel injection amount control unit 21 Fuel cut (fuel cut) control unit 22 Power generation amount suppression unit 23 Power generation amount suppression prohibition unit 24 Power generation amount increase unit 25 Power generation prohibition unit

Claims (3)

  In a vehicle deceleration power generation control device including a generator that generates electric power using a driving force of an internal combustion engine and a control unit that includes a power generation amount suppression unit that suppresses the power generation amount of the generator, the output of the internal combustion engine is driven Output addition prohibiting means for prohibiting addition to the wheel, and the control means includes a power generation amount suppression prohibiting section for prohibiting the operation of the power generation amount suppressing section, wherein the output addition prohibiting means is implemented and fuel injection is performed. A power generation control device at the time of deceleration of a vehicle, wherein the power generation amount suppression prohibiting unit prohibits the power generation amount of the generator from being suppressed when it is performed.   2. The deceleration according to claim 1, wherein the control unit includes a power generation amount increasing unit that increases a power generation amount of the generator, and implements the power generation amount increasing unit together with the power generation amount suppression prohibiting unit. Power generation control device.   The output addition prohibiting means is a condition for transmitting the output of the internal combustion engine to a transmission or a drive wheel, when the accelerator pedal is depressed less than a predetermined amount, or when the shift position is in a neutral position. The deceleration power generation control device according to claim 1, wherein the control is performed when any one of the conditions in which the clutch is in an open state is satisfied.

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