JP6091264B2 - Control device for idle stop car - Google Patents

Description

  According to the present invention, when a predetermined engine stop condition including that the road surface inclination is within a predetermined permissible inclination range is satisfied, the engine is stopped and controlled to the idle stop state, and the predetermined engine restart condition is set in the idle stop state. The present invention relates to a control device for an idle stop vehicle provided with an idle stop control means for restarting an engine when is established.

  A so-called idle stop vehicle starts an engine by turning on an IG (ignition), and thereafter executes idle stop control until the engine stops by turning off an IG, and the engine is stopped when a predetermined engine stop condition is satisfied. The engine is automatically stopped and the engine is automatically restarted when a predetermined engine restart condition is satisfied.

  In this type of idle stop vehicle, in order to prevent the vehicle from sliding down when stopped on an uphill road, the restart of the engine is completed before the vehicle sliding distance exceeds the allowable distance (= La). It is considered to perform control for starting engine restart (see Patent Document 1).

JP 2012-7554 A (refer to paragraph 0008 and others)

  However, even if the engine restart is started so that the restart of the engine is completed before the sliding distance of the vehicle exceeds the allowable distance as in Patent Document 1 described above, the restart of the engine is not completed. The time required for start-up varies depending on conditions such as the number of starter starts, the degree of deterioration based on the battery voltage and temperature, and the engine water temperature, so the slip-down distance exceeds the allowable distance and the vehicle on the uphill road In some cases, sliding down cannot be reliably prevented.

  Also, for example, when the starter or battery deteriorates and the engine restart takes time and the drag exceeds the allowable distance, the idle stop control should be stopped. If the engine is automatically stopped by idle stop control without considering the degree of slope of the road surface, and then the engine is restarted as described above, it takes time to complete the engine restart and the vehicle exceeds the allowable distance. There is a problem of falling down.

  The present invention changes the slope range to a small value when the estimated time until the engine restart is completed and makes it difficult for the engine to be automatically stopped when the road surface slope exceeds the permitted slope range, while the road surface within the permitted slope range. The purpose is to reliably prevent the vehicle from sliding down when the engine is restarted after the engine is automatically stopped.

  In order to achieve the above-described object, the control device for an idle stop vehicle according to the present invention stops the engine by satisfying a predetermined engine stop condition including that the road surface inclination is within a predetermined permitted inclination range. In an idle stop vehicle control device comprising an idle stop control means for controlling to a stop state and restarting the engine when a predetermined engine restart condition is established in the idle stop state, the idle stop control means includes the When it is determined that the starting time from when the engine is restarted until it reaches a complete explosion state is longer than a predetermined time based on the state of the on-vehicle equipment necessary for engine restart, The range is changed small (claim 1).

  According to the first aspect of the present invention, the engine is controlled by the idle stop control means based on the state of the on-vehicle equipment necessary for restarting the engine, for example, the starter start frequency, battery voltage / temperature, engine cooling water temperature, and the like. When it is determined that the starting time from the restart to the complete explosion state is longer than the specified time, the allowable inclination range of the road surface inclination is changed to be small by the idle stop control means.

  Therefore, in an idle stop vehicle that includes that the road surface slope is within the permitted slope range in the engine stop condition, when it is determined that the start time until the engine restart is in a complete explosion state is longer than the specified time, the road surface slope The engine can be controlled so that it does not stop automatically when it exceeds the permitted inclination range after a small change, while the engine is automatically restarted on the road surface within the permitted inclination range, and the engine is restarted quickly. It is possible to reliably prevent the vehicle from sliding down.

It is a block diagram of one embodiment of a control device of an idle stop car of the present invention. It is a flowchart for operation | movement description of FIG.

  Next, an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the idle stop vehicle 1 has a single lead battery 2 having a relatively small capacity of 12 V as a power source in order to reduce the weight, the size, and the like. It is connected to the vehicle body of the stop vehicle 1.

  The engine 3 as a drive source of the idle stop vehicle 1 has a transmission-side CVT (Continuously Variable Transmission) 4, and a torque converter (including a lock-up clutch mechanism) 5 is provided between the CVT 4 and the engine 3. Is intervening.

  The engine 3 is started by a starter 6. The starter 6 is supplied with power from the battery 2 via a relay 7 and generates a driving force for starting the engine 3. Further, a battery sensor 8 provided close to the battery 2 between the positive terminal of the battery 2 and the relay 7 outputs a temperature / current detection signal of the battery 2 to an idle stop control unit described later, and the engine 3 Is transmitted to the alternator 9, which is a generator, via the belt 10, and the battery 2 is charged by the power generation output of the alternator 9 while the vehicle is running.

  Further, as shown in FIG. 1, a water temperature sensor 11 for detecting the cooling water temperature of the engine 3 and an oil temperature sensor 12 for detecting the oil temperature of the CTV 4 are provided, and a G sensor 13 for detecting the inclination of the road surface is provided. The signal from the water temperature sensor 11 is provided by an engine control unit, which will be described later, the signal from the oil temperature sensor 12 is provided by a CVT control unit, which will be described later, and the signal from the G sensor 3 is provided by an idle stop control unit, which will be described later. It is captured.

  Further, as shown in FIG. 1, the idle stop vehicle 1 is provided with an idle stop control unit (corresponding to the idle stop control means in the present invention) 14 formed by the idle stop control ECU, and the engine control ECU An engine control unit 15 formed, an ABS control unit 16 formed by an ABS (Antilocked Braking System) control ECU, and a CVT control unit 17 formed by a CVT control ECU are provided. Each of the control units 14 to 17 is a microcomputer. Etc., and exchanges information via a communication bus B such as CAN.

  Then, the idle stop control unit 14 determines a predetermined engine stop condition including a road surface inclination within a predetermined allowable inclination range (for example, the road surface is within the allowable inclination range, the stop lamp is lit, and the vehicle speed is equal to or lower than the predetermined vehicle speed. If it is confirmed that the condition is less than a predetermined deceleration), the engine control unit 15 causes the engine to control the engine 15 when the vehicle speed is reduced to a predetermined vehicle speed or less (for example, 7 km / h or less) without stopping completely. A stop command is output and the engine 3 is automatically stopped. Subsequently, when the driver removes his / her foot from the brake pedal in the automatic stop state, it is confirmed by the idle stop control unit 14 that a predetermined engine restart condition is satisfied, and the stopped engine 3 is automatically restarted. The

  Further, as shown in FIG. 1, a vehicle speed sensor 18 is provided which detects the vehicle speed and gives the vehicle speed information to the ABS control unit 16, and provides the ABS control unit 16 with detection information of the master cylinder pressure of the brake mechanism. 19, a steering angle sensor 20 for detecting the steering angle of the steering wheel is provided, a display unit 21 formed by a combination meter is provided on the dashboard, and various display data received via the communication bus B are stored. It is displayed on the display unit 21.

  By the way, the ABS control unit 16 controls a brake fluid pressure control valve (for example, a solenoid valve) downstream of the master cylinder (not shown) at the time of a sudden brake operation by a driver or a brake operation on a low friction road, and brakes for each wheel. Brake control is executed to control the force and prevent sliding due to wheel lock.

  An idle stop operation of the idle stop vehicle 1 having such a configuration will be briefly described. When a driver turns on an IG key (not shown) to instruct an engine start, an IG on signal is transmitted to a communication bus, for example. B is input to the idle stop control unit 14, and based on this input, the idle stop control unit 14 instantaneously energizes the relay 7 to turn it on, and feeds the power of the lead battery 2 to the starter 6 to start the starter 6. Then, the stopped engine 3 is started (initial start). Once the engine 3 is started and the battery 2 is once fully charged with the power generated by the alternator 9, the idle stop control unit 14 then performs idle stop control until the engine 3 is stopped by turning off the IG key. Execute.

  The idle stop control unit 14 includes information on the engine control unit 15 (engine information such as the engine speed and engine cooling water temperature), information on the current and temperature of the battery 2, and the ABS control unit via the communication bus B. 16, information on the vehicle speed detected by the vehicle speed sensor 18, information on the master cylinder pressure by the hydraulic pressure sensor 19, information on the lock-up clutch of the CVT control unit 17, information on switches in various parts of the vehicle such as a stop lamp switch and a courtesy switch (not shown) Etc. are input.

  Based on this information, the idle stop control unit 14 during idle stop control confirms that the driver depresses the brake pedal in accordance with a traffic light red signal or the like, and that the master cylinder pressure is equal to or higher than a predetermined depressing pressure. When detected, by confirming that a predetermined engine stop condition for idle stop control (for example, a condition that the stop lamp is lit and the vehicle speed is equal to or lower than the predetermined vehicle speed) is satisfied, the predetermined vehicle speed can be maintained even if the travel is not completely stopped. If it falls below (for example, 7 km / h or less), an engine stop command will be output to the engine control part 15, and the engine control part 15 will throttle a fuel throttle, and the engine 3 will be stopped automatically.

  Here, a signal corresponding to the road surface inclination is output from the G sensor 13 to the idle stop control unit 14, and the idle stop control unit 14 detects and detects the inclination of the stopped road surface based on the signal from the G sensor 13. It is determined whether or not the road inclination is within a predetermined allowable inclination range, and if it is within the allowable inclination range, it is determined that one of the engine automatic stop conditions is satisfied, while the detected road inclination is predetermined. When the inclination range is exceeded, idle stop control for automatically stopping the engine 3 is not executed because the engine automatic stop condition is not satisfied.

  Next, when it is detected that the driver has released his / her foot from the brake pedal and the master cylinder pressure has dropped to a predetermined release pressure, for example, the traffic signal has changed to a green light, the idle stop control unit 14 performs a predetermined idle stop control. After confirming that the engine restart condition is satisfied, the idle stop control unit 14 energizes the relay 7 instantaneously to turn it on, supplies the power of the battery 2 to the starter 6, starts the starter 6, and stops the engine 3. Will automatically restart. Thereafter, automatic stop of the engine 3 based on establishment of a predetermined engine stop condition during deceleration and automatic restart of the engine 3 based on establishment of a predetermined engine restart condition are alternately performed.

  At this time, when the engine 3 is restarted, when the engine speed information reaches the speed indicating complete explosion and the engine reaches the complete explosion state, the brake force returns to the original state that changes according to the master cylinder pressure. The state where there is no stepping is a so-called idling state, and even in this idling state, a creep force that can start the idle stop vehicle 1 is generated by the engine 3 and the torque converter 5.

  By the way, when the idle stop control unit 14 executes the above-described idle stop control, as shown in FIG. 3, the start count of the starter 6 counted by a counter or the like built in the idle stop control unit 14, the battery sensor 8 Information on the current state of various in-vehicle devices such as the voltage and temperature of the battery 2 and the engine cooling water temperature by the water temperature sensor 11 via the engine control unit 15 is taken in, and the starter 6 that is in-vehicle devices necessary for restarting the engine 3 is started. Based on the current state such as the number of times, the voltage / temperature of the battery 2 and the cooling water temperature of the engine 3, the start time from when the engine 3 is restarted until it reaches the complete explosion state is derived (step S1).

  At this time, the degree of deterioration of the starter 6 and the battery 2 can be determined from the number of times the starter 6 is started and the voltage / temperature of the battery 2, and the engine 3 is restarted depending on the degree of deterioration of the starter 6 and the battery 2 and the cooling water temperature of the engine 3. The start time required until the complete explosion is experimentally determined in advance, mapped and stored in a memory or the like, and the start time corresponding to the current starter 6 and battery 2 deterioration degree and the engine 3 cooling water temperature It is desirable to read and derive from the map.

  As shown in FIG. 3, the idle stop control unit 14 determines whether the start time of the engine 3 is longer than a predetermined specified time corresponding to the deterioration degree of the starter 6 and the battery 2 and the coolant temperature of the engine 3. When it is determined (step S2) and it is determined that the length is longer (YES in step S2), the allowable inclination range related to the road surface inclination, which is a stop condition of the engine 3 in the idle stop control, is changed to be small (step S3).

  In this case, if the allowed start range of the starter 6 exceeds, for example, 200,000 times (−20 ° to + 20 °) as a steady range, it may be changed to a small (−10 ° to + 10 °). Similarly to this, the voltage, temperature, and engine coolant temperature of the battery 2 may be changed to a small value depending on whether or not each value is higher than a certain value. As another example, when the starter 6 starts from 0 to 100,000 times, it is (-15 ° to + 15 °) one step smaller than the steady range, and from 100,000 to 200,000 times, What is necessary is just to change in two steps, such as (-10 ° to + 10 °), and further, from 200,000 times to 300,000 times, (−5 ° to + 5 °) and three steps. Similarly, the voltage may be changed in small steps in accordance with the voltage, temperature, and engine coolant temperature of the battery 2.

  Thus, by changing the allowable inclination range to be small, when the road surface inclination exceeds the allowable inclination range, it is possible to control the engine so that it is not automatically stopped, and it is expected that the engine may slide down when the engine is restarted. Idle stop control is not executed. On the other hand, on the road surface where the road surface inclination is within the allowable inclination range, the idle stop control is executed and the engine 3 can be restarted quickly after the engine 3 is automatically stopped, so that the vehicle is prevented from sliding down when the engine is restarted. .

  Therefore, according to the above-described embodiment, the idle stop control unit 14 is based on the start count of the starter 6 which is an in-vehicle equipment necessary for restarting the engine 3, the voltage / temperature of the battery 2, the cooling temperature of the engine 3, and the like. Thus, when it is determined that the start time from when the engine 3 is restarted until the complete explosion state is reached is longer than the specified time, the allowable inclination range of the road surface inclination is changed to be small by the idle stop control unit 14, so the road surface inclination Can be controlled so that the engine 3 is not automatically stopped when it exceeds the permitted inclination range after the change is made small, while restarting after the engine 3 automatically stops on the road surface within the permitted inclination range can be performed quickly. This makes it possible to reliably prevent the vehicle from sliding down when the engine is restarted.

  The present invention is not limited to the above-described embodiment, and various modifications other than those described above can be made without departing from the spirit thereof. It is not limited to the above.

  In the above-described embodiment, the starter 6, the battery 2, and the engine 3 are exemplified as the in-vehicle equipment necessary for restarting the engine. However, the in-vehicle equipment is not limited to these.

1 ... Idle stop car 2 ... Battery (vehicle equipment)
3 ... Engine (vehicle equipment)
6 Starter (vehicle equipment)
14: Idle stop control unit (idle stop control means, prediction means)

Claims (1)

When a predetermined engine stop condition including that the road surface inclination is within a predetermined allowable inclination range is satisfied, the engine is stopped and controlled to the idle stop state, and the predetermined engine restart condition is satisfied in the idle stop state. In an idle stop vehicle control device comprising idle stop control means for restarting the engine by
The idle stop control means, based on the state of the on-vehicle equipment necessary for restarting the engine, when the start time from when the engine is restarted until it reaches a complete explosion state is longer than a predetermined specified time A control device for an idle stop vehicle, wherein when judged, the permitted inclination range is changed to be small.

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