WO2012035614A1 - 車両走行制御装置 - Google Patents
車両走行制御装置 Download PDFInfo
- Publication number
- WO2012035614A1 WO2012035614A1 PCT/JP2010/065816 JP2010065816W WO2012035614A1 WO 2012035614 A1 WO2012035614 A1 WO 2012035614A1 JP 2010065816 W JP2010065816 W JP 2010065816W WO 2012035614 A1 WO2012035614 A1 WO 2012035614A1
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- vehicle
- engine
- power
- power source
- current
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
- F02D29/02—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
Definitions
- the present invention relates to a vehicle travel control device.
- a device that performs such a maintenance operation has a large variation in power consumption depending on a device to be operated and a situation at the time of operation. In this case, it is necessary to secure sufficient electric power for appropriately operating the apparatus that performs such a maintenance operation while performing inertial traveling in consideration of the possibility of power shortage.
- the present invention has been made in view of the above, and an object of the present invention is to provide a vehicle travel control device capable of more reliably achieving both improvement in fuel efficiency and maintenance operation during vehicle travel.
- the vehicle travel control device causes a vehicle that travels with power generated by a power source to travel with inertia while the power source is stopped.
- the power source is activated.
- the vehicle travel control device predicts the operation of the vehicle maintenance device during travel of the vehicle traveling by the power generated by the power source. In such a case, the power source is stopped and traveling by inertia is prohibited.
- a vehicle travel control device causes a vehicle that travels with power generated by a power source to travel with inertia by stopping the power source.
- the power source is activated before the vehicle maintenance device is activated.
- the vehicle travel control device when the vehicle maintenance device operates during the travel of the vehicle traveling by the power generated by the power source, Before the vehicle maintenance device is operated, the power source is stopped and traveling by inertia is prohibited.
- the power source includes a power generation device that generates power during operation of the power source, and the power source is activated when the power source is activated when the vehicle maintenance device is operated. It is preferable to increase the amount of power generated by the power generation device by increasing the rotational speed of the power generation device.
- the vehicle maintenance device is an occupant protection device capable of protecting an occupant of the vehicle when the vehicle may collide with an obstacle.
- the vehicle maintenance device is a stable travel control device that stabilizes a travel state during travel of the vehicle.
- the vehicle maintenance device is a purification means heating device that heats a purification means that purifies exhaust gas discharged during operation of the power source.
- the vehicle travel control device has an effect that it is possible to more reliably achieve both improvement in fuel efficiency and maintenance operation during vehicle travel.
- FIG. 1 is a schematic diagram of a vehicle including the vehicle travel control apparatus according to the first embodiment.
- FIG. 2 is an explanatory diagram of a vehicle speed range in which engine stop permission or stop prohibition is performed.
- FIG. 3 is an explanatory diagram of a vehicle speed range in which engine stop permission or stop prohibition is possible when there is a possibility of a collision.
- FIG. 4 is a time chart during pre-crash safety control.
- FIG. 5 is a schematic diagram of a vehicle including the vehicle travel control apparatus according to the second embodiment.
- FIG. 6 is an explanatory diagram showing the relationship between the supply current including the amount of power generated by the alternator and the load current.
- FIG. 7 is an explanatory diagram showing the relationship between the rotational speed of the alternator and the current generated by the alternator.
- FIG. 1 is a schematic diagram of a vehicle including the vehicle travel control apparatus according to the first embodiment.
- the vehicle 1 including the vehicle travel control device 2 according to the first embodiment shown in FIG. 1 is provided with an engine 3 that is an internal combustion engine as a power source during travel, and the engine 3 is provided via a clutch 6. It is connected to a stepped transmission 8.
- the transmission 8 is connected to drive wheels (not shown) via a power transmission path such as a drive shaft (not shown).
- the engine 3 is provided with an alternator 10 that is a power generation device that generates electricity used in each electric device of the vehicle 1.
- the alternator 10 is operated by the power generated by the engine 3 during operation of the engine 3 and can generate electric power.
- the electricity generated by the alternator 10 is only supplied to the electric device of the vehicle 1. Instead, it is supplied to a battery 16 that is a power storage means mounted on the vehicle 1.
- the battery 16 stores the electricity by charging the electricity supplied from the alternator 10, and can supply the stored electricity to each electric device.
- Each electric device included in the vehicle 1 is operated by electricity supplied from the alternator 10 and the battery 16 in this way.
- the battery 16 is connected to a battery state detection device 18 that is a storage means state detection unit that detects the state of the battery 16 such as the current and voltage flowing from the battery 16 and the temperature of the battery 16.
- the engine 3 includes a starter 12 that is an internal combustion engine starting means that can start the engine 3 by inputting rotational torque to a crankshaft (not shown) of the engine 3 when the engine 3 is stopped. Is provided.
- the starter 12 is provided by an electric motor that is operated by electricity supplied from the battery 16 and a transmission mechanism that transmits motive power generated by the electric motor to the engine 3. In the starter 12 provided in this way, the electric motor is operated by electricity from the battery 16, and the power generated by the electric motor is transmitted from the transmission mechanism to the crankshaft of the engine 3 in a stopped state. Is rotated to start the engine 3.
- the vehicle 1 is provided with an electric power steering (EPS) 20 that is an electric power steering device.
- EPS 20 is operated by electricity to assist the steering operation by generating an assist torque when the driver performs the steering operation.
- the vehicle 1 is provided with a pre-crash safety system (PCS) 22 that protects an occupant when the vehicle 1 is traveling.
- This PCS 22 is a radar 24 that is a front situation detection means for detecting a preceding vehicle that travels in front of the vehicle 1, an obstacle positioned in the traveling direction, and a vehicle maintenance device that improves safety when the vehicle 1 is traveling.
- an actuator 26 is provided as an occupant protection device that can protect an occupant of the vehicle 1 when the vehicle 1 may collide with a preceding vehicle.
- the radar 24 may be of any type as long as it can be mounted on the vehicle 1 such as a laser radar using a laser as a detection wave or a millimeter wave radar using a millimeter wave.
- the EPS 20, the actuator 26, and the starter 12 are provided to be operable by electricity, and the electricity generated by the alternator 10 can be charged by the battery 16. For this reason, the alternator 10 and the battery 16 are electrically connected, and the starter 12, the EPS 20, and the actuator 26 are also electrically connected to the alternator 10 and the battery 16.
- the vehicle 1 is equipped with an ECU (Electronic Control Unit) for controlling each part of the vehicle 1 as well as being connected to each engine and device provided as described above.
- ECU Electronic Control Unit
- the hardware configuration of the ECU that can control each unit in this manner is a known configuration including a processing unit having a CPU (Central Processing Unit) and the like, a storage unit such as a RAM (Random Access Memory), and the like, Omitted.
- an engine ECU 30 that controls the operation of the engine 3 and a pre-crash ECU 34 that controls the PCS 22 are provided.
- the engine 3 and the starter 12 are connected to the engine ECU 30.
- the radar 24 and the actuator 26 are connected to the pre-crash ECU 34.
- the engine ECU 30 and the pre-crash ECU 34 are connected to each other so that information and signals can be exchanged.
- the vehicle travel control device 2 is configured as described above, and the operation thereof will be described below.
- the engine ECU 30 controls the operation of the engine 3 based on an accelerator opening that is an operation amount of an accelerator pedal (not shown) operated by the driver.
- the throttle valve (not shown) and the fuel injection amount are adjusted based on the accelerator opening, and in the case of the spark ignition type engine 3, the ignition timing is adjusted. By doing so, the engine ECU 30 causes the engine 3 to generate power according to the accelerator opening.
- the driver switches the gear stage of the transmission 8 and selects an arbitrary gear stage so that the gear ratio of the transmission 8 becomes a gear ratio suitable for the vehicle speed.
- the power generated in the engine 3 in response to the driver's request is transmitted to the transmission 8 via the clutch 6, and after the transmission 8 is shifted at a gear ratio selected by the driver, the drive It is transmitted to the drive wheels via a power transmission path such as a shaft.
- the driving wheel to which the power generated by the engine 3 is transmitted generates a driving force by this power, and the vehicle 1 travels by this driving force.
- the traveling direction is changed when the vehicle 1 is traveling, the traveling direction is changed by a steering driving operation performed by the driver using a steering wheel (not shown). However, when the driver performs a steering operation, this operation is performed.
- the rotational torque is input to the EPS 20.
- the EPS 20 is operated by electricity charged in the battery 16 or electricity generated by the alternator 10, generates assist torque with respect to rotational torque by a driver's steering operation, outputs it to the steered wheel, and steers the direction of the steered wheel. In the direction according to the steering operation of the driver.
- the vehicle 1 has a PCS 22 that is controlled by the pre-crash ECU 34.
- the PCS 22 is always in operation while the vehicle 1 is traveling. The operation of the PCS 22 will be described.
- the radar 24 While the vehicle 1 is traveling, the radar 24 always detects the situation ahead, and the pre-crash ECU 34 acquires the acquired information ahead of the vehicle 1. Whether or not the pre-crash ECU 34 is highly likely to collide with a preceding vehicle or the like based on the acquired information on the situation in front of the vehicle 1 or information on the vehicle speed detected by a vehicle speed sensor (not shown) that detects the vehicle speed. Determine.
- the pre-crash ECU 34 determines the possibility of a collision in this manner and determines that the possibility of a collision with a preceding vehicle or the like is high, the pre-crash ECU 34 controls each actuator that can be controlled by the pre-crash ECU 34. By actuating 26, control for protecting the occupant is performed. For example, a control signal is transmitted to an actuator 26 that can output sound to a speaker (not shown) installed in the vehicle, and an alarm is output from the speaker. Notify that there is a high possibility of
- the actuator 26 that can assist the pedaling force input to the brake pedal is provided. Send a control signal.
- a larger braking force is generated as compared with a normal braking force with respect to the pedaling force during the braking operation.
- the seat belt winding motor provided as the actuator 26 is operated to wind the seat belt.
- crew is closely_contact
- pre-crash safety control which is control of the PCS 22
- the actuator 26 that is electrically operated as described above, the safety in the case where there is a high possibility of collision with the preceding vehicle is improved. .
- the determination as to whether or not the driver intends to accelerate the vehicle 1 in the determination of the free run is made based on, for example, the connection state of the clutch 6 or the selection state of the transmission 8. Specifically, when the clutch 6 is in a disengaged state and the selected state of the transmission 8 is a neutral position in which no gear stage is selected, or when the transmission 8 is in the neutral position, In addition, when the engine speed is equal to or lower than a predetermined speed set in advance, or when the clutch 6 is in a disengaged state and the engine speed is equal to or lower than a predetermined speed, the free run is performed. Is determined to be performed.
- connection state of the clutch 6 in this determination is detected by a clutch sensor (not shown) that detects the operation state of a clutch pedal (not shown) that can be switched between the connection state and the disconnection state of the clutch 6.
- the selection state of the transmission 8 is detected by a shift sensor (not shown) that detects the operation state of a shift lever (not shown) that can select the gear position of the transmission 8.
- the engine ECU 30 stops the operation of the engine 3 by stopping the fuel injection control and the ignition control.
- the transmission 8 is in the neutral position or the clutch 6 is in a disengaged state
- torque transmission between the drive wheels and the engine 3 is interrupted.
- the vehicle 1 does not generate resistance due to the rotation of the engine 3 that does not generate power. Therefore, the vehicle 1 continues coasting by kinetic energy based on the vehicle speed when the free run is started in a state where the traveling resistance is reduced.
- the engine ECU 30 operates the starter 12.
- the starter 12 is operated by electricity charged in the battery 16 and cranks the engine 3.
- the engine ECU 30 starts the engine 3 by supplying fuel to the engine 3 or adjusting the ignition timing while operating the starter 12 to perform cranking in this way.
- the engine 3 When the engine 3 is started when the free run is performed, that is, when the engine 3 is started, the engine 3 is started by operating the starter 12 with the electricity charged in the battery 16 in this way.
- the vehicle 1 is provided with an electric device in addition to the starter 12.
- Such an electric device is operated by electricity supplied from the battery 16 in the same manner as the starter 12 when the engine 3 is stopped. For this reason, when starting the engine 3 at the time of a free run, the electric power which operates the starter 12 and the electric power used with this electric apparatus are needed, and the battery 16 needs to cover all these electric powers. In other words, if the electricity cannot be supplied from the battery 16 at the start of the engine 3 when the free run is being performed, the engine 3 is prohibited from being stopped.
- FIG. 2 is an explanatory diagram of a vehicle speed range in which engine stop permission or stop prohibition is performed.
- a travel state in which the stop of the engine 3 is permitted or prohibited while the vehicle 1 is traveling will be described.
- the engine 3 can be allowed to stop when the total value of the used power including the power for operating the starter 12 is less than the power that can be supplied by the battery 16. Further, when the total value of the power used is larger than the power that can be supplied by the battery 16, the engine 3 is prohibited from being stopped.
- EPS 20 since EPS 20 has a relatively large power consumption, permission to stop the engine 3 based on the power consumption of EPS 20 and the power consumption of starter 12, Alternatively, a prohibited area is set.
- the electric power consumed by the EPS 20, that is, the maximum current for each vehicle speed in the current flowing through the EPS 20 is proportional to the magnitude of the assist torque generated in the EPS 20. Further, the resistance to steering operation during steering is large when the vehicle speed is low and decreases as the vehicle speed increases. Therefore, the assist torque generated in the EPS 20 is large when the vehicle speed is low and decreases as the vehicle speed increases. Become. For this reason, similarly, the maximum current flowing through the EPS 20 increases when the vehicle speed is low, and decreases as the vehicle speed increases.
- the starter 12 when the starter 12 is operated, the current flowing through the starter 12 is constant regardless of the vehicle speed. Therefore, the maximum consumption current Ic that is the sum of the maximum current flowing through the EPS 20 and the current flowing through the starter 12 flows through the EPS 20. Similar to the maximum current, it is high when the vehicle speed is low and decreases as the vehicle speed increases.
- the battery maximum current Id that is the maximum current that can be output from the battery 16 is constant regardless of the vehicle speed, and this battery maximum current Id is the maximum consumption current Ic to start the stopped engine 3. That is the condition.
- the region where the stop of the engine 3 can be permitted is a region where the battery maximum current Id is equal to or greater than the maximum consumption current Ic.
- the maximum consumption current Ic increases as the vehicle speed decreases, the maximum consumption current Ic becomes larger than the battery maximum current Id when the vehicle speed is equal to or lower than the predetermined vehicle speed vt.
- the vehicle speed region below the vehicle speed vt becomes the engine stop prohibition vehicle speed region R1 for prohibiting the stop of the engine 3 with the vehicle speed vt as the boundary, where the magnitude relationship between the maximum consumption current Ic and the battery maximum current Id is switched.
- a vehicle speed range that is higher than the vehicle speed vt is an engine stop permission vehicle speed range R2 that permits the engine 3 to stop.
- the free run is performed when the vehicle speed is within the engine stop permission vehicle speed range R2 and when the free run execution condition is satisfied. Even when the free run execution condition is satisfied, the vehicle speed is within the engine stop prohibition vehicle speed range R1. If this is the case, the engine 3 does not stop and does not perform a free run.
- the battery maximum current Id does not change so much depending on the vehicle speed, but changes depending on the ambient temperature of the battery 16, the state of charge of the battery 16, and the deterioration state of the battery 16.
- the engine ECU 30 detects the current battery maximum current Id from the detection result of the battery state detection device 18 that detects the current flowing from the battery 16, and the engine stop prohibition vehicle speed range R1 or the like according to the detected battery maximum current Id.
- An engine stop permission vehicle speed range R2 is set.
- the engine 3 continues to operate while the vehicle 1 is traveling, so that the alternator 10 can generate power.
- the current that can be supplied to each electric device is the sum of the maximum current that can be generated by the alternator 10 and the battery maximum current Id.
- the alternator 10 since the alternator 10 generates power using the power generated by the engine 3, the power generation amount increases as the power generated by the engine 3 increases, and the power generation amount is higher in the high speed range than in the low speed range of the vehicle speed. It has become.
- the maximum supply current Is which is the sum of the maximum current that can be generated by the alternator 10 and the battery maximum current Id, is greater in the high speed range than in the low speed range of the vehicle speed. Since the maximum supply current Is is larger than the maximum consumption current Ic, the electric device including the EPS 20 operates appropriately in the engine stop prohibition vehicle speed range R1 where the maximum consumption current Ic increases.
- the engine stop prohibition vehicle speed region R1 and the engine stop permission vehicle speed region R2 during normal travel of the vehicle 1 are set based on the relationship between the battery maximum current Id and the maximum consumption current Ic as described above.
- the possible driving range is set by the vehicle speed, but when an obstacle that is highly likely to collide is detected by the PCS 22, the actuator 26 of the PCS 22 is activated. Since this actuator 26 is electrically operated in the same manner as the EPS 20 or the like, current consumption tends to increase. For this reason, when an obstacle is detected by the PCS 22, a stop permission or stop prohibition region of the engine 3 is set in consideration of current consumption in the actuator 26.
- FIG. 3 is an explanatory diagram of a vehicle speed range in which engine stop permission or stop prohibition is possible when there is a possibility of a collision.
- the travel state of permission or prohibition of the stop of the engine 3 when it is determined by the PCS 22 that there is a possibility of collision with an obstacle will be described.
- each actuator included in the PCS 22 based on the detection result of the radar 24. 26 is activated.
- there are a plurality of the actuators 26, and the actuators 26 to be operated differ depending on the high possibility of colliding with an obstacle and the driving operation of the driver.
- the maximum current consumed by the actuator 26 of the PCS 22 is the maximum current consumption Ic.
- the pre-crash maximum consumption current It which is a current obtained by adding a certain pre-crash equipment current Ip, an area for permitting or prohibiting the engine 3 is set.
- the pre-crash maximum current consumption It which is obtained by adding the pre-crash equipment current Ip to the maximum current consumption Ic, is the maximum current consumption.
- the current has the same characteristics as Ic. In other words, the maximum current consumption It at the time of pre-crash is large when the vehicle speed is low, as with the maximum current consumption Ic, and decreases as the vehicle speed increases, while the current value is large in all regions with respect to the maximum current consumption Ic. It has become.
- the battery maximum current Id is It needs to be larger than the maximum current consumption It during pre-crash.
- the stopped engine 3 can be started regardless of the operating state of the actuator 26 of the PCS 22 because the battery maximum current Id is This is a region where the maximum current consumption It during pre-crash is larger.
- the maximum current consumption It and the maximum current consumption Ic at the time of pre-crash both decrease as the vehicle speed increases, and the maximum current consumption It at the time of pre-crash is the whole of the maximum current consumption Ic. In particular, the current value is large. For this reason, the battery maximum current Id and the maximum current consumption It at the time of pre-crash intersect, and the battery speed at which the battery maximum current Id is larger than the maximum current consumption It at pre-crash is greater than the maximum current consumption Ic.
- the vehicle speed is faster than the vehicle speed.
- the vehicle speed vt between the battery maximum current Id and the maximum consumption current Ic is between the vehicle speed vp at which the battery maximum current Id and the pre-crash maximum consumption current It intersect.
- the vehicle speed range is an engine start vehicle speed range R3 that is a vehicle speed range in which the engine 3 needs to be started. That is, the engine start vehicle speed range R3 needs to start the engine 3 before the actuator 26 of the PCS 22 is operated when it is determined that there is a possibility of collision with an obstacle when the engine 3 is stopped. It is a certain vehicle speed range.
- the engine 3 is started.
- the alternator 10 is also operated, and the alternator 10 generates power. Therefore, the current that can be supplied to each electric device is the maximum supply current Is. Therefore, the current that can be supplied to each electric device can be made equal to or greater than the maximum current consumption It during pre-crash, and the actuator 26 of the PCS 22 can be operated by the electricity supplied from the alternator 10 and the battery 16. Can be in a possible state.
- Fig. 4 is a time chart during pre-crash safety control.
- the engine 3 is started in this way.
- the pre-crash safety control when free running is performed in this way will be described in time series.
- the pre-crash ECU 34 When traveling with the engine 3 stopped (S1), if the pre-crash ECU 34 determines from the detection result of the radar 24 that there is a possibility of collision with an obstacle (t1), the pre-crash ECU 34 Outputs an alarm from a speaker installed in the vehicle (S2). This notifies the driver of the danger. Further, when it is determined that there is a possibility of collision with an obstacle in this way, the engine ECU 30 operates the starter 12 and starts cranking of the engine 3 (t2, S3). When the cranking of the engine 3 is performed in this manner, the alternator 10 is also operated, so that power generation by the alternator 10 is started up (S4).
- the driver performs a braking operation to avoid the collision.
- the pre-crash ECU 34 performs brake assist for this braking operation (S5). That is, the pre-crash ECU 34 operates the actuator 26 used for brake assist.
- the current supplied by the alternator 10 and the battery 16 needs to be equal to or greater than the maximum current consumption It at the time of pre-crash, but the engine 3 is cranked to generate power.
- the power generation is not stable during the power generation rising period (S4), and the generated current is unstable or does not reach a predetermined current value.
- the actuator 26 used for the pre-crash safety control is operated reliably, such as when performing brake assist (S5), the power generation start period (S4) in the alternator 10 ends, and power generation in the alternator 10 is ensured. It is necessary to actuate the actuator 26 after it is ready to be operated.
- the alternator 10 has a time interval (dt) including the variation in the power generation rise period between the end of the power generation rise period (S4) by the alternator 10 and the start of operation of the actuator 26. The power generation and the operation of the actuator 26 are controlled.
- the actuator 26 used for pre-crash safety control is also activated.
- the seatbelt winding motor is operated to wind the seatbelt (S6), or the airbag is prepared for operation (S7).
- the operation of the actuator 26 of the PCS 22 is performed. Is predicted, the engine ECU 30 prohibits the engine 3 from stopping and free-running.
- the actuator 26 of the PCS 22 when the engine 3 is stopped and the free run is performed, when the actuator 26 of the PCS 22 is operated, it is necessary to start the engine 3 according to the vehicle speed in order to secure a current for operating the actuator 26. There may be. Specifically, when the vehicle speed during the free run is within the engine start vehicle speed range R3, it is necessary to start the engine 3 before operating the actuator 26. For this reason, in order to suppress starting the engine 3 again after the engine 3 is stopped, when the vehicle 26 is running with the power generated by the engine 3, the actuator 26 of the PCS 22 is activated. In this case, the engine 3 is stopped before the actuator 26 is operated to prohibit free-running.
- the vehicle traveling control device 2 determines that the driver does not intend to accelerate the vehicle 1 while traveling by the power generated by the engine 3, the vehicle traveling control device 2 stops the engine 3 and performs free run. It is carried out. Thereby, the fuel consumption amount at the time of driving
- the free run is performed and the operation of the actuator 26 of the PCS 22 is predicted by detecting an obstacle such as a preceding vehicle by the radar 24, the engine 3 is started and the alternator 10 generates power. As a result, the amount of electricity supplied is increased.
- the engine 3 is started before the actuator 26 operates.
- electricity necessary for the operation of the actuator 26 can be reliably generated by the alternator 10 that generates power by operating with the power of the engine 3 and can be supplied to the actuator 26. Therefore, even when a free run is being performed, even if the situation in which the occupant's protection needs to be improved, a maintenance operation that improves the occupant's protection can be more reliably performed by the actuator 26. As a result, it is possible to more reliably achieve both improvement in fuel efficiency and maintenance operation during vehicle travel.
- the engine 3 when the engine 3 is operated and the vehicle 1 is driven by the power generated by the engine 3, if it can be determined that the driver does not intend to accelerate, the engine 3 is stopped and the free run is performed. If the operation of the actuator 26 of the PCS 22 is predicted, this free run is prohibited. That is, the actuator 26 is operated by electricity, but depending on the driving state of the vehicle 1, it may be difficult to appropriately operate the actuator 26 only by electricity supplied from the battery 16. For this reason, when the operation of the actuator 26 of the PCS 22 is predicted, it is prohibited to stop the engine 3 and the power generation of the engine 3 is continued to generate power in the alternator 10, so that an electric device such as the actuator 26 is provided. Secure the electricity to supply.
- the actuator 26 of the PCS 22 that prioritizes the operation over the free run that can reduce the fuel consumption protects the occupant of the vehicle 1 when the vehicle 1 may collide with an obstacle such as a preceding vehicle. It is provided as an occupant protection device capable of performing For this reason, even when the traveling control for improving the fuel efficiency is performed, the occupant of the vehicle 1 can be appropriately protected. As a result, it is possible to more reliably achieve both improvement in fuel efficiency and maintenance operation during vehicle travel.
- the vehicle travel control device 40 according to the second embodiment has substantially the same configuration as that of the vehicle travel control device 2 according to the first embodiment, except that free run control is performed in consideration of a load during travel of the vehicle 1. There are features. Since other configurations are the same as those of the first embodiment, the description thereof is omitted and the same reference numerals are given.
- FIG. 5 is a schematic diagram of a vehicle including the vehicle travel control device according to the second embodiment.
- the vehicle travel control device 40 according to the second embodiment is provided with the same configuration as the vehicle travel control device 2 according to the first embodiment, and includes an engine 3 as a power source when the vehicle 1 travels.
- the engine 3 is connected to a transmission 8 via a clutch 6. Further, the engine 3 is provided with an alternator 10 that generates electric power by power generated by the engine 3 and a starter 12 that can start the engine 3.
- An engine ECU 30 is connected to the engine 3 provided in this way, and the engine ECU 30 controls the operation of the engine 3 as well as the amount of electricity generated by the alternator 10 and the operation of the starter 12 that starts the engine 3. It is possible to control.
- a battery 16 is provided as a power supply source for supplying electricity to the electric device used in the vehicle 1.
- the battery 16 is charged while charging the electricity generated by the alternator 10. It is provided so that electricity can be supplied to the electric device.
- a battery state detection device 18 that detects the state of the battery 16 is connected to the battery 16 thus provided.
- a plurality of electric load devices 42 which are electric devices that are operated by these electricity are provided in a path through which electricity output from the alternator 10 and the battery 16 flows.
- the electrical load device 42 is provided as a vehicle maintenance device that ensures safety when the vehicle 1 is traveling.
- an electrical load device 42 for example, EPS 20 (see FIG. 1) that operates by electricity, etc.
- These electric load devices 42 apply an electric load to the alternator 10 and the battery 16 that are power supply sources by using electricity when operating or lighting.
- the vehicle travel control device 40 is configured as described above, and the operation thereof will be described below.
- the engine 3 is controlled by the engine ECU 30 in accordance with the accelerator opening, and the engine 3 travels by generating power. If it can be determined that the driver does not intend to accelerate the vehicle 1 while the vehicle 1 is traveling, the engine 3 is stopped and a free run is performed. During the free run, the engine 3 is stopped in this way, but the electric load device 42 operates in the same manner as during normal running even during the free run.
- FIG. 6 is an explanatory diagram showing the relationship between the supply current including the amount of power generated by the alternator and the load current.
- the alternator 10 does not generate power, so it is necessary to cover the load current Ie with the battery maximum current Id. For this reason, when performing a free run, the battery maximum current Id needs to exceed the load current Ie.
- the battery maximum current Id is constant regardless of the vehicle speed, whereas the load current Ie may vary depending on the vehicle speed.
- the EPS 20 motor is included in the electric load device 42, but the EPS 20 consumes a large amount of current when the vehicle speed is low, and the consumption current decreases as the vehicle speed increases. For this reason, the load current Ie is also lower when the vehicle speed is high than when the vehicle speed is high, and when the free run is performed, the load current Ie becomes equal to or higher than the battery maximum current Id due to the decrease in the vehicle speed. There is a case. As described above, when the load current Ie is predicted to be equal to or greater than the battery maximum current Id, the engine ECU 30 controls the starter 12 in order to generate electric power with the alternator 10 and appropriately operate the electric load device 42. Then, the starter 12 is operated to start the engine 3.
- the engine 3 is started when the actual vehicle speed during the free run decreases to the vehicle speed ve that is predicted to cause the load current Ie, which increases as the vehicle speed decreases, to exceed the battery maximum current Id.
- the engine 3 is started before the electric load device 42 operates in a state where the load current Ie is equal to or greater than the battery maximum current Id.
- the rotation of the engine 3 By increasing the number, the power generation amount in the alternator 10 is increased. That is, when the load current Ie becomes larger than the maximum supply current Is in the current operating state, the rotational speed of the engine 3 is increased in order to increase the amount of power generated by the alternator 10.
- FIG. 7 is an explanatory diagram showing the relationship between the rotational speed of the alternator and the current generated by the alternator.
- the relationship between the number of revolutions of the alternator 10 and the amount of power generation will be described.
- the alternator 10 transmits a part of the power generated by the engine 3 as rotational torque, and generates electric power by rotating the rotating body by this rotational torque.
- the amount of power generation increases as the rotational speed of the rotating body increases. That is, the current generated by the alternator 10 increases as the rotation speed of the alternator 10 increases.
- the alternator 10 when the current generated by the alternator 10 is increased, the current generated is increased by increasing the rotational speed Nr of the alternator 10 during normal idle rotation of the engine 3.
- the rotational speed of the alternator 10 when the alternator 10 generates a current higher than the current generated when the alternator 10 rotates at the rotational speed Nr during normal idle rotation of the engine 3, the rotational speed of the alternator 10 is set to the rotational speed. Set higher than Nr.
- the engine 3 is increased in this way, and the amount of power generated by the alternator 10 is increased. Is increased from the alternator 10 and the battery 16, and the maximum current that can be supplied to the electric load device 42 can be increased. In other words, when the load current Ie is larger than the maximum supply current Is, the maximum sum of the current that can be generated by the alternator 10 and the current that can be output from the battery 16 is increased by increasing the amount of power generated by the alternator 10. The supply current Is is increased. As a result, the power generation amount increase supply current Isu, which is the current obtained by increasing the maximum power supply current Is by increasing the power generation amount in the alternator 10, is made larger than the load current Ie.
- the electric load device 42 can cover the load current Ie, which is the maximum current consumption of the electric load device 42, by the power generation amount increase supply current Isu thus increased with respect to the maximum supply current Is, the power generation amount increase. It operates properly with the supply current Isu.
- the load current Ie becomes equal to or greater than the battery maximum current Id, and the electric load device The engine 3 is started before 42 operates.
- the electric load device 42 when the electric load device 42 is operated, the electricity required for the operation of the electric load device 42 is reliably generated by the alternator 10 that generates power by operating the power of the engine 3, and is supplied to the electric load device 42. can do. Therefore, when the electric load device 42 is operated to ensure safety when the vehicle 1 is traveling when performing a free run, the maintenance operation for ensuring safety is more reliably performed on the electric load device 42. Can be done. As a result, it is possible to more reliably achieve both improvement in fuel efficiency and maintenance operation during vehicle travel.
- the engine 3 also includes an alternator 10 that generates electric power when the engine 3 is in operation.
- the electric load device 42 When the electric load device 42 is activated when the load current Ie exceeds the battery maximum current Id, The amount of power generated by the alternator 10 is increased by increasing the number of revolutions. Thereby, the electric current required for operating the electric load device 42 can be supplied to the electric load device 42 more reliably, and the electric load device 42 can be operated appropriately. As a result, it is possible to more reliably achieve both improvement in fuel efficiency and maintenance operation during vehicle travel.
- the actuator 26 of the PCS 22 is used as the vehicle maintenance device, and in the vehicle travel control device 40 according to the second embodiment, the electric load device 42 as the vehicle maintenance device.
- the vehicle maintenance device used for determining whether to execute the traveling control with the engine 3 stopped may be other than these.
- the vehicle maintenance device for example, when the vehicle 1 travels, the vehicle 1 generates braking force independently for each wheel according to the traveling state, or controls the EPS 20 to control the steering assist torque. May be a stable travel control device that prevents the side slip of the vehicle 1 and stabilizes the traveling state when the vehicle 1 is traveling.
- the control for preventing such a side slip is a case where a side slip is detected by a sensor for detecting the motion state of the vehicle 1 or a side slip is predicted from the curvature of the corner obtained from the vehicle speed or the map information of the car navigation system. Further, it is performed by controlling the braking force and the steering assist. In this way, when controlling braking force and steering assist in order to perform control to prevent skidding, the actuator used for those controls is operated, and the actuator is used for a stable travel control device. Although controlled by the ECU, these are operated by electricity. For this reason, when the engine 3 is stopped and the free run is performed, the engine 3 may be stopped or the stop of the engine 3 may be prohibited according to the operating state of the stable travel control device. As a result, it is possible to ensure the stability when the vehicle 1 is traveling while improving the fuel efficiency when the vehicle is traveling.
- the vehicle maintenance device is a purification means heating device such as a heater that is provided in a passage for exhaust gas discharged during operation of the engine 3 and that heats a catalyst (not shown) as purification means for purifying the exhaust gas.
- a purification means heating device such as a heater that is provided in a passage for exhaust gas discharged during operation of the engine 3 and that heats a catalyst (not shown) as purification means for purifying the exhaust gas.
- the catalyst has a temperature range in which the exhaust gas can be efficiently purified, and the efficiency in purifying the exhaust gas is likely to decrease at temperatures below this temperature range. For this reason, when it is detected or estimated that the temperature of the catalyst is lower than this temperature range, the temperature of the catalyst can be raised by the purification means heating device to efficiently purify the exhaust gas. Maintain possible temperature range.
- the purification means heating device can raise the temperature of the catalyst in this way, but the heater or the like provided as the purification means heating device is operated by electricity. For this reason, when the engine 3 is stopped and free run is performed, the engine 3 may be stopped or the stop of the engine 3 may be prohibited according to the operating state of the purification means heating device. As a result, the exhaust gas purification performance can be ensured while improving the fuel efficiency during vehicle travel. Further, when the engine 3 is operated with the temperature of the catalyst being low and prohibiting the stop of the engine 3 when operating the purification means heating device, the temperature of the catalyst is also increased by the exhaust gas discharged from the engine 3. Can be made. As a result, the temperature of the catalyst can be quickly raised by the heat generated by the purification means heating device and the heat of the exhaust gas, and the purification performance of the exhaust gas lowered by the decrease in the temperature of the catalyst can be further improved. It can recover early.
- the free run is used as the travel control in which the engine 3 is stopped and the inertial travel is performed when the vehicle 1 travels.
- the travel control in which the engine 3 is stopped and travels by inertia when the vehicle 1 is traveling may be other than free-run.
- the control described above may be performed when the engine 3 is stopped during deceleration and the vehicle 1 travels inertially.
- the vehicle speed decreases more rapidly than during free-running. Therefore, when the engine 3 is stopped, the vehicle speed is such that the maximum current consumption It and load current Ie during pre-crash are larger than the battery maximum current Id. It becomes easy to become below.
- the transmission 8 has a plurality of gear stages having different gear ratios, and the driver manually selects an arbitrary gear stage.
- the transmission 8 may be an automatic transmission.
- a stepped automatic transmission that switches the gear ratio by using planetary gears and a clutch, or a continuously variable transmission that can switch the gear ratio steplessly by using a belt and a pulley, etc. May be.
- the transmission 8 is an automatic transmission
- the transmission of torque can be interrupted between the engine 3 and the drive wheels. Therefore, the engine 3 can be stopped and the vehicle 1 can travel with inertia. it can.
- the driving range can be arbitrarily switched by the driver, and the driving range is the range in which the power generated by the engine 3 is not transmitted to the driving wheels while the vehicle 1 is traveling.
- the driver can determine that there is no intention to accelerate the vehicle 1. For this reason, even when the transmission 8 is an automatic transmission such as a continuously variable transmission, coasting is performed as necessary, and the maximum current consumption It and load current Ie during pre-crash are larger than the battery maximum current Id.
- the vehicle travel control device is useful for a vehicle including an electric device that operates using electricity generated by a power generation device using power generated by a power source, and in particular, stops the power source. It is suitable for the control that runs with inertia.
Abstract
Description
図1は、実施形態1に係る車両走行制御装置を備える車両の概略図である。同図に示し、本実施形態1に係る車両走行制御装置2を備える車両1は、走行時における動力源として内燃機関であるエンジン3が設けられており、エンジン3は、クラッチ6を介して有段式の変速機8に連結されている。この変速機8は、ドライブシャフト(図示省略)等の動力伝達経路を介して駆動輪(図示省略)に連結されている。
実施形態2に係る車両走行制御装置40は、実施形態1に係る車両走行制御装置2と略同様の構成であるが、車両1の走行時における負荷を考慮してフリーランの制御を行う点に特徴がある。他の構成は実施形態1と同様なので、その説明を省略すると共に、同一の符号を付す。
2、40 車両走行制御装置
3 エンジン
6 クラッチ
8 変速機
10 オルタネータ
12 スタータ
16 バッテリ
18 バッテリ状態検出装置
20 EPS
22 プリクラッシュセーフティシステム
24 レーダ
26 アクチュエータ
30 エンジンECU
34 プリクラッシュECU
42 電気負荷機器
Claims (8)
- 動力源で発生する動力によって走行する車両を、前記動力源を停止させて惰性で走行させている場合に、車両保全装置の作動が予測される場合には、前記動力源を起動することを特徴とする車両走行制御装置。
- 動力源で発生する動力によって走行する車両の走行中に、車両保全装置の作動が予測される場合には、前記動力源を停止させて惰性で走行することを禁止することを特徴とする車両走行制御装置。
- 動力源で発生する動力によって走行する車両を、前記動力源を停止させて惰性で走行させている場合に車両保全装置が作動する場合には、前記車両保全装置が作動する前に前記動力源を起動することを特徴とする車両走行制御装置。
- 動力源で発生する動力によって走行する車両の走行中に車両保全装置が作動する場合には、前記車両保全装置が作動する前に前記動力源を停止させて惰性で走行することを禁止することを特徴とする車両走行制御装置。
- 前記動力源は、前記動力源の運転時に発電をする発電装置を備えており、
前記車両保全装置の作動時に前記動力源を起動する場合には、前記動力源の回転数を上昇させることにより前記発電装置での発電量を増加する請求項1または3に記載の車両走行制御装置。 - 前記車両保全装置は、前記車両が障害物に衝突する可能性がある場合に前記車両の乗員の保護を行うことのできる乗員保護装置である請求項1~5のいずれか1項に記載の車両走行制御装置。
- 前記車両保全装置は、前記車両の走行時における走行状態を安定させる安定走行制御装置である請求項1~5のいずれか1項に記載の車両走行制御装置。
- 前記車両保全装置は、前記動力源の運転時に排出する排気ガスを浄化する浄化手段を加熱する浄化手段加熱装置である請求項1または3に記載の車両走行制御装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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CN2010800691067A CN103154475A (zh) | 2010-09-14 | 2010-09-14 | 车辆行驶控制装置 |
JP2012533772A JP5413518B2 (ja) | 2010-09-14 | 2010-09-14 | 車両走行制御装置 |
PCT/JP2010/065816 WO2012035614A1 (ja) | 2010-09-14 | 2010-09-14 | 車両走行制御装置 |
US13/821,828 US9157386B2 (en) | 2010-09-14 | 2010-09-14 | Vehicle travel control device |
EP10857248.8A EP2617971A1 (en) | 2010-09-14 | 2010-09-14 | Vehicle travel control device |
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PCT/JP2010/065816 WO2012035614A1 (ja) | 2010-09-14 | 2010-09-14 | 車両走行制御装置 |
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WO2012035614A1 true WO2012035614A1 (ja) | 2012-03-22 |
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PCT/JP2010/065816 WO2012035614A1 (ja) | 2010-09-14 | 2010-09-14 | 車両走行制御装置 |
Country Status (5)
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US (1) | US9157386B2 (ja) |
EP (1) | EP2617971A1 (ja) |
JP (1) | JP5413518B2 (ja) |
CN (1) | CN103154475A (ja) |
WO (1) | WO2012035614A1 (ja) |
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JP2014092102A (ja) * | 2012-11-05 | 2014-05-19 | Toyota Motor Corp | 車両の走行制御装置 |
JP2017014964A (ja) * | 2015-06-30 | 2017-01-19 | 日産自動車株式会社 | 惰性走行制御方法及び惰性走行制御装置 |
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US9719477B2 (en) * | 2013-12-09 | 2017-08-01 | Textron Inc. | Using a DC or AC generator as a starter with fault detection |
JP6298008B2 (ja) | 2015-04-24 | 2018-03-20 | トヨタ自動車株式会社 | 車両用エンジン始動制御システム |
KR101693991B1 (ko) * | 2015-05-18 | 2017-01-17 | 현대자동차주식회사 | 친환경 차량의 제어 시스템 및 방법 |
DE102016208217B4 (de) * | 2015-05-22 | 2022-04-21 | Ford Global Technologies, Llc | Verfahren und Vorrichtung zum Betrieb eines zu autonomen Fahren fähigen Fahrzeugs |
DE102016201805A1 (de) * | 2016-02-05 | 2017-08-10 | Robert Bosch Gmbh | Verfahren und Steuergerät zum Einstellen eines Ansteuersignals zum Ansteuern mindestens einer Sicherheitseinrichtung eines Fahrzeugs |
WO2020128066A1 (en) * | 2018-12-20 | 2020-06-25 | Volvo Truck Corporation | Improved method for controlling an energy storage system |
CN110276525B (zh) * | 2019-05-27 | 2021-06-22 | 北京交通大学 | 基于燃油经济性的发动机关键技术评估方法 |
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Also Published As
Publication number | Publication date |
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JPWO2012035614A1 (ja) | 2014-01-20 |
EP2617971A1 (en) | 2013-07-24 |
CN103154475A (zh) | 2013-06-12 |
JP5413518B2 (ja) | 2014-02-12 |
US20130166153A1 (en) | 2013-06-27 |
US9157386B2 (en) | 2015-10-13 |
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