JP5767865B2 - Control device - Google Patents

Description

  The present invention relates to a control device for an internal combustion engine using an electric motor, and relates to start control.

  For example, in Patent Document 1, when an automatic stop of the engine rotation is detected, an ON signal is sent from the controller to the starter pinion engagement solenoid of the starter to engage the pinion with the ring gear while the engine is stopped. When the condition is established, the starter motor is energized to automatically start the engine, thereby improving durability and reducing noise.

Japanese Patent Laid-Open No. 11-030139

  However, in the above-described prior art, when the solenoid for controlling the pinion engagement of the starter is energized, the solenoid may overheat, the holding power decreases, and further, the engine restart failure due to the remaining battery level may become a problem.

It is an object of the present invention to pre-engage the starter pinion, such as solenoid overheating and holding power decrease due to prolonged energization period and constant driving force, engine restart failure, and catalyst temperature decrease due to idle stop. Another object of the present invention is to provide an internal combustion engine start control device and control method that solve the problem of restarting the engine .

In order to achieve the above object, a control device of the present invention controls a starter including a pinion, a motor for rotating the pinion, and a solenoid for moving the pinion to the ring gear side of the internal combustion engine, and the internal combustion engine After shutting off the fuel supply to before the start condition of the internal combustion engine based on the operation of the driver is established, the pinion is engaged and connected to the ring gear by energizing the solenoid, and after the start condition is satisfied, In the control device for starting the internal combustion engine by rotating the pinion by the motor, the starter includes a first relay for controlling energization and de-energization to the solenoid, and energization and de-energization to the motor. A second relay for controlling the first relay and the second relay, wherein the control device connects the first relay and the second relay to individual signal lines. The pinion and the ring gear are controlled independently, and when the connection by the engagement of the pinion and the ring gear continues for a predetermined time or more, even when the start condition based on the operation of the driver is not satisfied, the pinion The connection between the pinion and the ring gear is released after the motor is operated and the internal combustion engine is started without releasing the connection between the ring gear and the ring gear. .

  More preferably, the determination value of the next connection instruction time is increased in proportion to the connection release time.

  More preferably, during the connection, the determination value of the next connection instruction time is decreased.

  Further, the above-described problem is an internal combustion engine having an electric motor having connection means for connecting to the internal combustion engine and stop means for stopping the internal combustion engine when a predetermined stop condition is satisfied, and instructing the connection means to connect to the internal combustion engine. The engine starting device and the internal combustion engine have means for injecting and igniting fuel to the cylinder, and determining the motion state of the internal combustion engine and stopping the operation of the electric motor based on the determination result. .

  Further, the above-described problem is an internal combustion engine having an electric motor having connection means for connecting to the internal combustion engine and stop means for stopping the internal combustion engine when a predetermined stop condition is satisfied, and instructing the connection means to connect to the internal combustion engine. This can also be achieved by fastening the connection means until the complete explosion determination of the internal combustion engine even after the operation of the engine is stopped and the operation of the electric motor is stopped.

  Further, the above-described problem is an internal combustion engine having an electric motor having connection means for connecting to the internal combustion engine and stop means for stopping the internal combustion engine when a predetermined stop condition is satisfied, and instructing the connection means to connect to the internal combustion engine. This is also achieved by instructing connection to the connecting means after the engine starter and the fuel supply to the internal combustion engine are shut off and before the internal combustion engine stops.

The above-mentioned subject is also achieved by having a driving force switching means for switching the driving force for connection of the connecting means to the internal combustion engine based on the operating state of the internal combustion engine.

  Further, the above-described problem is an internal combustion engine having an electric motor having connection means for connecting to the internal combustion engine and stop means for stopping the internal combustion engine when a predetermined stop condition is satisfied, and instructing the connection means to connect to the internal combustion engine. This can also be achieved by connecting the engine starting device and the connection means after the internal combustion engine is stopped, and driving the electric motor to bring the piston of the internal combustion engine to a predetermined position.

  Further, the above-described problem is an internal combustion engine having an electric motor having connection means for connecting to the internal combustion engine and stop means for stopping the internal combustion engine when a predetermined stop condition is satisfied, and instructing the connection means to connect to the internal combustion engine. In the engine starting device, this is also achieved by prohibiting the driving of the electric motor for a predetermined time after driving the connecting means.

According to the present invention, the problem of restarting the engine by previously meshing the starter pinion can be avoided, and the internal combustion engine start control device and control method for meshing the pinion with the ring gear while the engine is stopped are provided. There is an effect that can be provided.

The block diagram which shows an example of the control apparatus (ECU) of an internal combustion engine. The time chart which shows operation of a pinion and a motor at the time of idle stop and starting. The table | surface which shows the operation pattern of the pinion and the motor at the time of idle stop and start. Scheduled processing that starts every 10 milliseconds. The detailed flow of idle stop control (step 101). The detailed flow of an engine stop process (step 113). The detailed flow of an engine operation process (step 114).

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an example of an internal combustion engine start control device (ECU) that is mounted on a vehicle and controls an engine (internal combustion engine) and a starter. In FIG. 1, an ECU 1 includes an input circuit 2, a microcomputer 3 for calculating engine and starter control targets based on such information, and a drive circuit 4 including FETs.

  The input signal is a sensor signal including an engine start switch 5, a brake switch 6, an accelerator and a rotation sensor. The output signal includes a starter system and an engine system.

  The starter pushes out the pinion 8 by the solenoid 7 and is engaged with the ring gear 9 of the engine to be coupled to the engine in advance. In order to reduce the collision noise between the pinion 8 and the ring gear 9 and the temperature rise of the solenoid 7, a relay 11 for weakly coupling with a resistor is provided in addition to the relay 10 for coupling strongly. Further, the motor 12 for turning the engine is provided with a relay 14 for slowly turning it with a resistor in addition to the relay 13 for starting the engine in order to make the piston stop position optimal for restarting.

  The engine includes a throttle for changing the air amount, an injector for changing the fuel injection amount, a plug for changing the combustion timing, and the like.

  The ECU 1 is connected to other control devices such as the transmission control device 15 by CAN communication and receives vehicle speed information and the like.

  FIG. 2 is a time chart showing the operation of the pinion 8 and the motor 12 at the time of idling stop and engine start, and FIG. 3 is a table showing an operation pattern, and the operation will be described using them.

  When the start switch 5 is turned on, the relay 10 of the pinion 8 is turned on to engage the pinion 8 (connection, d), and after 70 milliseconds, the relay 13 of the motor 12 is turned on and the engine is turned (assist, e). When the rotational speed N2 at which the engine can be started even without the assisting force of the motor 12 is reached, the relay 13 of the motor 12 is turned off (waiting for complete explosion, f), and when the rotational speed N3 at which the engine has been started reliably is reached, the pinion 8 The relay 10 is turned off (assist end, g).

  When the brake pedal is depressed and the vehicle speed becomes 0 and 1 second has elapsed, the fuel supply to the engine is cut so that the engine stops idling (engine stop, a). When the engine speed drops to N1, the relay 11 of the pinion 8 is turned off. Turn on and bit the pinion 8 with a small impact (pre-connection, b). Thereafter, when the brake pedal is released, in preparation for running, the relay 10 of the pinion 8 and the relay 13 of the motor 12 are turned on and the engine is restarted by the same procedure as when the start switch 5 is turned on.

  When the engine is stopped and the piston stop position is not optimal for restarting, the relay 10 of the pinion 8 and the relay 14 of the motor 12 are turned on for a time corresponding to the deviation amount and the engine is turned ( Alignment, c), correct the piston position.

  As a condition for restarting the engine, in addition to releasing the brake pedal, the timer for measuring the remaining energized time provided for heat generation protection of the solenoid 7 may become zero. This timer is decreased at regular intervals while the solenoid 7 is energized, and is increased at regular intervals while the energization is stopped.

  The operation of FIG. 2 is realized by incorporating the program of the flowcharts of FIGS. 4 to 7 into the microcomputer 3.

  FIG. 4 shows a scheduled process that starts every 10 milliseconds. In step 100, the sensor signal including the start switch 5, the brake switch 6 and the accelerator is captured. In step 101, the idle stop control detailed in FIG. 5 is performed.

  Based on the information acquired in step 100, the throttle opening is adjusted in step 102 to optimally control the amount of air, in step 103 the fuel injection amount in the injector injection time, and in step 104, the plug ignition timing and the like are optimally controlled.

  In step 105, information transmission / reception such as reception of vehicle speed information from the transmission control device 15 is performed by CAN communication.

  FIG. 5 is a detailed flow of idle stop control (step 101). In step 110, it is determined whether the protection timer of the solenoid 7 has become 0. If false, it is determined in step 111 whether the brake switch 6 is on. If true, the vehicle speed is 0 (stopped) in step 112. ) Determine if 1 second has passed. If true, the mode selection process related to the engine stop described in FIG. 6 is performed in step 113, and if false, the mode selection process related to the engine operation described in FIG. 7 is performed in step 114. In step 115, the starter pinion 8 and the motor 12 are controlled via those relays in accordance with the mode determined in step 113 or step 114.

  FIG. 6 is a detailed flow of the engine stop process (step 113). In step 120, it is determined whether the engine speed is lower than a predetermined value N1. If true, it is determined whether the engine is not stopped or the piston stop position is the optimum position for restart. If false, the process proceeds to step 122 and the alignment (c) in FIG. 3 is performed. If true, the process proceeds to step 123 and the pre-connection (b) in FIG. 3 is selected. If step 120 is false, the process proceeds to step 124 and the engine stop (a) in FIG. 3 is selected.

  FIG. 7 is a detailed flow of the engine operation process (step 114). In step 130, it is determined whether 0.1 second has elapsed after energization of the solenoid 7 of the pinion 8, and if true, it is determined whether the engine speed is lower than a predetermined value N2. If false, it is determined whether the engine speed is lower than a predetermined value N3 higher than the predetermined value N2. In the case of false, it is determined that the engine has been reliably started, and the process proceeds to step 133, and the assist end (g) in FIG. 3 is selected. In the case of true, the process proceeds to step 134 and waiting for complete explosion (f) in FIG. If true in step 131, the process proceeds to step 135 and assist (e) in FIG. 3 is selected. If false in step 130, the process proceeds to step 136 and connection (d) in FIG. 3 is selected.

  In step 110, it is determined whether the remaining time of the protection timer of the solenoid 7 has become 0. In step 114, the engine can be operated to protect the solenoid 7 from overheating.

  Although the idle stop time is shortened and the fuel efficiency effect is impaired, it is possible to prevent the exhaust performance from deteriorating due to the decrease in the catalyst temperature due to the idle stop.

  The present invention can be applied to a start control device for an internal combustion engine in which a pinion meshes with a ring gear while the engine is stopped.

1 ECU
2 Input circuit 3 Microcomputer 4 Drive circuit 5 Engine start switch 6 Brake switch 7 Solenoid 8 Pinion 9 Ring gear 10, 11, 13, 14 Relay 12 Motor 15 Transmission control device

Claims (10)

Controlling a starter comprising a pinion, a motor for rotating the pinion, and a solenoid for moving the pinion to the ring gear side of the internal combustion engine;
After fuel cut off to the internal combustion engine, before establishment start condition of the internal combustion engine based on a driver's operation, connect by bitten the pinion to the ring gear by energizing the solenoid, the starting condition After the establishment, in the control device for starting the internal combustion engine by rotating the pinion by the motor ,
The starter includes a first relay for controlling energization and de-energization of the solenoid;
A second relay for controlling energization and de-energization of the motor,
The control device controls the first relay and the second relay independently at different timings via individual signal lines,
When the connection between the pinion and the ring gear continues for a predetermined time or longer , even when the start condition based on the operation of the driver is not satisfied, the connection with the pinion and the ring gear is engaged. A control apparatus, wherein the motor is operated without being released to start the internal combustion engine, and then the connection between the pinion and the ring gear is released . After satisfied the start condition, by rotating the motor even without assist force of the motor to stop the rotation of the motor when the internal combustion engine is ready to start, when the internal combustion engine has complete explosion The control device according to claim 1, wherein the connection by biting between the pinion and the ring gear is released. 3. The control device according to claim 1, wherein a determination value of a next connection instruction time is increased in proportion to a connection release time due to engagement of the pinion and the ring gear. 4. The control device according to claim 1, wherein a determination value of a next connection instruction time is decreased during connection by biting of the pinion and the ring gear. 5. A driving force switching means for switching the connection means to connect the internal combustion engine to the plurality of internal combustion engines, and the driving force for connecting the pinion and the ring gear to rotate the internal combustion engine with the motor; 5. The control device according to claim 1, wherein the control device is smaller than the driving force of the control device . 6. The control device according to claim 1, wherein after the pinion is connected to the ring gear, the motor is driven to bring the piston of the internal combustion engine into a predetermined position. 6. 7. The control device according to claim 1, wherein the driving of the motor is prohibited for a predetermined time after the pinion is driven. The control device according to claim 5, wherein the driving force switching means includes a relay for controlling on / off of energization to the solenoid. 9. The control device according to claim 5, wherein the driving force switching unit includes a resistor for changing an energization current to the solenoid. After satisfied the start condition, by rotating the motor even without assist force of the motor to stop the rotation of the motor when the internal combustion engine is ready to start, when the internal combustion engine has complete explosion The control device according to claim 1, wherein the connection unit and the internal combustion engine are disconnected.