JP2006112322A - Idling stop control device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an idling stop vehicle reducing frequent occurrence of start and stop of an engine even during long time stop. <P>SOLUTION: An idling stop control device 200 for the vehicle automatically stopping and starting an engine 100 during stop of the vehicle includes a battery monitor 231 and an alternator 102. Automatic stop of the engine 100 is permitted if battery charge quantity is a predetermined value or more, and the predetermined value is set higher at a time of long time stop than that at a time of short time stop. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an idle stop control for a vehicle that stops an engine when a predetermined condition is satisfied while the vehicle is stopped, and restarts the engine when another predetermined condition is satisfied.

As this type of technology, in a battery mounted on a hybrid vehicle, in order to effectively charge and discharge between the battery and the electric load, the battery charge capacity is monitored and the battery charge capacity is lower than the target capacity. And a battery that automatically starts the engine and charges the battery is disclosed (for example, see Patent Document 1).
JP 2002-325373 A

  However, when the prior art described in Patent Document 1 is applied to an idle stop vehicle that automatically stops the engine when the vehicle is stopped, only the battery charge capacity is monitored and the engine is automatically started when the vehicle stops for a long time. There is a possibility that the driver feels uncomfortable due to frequent start and stop of the engine.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide an idle stop vehicle that reduces frequent occurrences of engine start and stop even when the vehicle is stopped for a long time. .

  In order to achieve the above object, according to the present invention, in an idle stop control device for a vehicle that automatically stops and automatically starts an engine while the vehicle is stopped, a charge amount detecting means that detects a charge amount of a battery and an engine driven. A battery charging device for charging the battery, a long-term stop with a long vehicle stop time, a vehicle stop time estimating means for determining a short-term stop with a short vehicle stop time, and a battery charge amount equal to or greater than a first predetermined value In this case, the automatic stop means for permitting the automatic stop of the engine is set, and the automatic stop means sets the first predetermined value larger at the time of long-term stop than at the time of short-term stop.

  In the idle stop control device for a vehicle according to the present invention, frequent start and stop of the engine when the vehicle is stopped for a long time can be reduced.

  The best mode for carrying out an idle stop control device for a vehicle according to the present invention will be described below with reference to the drawings.

  First, the configuration of the vehicle idle stop control device of the present embodiment will be described.

  FIG. 1 is an overall system diagram showing the configuration of a drive system and a control system of a vehicle equipped with a belt-type continuously variable transmission equipped with a vehicle idle stop control device according to the first embodiment.

  A vehicle equipped with a belt-type continuously variable transmission includes an engine 100, an oil pump 110 driven by the engine 100, an automatic transmission 120 that connects and disconnects power from the engine 100, and an output from the automatic transmission 120. And a left and right drive wheels 150 and 151 driven via a differential gear 140.

  The engine 100 includes a gasoline engine, a diesel engine, or the like. The power generation device may be a hybrid using not only an engine but also a motor. The engine 100 is connected to a starter motor 101 that starts the engine 100 and an alternator 102 that generates electric power using the power of the engine 100. The electric power generated by the alternator 102 is stored in the battery 160. The alternator 102 corresponds to the battery charging device of the present invention.

  The battery 160 is connected to an electric device 170 such as a starter motor 101, a wiper, an air conditioner, a defroster, or a headlight to supply electricity.

  In the oil pump 110, oil pressure is generated in the oil, and the pressure is adjusted by the control valve unit 111.

  The automatic transmission 120 includes a torque converter 121 that amplifies torque from the engine 100, a starting clutch 122 that connects and disconnects power, and a belt-type continuously variable transmission mechanism 123 that continuously changes power between an input side and an output side. With.

  The torque converter 121 transmits power directly during high-speed travel, a pump impeller connected to the engine output shaft 10, a turbine runner connected to the transmission input shaft 20, a stator that regulates the flow of internal hydraulic oil, and the like. And a lock-up clutch.

  Start clutch 122 has a plate interposed between a drive side connected to torque converter output shaft 30 and a driven side connected to continuously variable transmission mechanism input shaft 40. By applying clutch hydraulic pressure to a piston (not shown), this plate is pressed to allow power transmission between input and output, and by disengaging clutch hydraulic pressure acting on the piston, power cannot be transmitted to the output side portion. It is configured to be switchable to a released state.

  The belt type continuously variable transmission mechanism 123 is wound between a primary pulley 123a connected to the continuously variable transmission mechanism input shaft 40, a secondary pulley 123b connected to the continuously variable transmission output shaft 50, and a groove of each pulley. Belt 123c. The belt-type continuously variable transmission mechanism 123 is configured to shift by moving the movable sheaves of the pulleys relative to and away from the fixed sheaves.

  The torque converter 121, the starting clutch 122, and the belt type continuously variable transmission mechanism 123 are controlled by oil regulated by the control valve unit 111.

  Next, the control system of the vehicle equipped with the belt type continuously variable transmission according to the first embodiment will be described with reference to FIG.

  The control system includes an idle stop control device 200 that performs idle stop control, an engine control device 210 that controls the engine 100, an automatic transmission control device 220 that controls the automatic transmission 120, and a charge amount of the battery 160. A battery control device 230 that manages and controls the alternator 102 and an electronic control device 240 that integrates these control devices are provided.

  The electronic control unit 240 includes a water temperature sensor 206, a tilt sensor 241 that detects vehicle tilt, a brake fluid pressure sensor 242 that detects brake fluid pressure, and a negative pressure sensor 243 that detects the exhalation-side negative pressure of the engine 100. The brake pedal stroke sensor 244 for detecting the brake pedal stroke amount, the select lever sensor 245 for detecting the select position of the select lever, the water temperature sensor 206 for detecting the engine water temperature, and the oil temperature in the automatic transmission 120 are detected. And an oil temperature sensor 124 that detects the oil temperature in the automatic transmission 120 is connected. The electronic control device 240 manages signals input from the sensors or control signals in the control devices, and outputs necessary information to the control devices. The tilt sensor 241 corresponds to the tilt detection device of the present invention, and the select lever sensor 245 corresponds to the select lever position detection device of the present invention.

  The idle stop control device 200 outputs an idle stop command signal based on the engine water temperature, the transmission oil temperature, various brake signals, and the like.

  Engine control device 210 controls the power generation state (engine start / stop, engine output torque, engine speed, etc.) of engine 100 based on an idle stop command signal, an accelerator pedal opening signal, and the like.

  The automatic transmission control device 220 controls the automatic transmission 120 via the control valve unit 111 based on an accelerator rotation signal, a select lever signal, and the like.

  The battery control device 230 monitors the charge state of the battery 160 via the battery monitor 231 and controls the power generation state of the alternator 102. The battery monitor 231 corresponds to the charge amount detection device of the present invention.

  Next, the operation will be described.

[Overview of idle stop control]
The idle stop control device 200 stops the engine 100 when an idle stop permission condition described later is satisfied, and restarts the engine 100 when an idle stop prohibition request condition is satisfied.

<Idle stop permission conditions>
・ Vehicle speed = 0
-Assuming that all the doors are closed and all the above conditions are satisfied during engine operation, engine 100 is stopped when all of the following conditions are satisfied.

-The amount of charge of the battery 160 is a predetermined value or more (to ensure the driving force of the starter motor 101 at the time of restart).
・ Brake booster negative pressure is more than the specified value (to ensure master cylinder pressure)
-Engine water temperature is above a specified value (to ensure smooth restart)
・ The oil temperature in the automatic transmission 120 is higher than the specified value (to ensure smooth start control).
-The hydraulic pressure in the automatic transmission 120 is equal to or greater than a predetermined value (to ensure the shift response of the belt type continuously variable transmission mechanism 123).
Although the idle stop permission is instructed based on the above conditions, the idle stop permission may be instructed based on other conditions.

<Idle stop prohibition conditions>
・ Vehicle speed = 0
-Assuming that all the above conditions are satisfied while all doors are closed and during idling stop, engine 100 is restarted when any one of the following conditions is satisfied.

・ Acceleration ON
-The amount of charge of the battery 160 decreases (because it becomes difficult to secure the driving force of the starter motor 101 at the time of restart).
-Engine water temperature drop (because it is difficult to control smooth start)
・ Oil temperature drop in automatic transmission 120 (because it is difficult to ensure smooth start control)
・ Lower hydraulic pressure in the automatic transmission 120 (because it becomes difficult to secure the speed change response of the belt type continuously variable transmission mechanism 123)
Although it is instructed to prohibit idling stop based on the above conditions, it may be instructed to permit idling stop based on other conditions.

  In this embodiment, in addition to the above-described conditions for permitting and prohibiting idle stop, the charge amount condition of the battery 160 is changed depending on whether the vehicle is stopped for a long time or a short time.

  Specifically, the idle stop permission condition of the battery charge amount is set larger at the time of long-term stop than at the time of short-term stop. In addition, the idle stop prohibition condition for the battery charge amount is set smaller when the vehicle is stopped for a long time than when the vehicle is stopped for a short time. Further, when the vehicle is stopped for a long time, when idling stop control is started, idling stop is first prohibited regardless of the battery charge amount, and the alternator 102 is driven by the engine 100 to charge the battery charge amount to the idle stop permission condition. When the battery is charged during the long-term stop, the switches of the electric devices 170 such as the wiper, air conditioner, defroster, and headlight are turned off.

  Further, in the idle stop control of the present embodiment, the inclination sensor 241 is provided so that the idle stop control is not performed when the vehicle is stopped on the uphill road or the downhill road and the select lever is operated to the travel range.

  This idle step control will be described in detail below using a flowchart.

[Idle stop control]
When the vehicle stops on an uphill or downhill road, idle stop control is performed only when the select lever is operated to the non-traveling range. When the vehicle stops on a flat road, the select lever is Idle stop control is performed regardless of the travel range.

  FIG. 2 is a flowchart showing the flow of idle stop control in the idle stop control device 200.

  In step S101, it is determined whether or not the vehicle is stopped, that is, whether the vehicle speed V = 0. If YES, the process proceeds to step S102. If NO, this determination is repeated until the vehicle stops.

  In step S102, it is determined by the inclination sensor 241 whether the vehicle is stopping on an uphill road or a downhill road. If YES, the process proceeds to step S103, and if NO, the process proceeds to step S106.

  In step S103, a semi-automatic idle stop control is performed in which the idle stop control is performed only when the select lever is operated to the non-traveling range.

  In step S104, it is determined whether or not the select lever is in a non-traveling range (for example, P range or N range). If YES, idle stop control in the long-term stop mode described later is performed in step S105. End without idle stop control.

  In step S106, an automatic idle stop control is performed to perform idle stop control when the select lever is operated to the non-traveling range and the traveling range.

  In step S107, it is determined whether or not the select lever is in a non-traveling position (for example, P range or N range). If YES, long-term stop mode idle stop control described later is performed in step S108. In step S109, idle stop control in a short-term stop mode, which will be described later, is performed.

  Step S107 corresponds to the vehicle stop time estimating means of the present invention.

  Next, idle stop control in the long-term stop mode will be described.

[Long stop mode]
When the vehicle is stopped when the select lever is operated to the non-traveling position, idle stop control in the long-term stop mode is performed.

  In the long-term stop mode, the idle stop permission condition for the battery charge amount is set larger than that in the short-term stop mode described later, and the idle stop prohibition condition for the battery charge amount is set smaller than in the short-term stop mode described later. Therefore, during the long-term stop, the time for performing the idle stop becomes longer than during the short-term stop, and the number of engine stop and start can be reduced as compared with the short-term stop.

  Furthermore, since the switch of the electric device 170 is turned off while the battery 160 is being charged, the charging time of the battery 160 can be shortened.

  FIG. 3 is a flowchart showing the flow of idle stop control when the vehicle is stopped for a long time in the idle stop control device 200. In the flowchart of FIG. 3, for the sake of clarity, the charge amount of the battery 160 is mainly described, and other conditions are omitted.

  In step S201, an idle stop prohibition is instructed, and the process proceeds to step S120.

  In step S202, it is determined whether or not the engine 100 is stopped. If YES, the process proceeds to step S203, and if NO, the process proceeds to step S204.

  In step S203, the engine 100 is started and the routine proceeds to step S204.

  In step S204, the switch of the electric device 170 is turned OFF and the process proceeds to step S205.

  In step S205, the alternator 102 is driven to charge the battery 160.

  In step S206, it is determined whether or not the select lever is in the non-traveling position. If YES, the process proceeds to step S207. If NO, the idle stop control is terminated. That is, since the driver has operated the select lever to the travel position (for example, D range), it is determined that the vehicle has been requested to start, and the idle stop control is terminated.

  In step S207, it is determined whether or not the battery charge amount is 95% or more. If YES, the process proceeds to step S208 to command idle stop permission, and if NO, the process returns to step S201 to command idle stop prohibition. To do.

  In step S209, it is determined whether or not the engine 100 is stopped. If YES, the process proceeds to step S211 and the idle stop is continued. If NO, the process proceeds to step S210 and the engine 100 is stopped.

  In step S212, it is determined whether or not the select lever is in the non-travel position. If YES, the process proceeds to step S213. If NO, the process proceeds to step S214, and the engine 100 is started and the idle stop control is ended. To do.

  In step S213, it is determined whether or not the battery charge is 70% or less. If YES, the process returns to step S201 to prohibit idle stop, and if NO, the process proceeds to step S211 to continue long-term mode idle stop. To do.

  Next, the idle stop control in the short-term mode will be described.

[Short-term stop mode]
When the select lever is at the travel position (for example, D range) and the vehicle is stopped with the brake turned on, idle stop control in the short-term stop mode is performed.

  In the short-term stop mode, the idle stop permission condition for the battery charge amount is set smaller than that in the long-term stop mode, and the idle stop prohibition condition for the battery charge amount is set larger than that in the short-term stop mode. Therefore, during a short-term stoppage, the sufficient amount of battery charge is always supplied to the starter motor 101 to ensure engine restartability and to respond to situations such as temporary stop where immediate startability is required. ing. In addition, since the idle stop permission is instructed early, the idle stop can be executed even for a short time.

  In the short stop mode, the switch of the electric device 170 is kept ON while the battery 160 is being charged. This is because stopping the wiper or turning off the headlight when the vehicle is temporarily stopped may impair safety.

  FIG. 4 is a flowchart showing the flow of idle stop control when the vehicle is stopped for a short time in the idle stop control device 200. In the flowchart of FIG. 4, for the sake of clarity, the charge amount of the battery 160 is mainly described, and other conditions are omitted.

  In step S301, it is determined whether or not the brake is OFF. If YES, the idle stop control is terminated, and if NO, the process proceeds to step S302.

  In step S302, it is determined whether or not the battery charge is 80% or less. If YES, the process proceeds to step S303 to prohibit idle stop, and if NO, the process proceeds to step S309.

  In step S304, it is determined whether the engine 100 is stopped. If YES, the process proceeds to step S305 to start the engine 100, and if NO, the process proceeds to step S307.

  In step S305, the engine 100 is started and the process proceeds to step S307.

  In step S306, the alternator 102 is driven to charge the battery 160.

  In step S307, it is determined whether or not the brake is OFF. If YES, the idle stop control is terminated, and if NO, the process proceeds to step S308. That is, since the select lever is at the traveling position and the driver has turned off the brake, it is determined that the vehicle has been requested to start, and the idle stop control is terminated.

  In step S308, it is determined whether or not the battery charge amount is 90% or more. If YES, the process proceeds to step S309 to permit idle stop, and if NO, the process proceeds to step S306 to continue battery charging.

  In step S310, it is determined whether or not the engine is stopped. If YES, the process proceeds to step S312 to continue the idle stop, and if NO, the process proceeds to step S311 and the engine 100 is stopped.

  In step S313, it is determined whether or not the brake is OFF. If YES, the process proceeds to step S314 to start the engine 100 and end the idle stop control. If NO, the process returns to step S302, and the idle stop control in the short-term mode is repeated.

  It should be noted that step S207 in the long-term stop mode and step S308 in the short-term stop mode correspond to the first predetermined value of the present invention, and step S213 in the long-term stop mode and step S302 in the short-term stop mode correspond to the second predetermined value of the present invention. It corresponds to.

[Time chart of long-term mode]
FIG. 5 is a time chart of the idle stop control in the long-term stop mode. An alternate long and short dash line indicates a case where idle stop control similar to that during a short-term stop is performed even during a long-term stop.

  First, the time chart of the long-term mode will be described.

  When the vehicle stops at time t1 and the select lever is operated to the non-traveling position, the idle stop control is prohibited and the electric device 170 is turned off to start rapid charging.

  When the battery charge reaches 95% or more at time t2, charging is terminated and idling stop is permitted. At this time, the switch of the electric device 170 is also turned on.

  When the battery charge becomes 70% or less at time t3, the idle stop is prohibited again, and the electric device 170 is turned off to start the quick charge.

  When the battery charge reaches 95% or more at time t4, the charging is terminated and the idle stop is permitted. At this time, the switch of the electric device 170 is also turned on.

  The above is repeated until the select lever is operated to the travel position.

  Next, a case where idle stop control similar to the short-term stop mode is performed during a long-term stop will be described.

  As shown by the alternate long and short dash line, when the idle stop control is performed in the same way as in the short-term stop mode even when the vehicle is stopped for a long time, the battery charge is charged to 90% or more and then becomes 80% or less. As shown above, the battery charge amount is charged to 95% or more, and then the idle stop is performed once until it becomes 70% or less. The idle stop time is shortened. Further, in the idle stop control in the short-term stop mode, the switch of the electric device 170 is not turned off during the battery charging, so that it takes time to complete the battery charge compared to the case of performing the idle stop control in the long-term stop mode.

  Next, the effect of the vehicle idle stop control device of this embodiment will be described.

  (1) In the long-term stop mode, compared with the short-term stop mode, the amount of battery charge permitting idle stop is increased. Accordingly, the idling stop time for one time becomes longer during a long-term stop, and the number of automatic start of the engine 100 can be reduced. Therefore, the number of start and stop of the engine 100 can be reduced, and the driver feels uncomfortable. The ride comfort can be improved with less vibration.

  (2) Compared with the short-term stop mode, the battery charge amount for prohibiting idle stop is reduced in the long-term stop mode. Accordingly, the idling stop time for one time becomes longer during a long-term stop, and the number of automatic start of the engine 100 can be reduced. Therefore, the number of start and stop of the engine 100 can be reduced, and the driver feels uncomfortable. The ride comfort can be improved with less vibration.

  (3) When it is detected by the select lever sensor 245 that the select lever has been operated to the non-traveling position, it is determined that the vehicle has stopped for a long time, and the idle stop control in the long-term stop mode is performed. Therefore, when the vehicle is stopped for a relatively long time, the idle stop time for one time becomes longer, and the number of times of automatic start of the engine 100 can be reduced, so that the number of times of starting and stopping the engine 100 can be reduced. This reduces the sense of incongruity and reduces the vibration of the car body, improving ride comfort.

  (4) When it is detected by the select lever sensor 245 that the select lever has been operated to the travel position (for example, D range), it is determined that the vehicle is in a short-term stop and the idle stop control in the short-term stop mode is performed. Therefore, the idle stop control can be performed even when the vehicle is stopped in a relatively short time, and the fuel consumption can be improved and the exhaust gas emission can be suppressed.

  (5) In the idle stop control in the long-term stop mode, the switch of the electric device 170 is turned off when the battery is charged, so that the battery charging can be completed quickly. Therefore, the engine drive time during idle stop control can be shortened, fuel efficiency can be improved, and exhaust gas emission can be suppressed.

  (6) When the inclination sensor 241 determines that the vehicle is stopped on the uphill road and downhill road, the idle stop control is performed when the select range is operated to the non-travel position, and the travel position is operated. In some cases, idle stop control was not performed. Therefore, when starting the vehicle on an uphill road and a downhill road, the driver can step on and wait until the engine 100 is started, and it is not necessary to configure an automatic brake system such as a hill hold, thereby reducing costs. be able to.

  (7) Since the idle stop prohibition condition for the battery charge amount is set larger in the short-term stop mode than in the long-term stop mode, a sufficient battery charge amount to be supplied to the starter motor 101 can be secured, and the vehicle In the short-term stop mode with a short time, the startability of the engine 100 is ensured.

  (8) Since the idle stop permission condition of the battery charge amount is set smaller in the short-term stop mode than in the long-term stop mode, the idle stop permission can be instructed earlier. Therefore, the idle stop control can be performed even when the vehicle is stopped in a relatively short time, and the fuel consumption can be improved and the exhaust gas emission can be suppressed.

  As mentioned above, although the idle stop control apparatus of the vehicle of this invention has been demonstrated based on Example 1, it is not restricted to these Examples about a concrete structure, It concerns on each claim of a claim Design changes and additions are allowed without departing from the spirit of the invention.

  For example, in the first embodiment, the battery charge amount for permitting the idle stop control is 95% or more in the long-term stop mode and 90% or more in the short-term stop mode. However, it is sufficient that the battery charge amount for permitting the idle stop control is larger in the long-term mode than in the short-term mode.

  In the first embodiment, the battery charge amount for prohibiting the idle stop control is set to 70% or more in the long-term stop mode and 80% or more in the short-term stop mode. However, it is sufficient that the battery charge amount permitting the idle stop control is smaller in the long-term mode than in the short-term mode.

1 is an overall system diagram illustrating a drive system and a control system of a vehicle equipped with a belt-type continuously variable transmission to which an idle stop control device according to a first embodiment is applied. 3 is a flowchart illustrating a flow of idle stop control according to the first embodiment. It is a flowchart which shows the flow of the idle stop control of long-term mode based on Example 1. FIG. It is a flowchart which shows the flow of the idle stop control of short-term mode based on Example 1. FIG. 3 is a time chart of long-term mode idle stop control according to the first embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Engine 102 Alternator 122 Starting clutch 160 Battery 170 Electric equipment 200 Idle stop control device 241 Inclination sensor 245 Select lever sensor

Claims (6)

In a vehicle idle stop control device that automatically stops and automatically starts an engine while the vehicle is stopped,
A charge amount detection device for detecting a charge amount of the battery;
A battery charger that is driven by the engine and charges the battery;
Vehicle stop time estimation means for determining a long-term stop with a long vehicle stop time and a short stop with a short stop time of the vehicle;
Have
When the battery charge amount is greater than or equal to a first predetermined value, the automatic engine stop is permitted,
The vehicle idling stop control device, wherein the first predetermined value is set larger at the time of the long-term stop than at the time of the short-term stop. The idle stop control device for a vehicle according to claim 1,
The engine is automatically started when the battery charge amount is equal to or smaller than a second predetermined value smaller than the first predetermined value;
The vehicle idling stop control device, wherein the second predetermined value is set smaller during the long-term stop than in the short-term stop. In the vehicle idle stop control device according to claim 1 or 2,
It has a select lever position detection device that detects the select position of the select lever,
The vehicle stop time estimating means determines that the vehicle has stopped for a long time when the select lever is in a non-traveling position. The idle stop control device for a vehicle according to claim 3,
The vehicle stop time estimating means determines that the vehicle is stopped for a short time when the select lever is at the travel position and the brake is depressed. In the idle stop control device for a vehicle according to any one of claims 1 to 3,
An idle stop control device for a vehicle, wherein the drive of an electric device is stopped when the battery is charged for a long time. The idle stop control device for a vehicle according to any one of claims 1 to 4,
It has a tilt detection device that detects the tilt of the vehicle,
An idle stop control device for a vehicle, wherein when the inclination of the vehicle is detected by the inclination detection device, automatic stop of the engine is prohibited when the vehicle is stopped for a short time.

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