JP2014202191A - Mounting vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting vehicle which suppresses power fluctuation of an engine for travelling, thereby, improves drivability and suppresses fuel consumption.SOLUTION: A mounting vehicle includes an engine 10, an engine control means 11, a power generator 13 which supplies generation power to a power unit 3 and a power generator control means 17 which controls the power generator 13. The engine control means 11 outputs a predetermined torque to the engine when a driver request torque based on an accelerator pedal 2 stroke is less than the predetermined torque of a high output efficiency and, when the driver request torque is the predetermined torque or more, outputs the driver request torque. When the driver request torque is less than the predetermined torque, the power generator control means 17 generates a difference between the predetermined torque and the driver request torque as the power generation torque and, when the driver request torque is the predetermined torque or more, the power generation control means 17 generates no power. A battery 22 which charges excessive generated power and supplies the charged power to the power unit 3 is provided.

Description

  In the present invention, for example, a freezer equipped with a freezer, a garbage collection vehicle equipped with a dust throwing device such as garbage, a concrete mixer equipped with a mixer drum, and the like require power for the bodywork during traveling. It relates to bodywork vehicles.

  Conventionally, for example, a bodywork vehicle such as a freezer car equipped with a freezer as a bodywork is used for low-temperature transportation of fresh food and the like. As such a refrigeration vehicle, a generator is driven by a traveling engine, the generated power is supplied to an inverter, and a compressor (compressor motor) that is a power unit is operated by the output of the inverter. Has been proposed.

  As described above, a body-mounted vehicle equipped with a generator has a characteristic that the generated power changes according to the engine speed. For this reason, when the compressor, which is a power unit, is operating at a high capacity while the engine speed is high, if the engine speed drops rapidly to a low range, the generated power will drop sharply and the compressor will be excessive. It becomes a load operation and breaks down and stops. If this happens, there is a problem that cooling of the refrigerator compartment is interrupted.

  In order to eliminate this point, a device is proposed that includes a control means that reduces the output frequency of the inverter to a predetermined value when the acceleration of the change when the engine speed changes in the decreasing direction is equal to or greater than a set value. (For example, refer to Patent Document 1). In this device, by reducing the output frequency of the inverter, it is possible to avoid unnecessary stop of the compressor as the power unit and continue cooling in the freezer even when the engine speed drops rapidly. Yes.

JP 2001-56162 A

  However, as shown in FIG. 5, when the generator is driven by the power of the engine while traveling and the power for driving the power device of the bodywork is taken out, as shown by the solid line, the amount of depression of the accelerator pedal Even if the engine outputs the driver request torque based on the engine torque, the generator torque shown by the dotted line is consumed by the generator from the engine torque, and the actual running torque for running the bodywork vehicle decreases as shown by the one-dot chain line . This means that the bodywork vehicle cannot be driven according to the driver's required torque based on the amount of depression of the accelerator pedal, and the driver needs to depress the accelerator pedal deeper in order to drive the bodywork vehicle at the desired speed. Give rise to

  On the other hand, if the freezer is sufficiently cooled, the power unit stops and power generation by the generator stops. When power generation by the generator stops during traveling, the power generation torque consumed from the engine torque becomes zero, and the actual traveling torque for traveling the bodywork vehicle is the engine torque indicated by the solid line in FIG. For this reason, even if the amount of depression of the accelerator pedal is constant, the power for driving the vehicle fluctuates depending on the presence or absence of the power generation torque, and the drivability of the vehicle (so-called dubability) decreases.

  Further, from the viewpoint of energy saving in recent years, it is also required to suppress the fuel consumption as much as possible.

  An object of the present invention is to provide a bodywork vehicle that can prevent a decrease in power for running a vehicle, suppress fluctuations in the power to improve dubability, and suppress fuel consumption. .

  The present invention provides an engine, an engine control unit that controls the engine, a generator that is driven by the engine to supply generated power to a power unit, and a bodywork vehicle that includes a generator control unit that controls the generator. It is an improvement.

  The characteristic structure is that the engine control means causes the engine to output a predetermined torque if the driver required torque based on the amount of depression of the accelerator pedal is less than a predetermined torque with high engine output efficiency, and the driver required torque If the torque is equal to or greater than the torque, the engine is configured to output the driver required torque. The generator control means generates the difference between the predetermined torque and the driver required torque as the generated torque when the driver required torque is less than the predetermined torque. If the driver request torque is greater than or equal to the predetermined torque, the generator is configured to stop the power generation, and the power generated by the generator is charged by surplus generated power from the generator not used by the power unit. There is a battery provided to supply charging power to the power unit when the power is insufficient.

  In the bodywork vehicle of the present invention, a battery capable of charging the power generated from the generator and supplying the power to the power unit is provided. Can be driven.

  In addition, when the driver request torque is less than the predetermined torque, the generator can generate power using the difference between the predetermined torque and the driver request torque as a power generation torque, so that the engine can be driven with the predetermined torque. For this reason, the engine that drives the generator to generate the electric power charged in the battery is driven at a predetermined torque, so that the engine can be operated efficiently and the fuel consumption can be suppressed more than in the past. It becomes possible.

  Since the engine outputs a torque obtained by adding the power generation torque to the driver required torque, even if the generator is driven by the power of the engine while traveling, the bodywork vehicle is sufficiently driven by the power excluding the power that drives the generator. Can be run. As described above, the engine outputs the torque obtained by adding the power generation torque, so that the power for driving the vehicle does not fluctuate. As a result, the drivability of the vehicle (so-called dubability) does not deteriorate.

  On the other hand, if the driver request torque is equal to or greater than the predetermined torque, the power generation by the generator is stopped, so the power generation torque becomes zero, and the same torque as the driver request torque can be generated by the engine to run the bodywork vehicle. . As a result, it is possible to prevent a decrease in power for running the vehicle. In this case, power generation by the generator is eliminated, but the power unit can be driven by the electric power charged in the battery.

It is a block block diagram which shows the bodywork vehicle which drive | works while charging a battery and driving a power unit in embodiment of this invention. It is a block block diagram corresponding to FIG. 1 which shows the bodywork vehicle which drive | works while driving a power unit with the electric power generation by the generator. It is a block block diagram corresponding to FIG. 1 which shows the bodywork vehicle which drive | works while driving a power unit with the electric power of a battery, without generating electric power with the generator. It is a figure which shows the relationship between the engine torque, driver request torque, and electric power generation torque. It is a figure corresponding to FIG. 4 which shows the relationship between the engine torque in the conventional bodywork vehicle, a driver request torque, and a power generation torque.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  1 to 3 are block diagrams showing examples of the configuration of the bodywork vehicle 1 of the present invention. The bodywork vehicle 1 includes an engine 10 (Electronic Control Unit) that is an engine control unit that controls the engine 10 according to a driver request torque that is obtained from a depression amount of an accelerator pedal 2 and an engine 10 that generates power for traveling the vehicle. 11, a generator 13 driven by the engine 10, an inverter 14 for supplying the power generated from the generator 13 to the power unit 3, and a generator control means for controlling the generator 13 via the inverter 14 And a generator ECU 17. The generator 13 is connected to the engine 10, and a transmission 16 is further connected to the generator 13 via the clutch 12.

  The engine 10 is an example of an internal combustion engine, and is controlled by the engine ECU 11 to rotate gasoline by rotating inside a gasoline, light oil, CNG (Compressed Natural Gas), LPG (Liquefied Petroleum Gas), or alternative fuel. Power is generated, and the generated power is transmitted to the clutch 12 via the generator 13. In the figure, the engine 10 is a diesel engine using light oil as a fuel, and reference numeral 10a indicates a fuel injection device 10a that injects light oil that is the fuel.

  The engine ECU 11 that controls the engine 10 is configured by, for example, a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), a microprocessor (microcomputer), a DSP (Digital Signal Processor), and the like, and includes an arithmetic unit therein. , A memory, and an I / O (Input / Output) port. The engine ECU 11 is connected to a detection output of an accelerator sensor 4 that detects the amount of depression of the accelerator pedal 2, and the control output of the engine ECU 11 is connected to a fuel injection device 10 a of the engine 10. The engine ECU 11 is configured to operate in cooperation with the generator ECU 17 according to the driver request torque required from the depression amount of the accelerator pedal 2, and to control the engine 10 such as the fuel injection amount and the valve timing.

  The generator 13 is a so-called motor generator, which generates power by the power from the engine 10 and supplies the electric power to the inverter 14. However, the generator 13 in this embodiment is configured to be able to generate power even by power that rotates the shaft supplied from the transmission 16 via the clutch 12.

  The clutch 12 transmits the shaft output from the engine 10 to the transmission 16 via the generator 13. The clutch 12 shown in the figure exemplifies one that is mechanically controlled according to the hydraulic pressure controlled by the clutch actuator 21. The clutch actuator 21 is controlled by an electric signal from a clutch ECU (not shown).

  The transmission 16 is configured to shift the rotational power from the engine 10 and transmit it to the drive shaft 19 and rotate the wheels 20 by the rotation of the drive shaft 19 to cause the vehicle 10 to travel.

  The inverter 14 is controlled by the generator ECU 17, converts AC power from the generator 13 into DC power, and supplies it to the power unit 3. That is, when the generator 13 driven by the engine 10 generates power, the inverter 14 is configured to convert the AC power from the generator 13 into DC power and supply it to the power unit 3. Here, the power unit 3 is for generating power of a bodywork (not shown). For example, in a refrigerator vehicle in which the bodywork is a freezer, a compressor (compressor motor) that compresses and circulates refrigerant. It is a drive motor that drives the dust input device in the garbage collection vehicle where the bodywork is a dust input device such as garbage. In the concrete mixer vehicle where the bodywork is a mixer drum, the mixer drum is rotated. This is a rotating motor.

  The generator ECU 17 is a computer that operates in cooperation with the engine ECU 11, and is configured to control the generator 13 by controlling the inverter 14. The generator ECU 17 includes, for example, a CPU, an ASIC, a microprocessor (microcomputer), a DSP, and the like, and includes an arithmetic unit, a memory, an I / O port, and the like. The engine ECU 11 and the generator ECU 17 are connected to each other by a bus that complies with a standard such as CAN (Control Area Network) together with another control ECU (not shown).

  The engine ECU 11 that is an engine control means acquires the accelerator opening information, the vehicle speed information, the gear position information acquired from the transmission 16, etc., refers to these, controls the engine 10, and travels the bodywork vehicle 1. Let As shown in FIG. 3, the specific traveling state includes a non-power generation traveling in which the bodywork vehicle 1 travels without generating power by the generator 13, and an electric power generation by the engine 10 as illustrated in FIGS. 1 and 2. The power generation travel is performed in which the bodywork vehicle 1 travels while driving the machine 13 to generate power.

  In this embodiment, the generator ECU 17 as the generator control means is provided with a memory 17a, and a predetermined torque with high output efficiency of the engine 10 is stored in the memory 17a. Then, as shown in FIG. 4, the engine ECU 11, which is an engine control unit, applies a predetermined torque to the engine 10 when the driver required torque based on the depression amount of the accelerator pedal 2 is less than the predetermined torque with high output efficiency of the engine 10. And when the driver required torque is equal to or greater than the predetermined torque, the engine 10 is configured to output the driver required torque. Here, the predetermined torque with high output efficiency of the engine 10 indicates a torque value with the smallest fuel consumption per unit output in this embodiment.

  On the other hand, if the driver required torque is less than the predetermined torque, the generator ECU 17 that is the generator control means performs power generation by the generator 13 using the difference between the predetermined torque and the driver required torque as the generated torque, and the driver required torque. Is configured to stop power generation by the generator 13 when the torque is equal to or greater than a predetermined torque. Specifically, when the driver request torque is less than the predetermined torque, the generator ECU 17 serving as the generator control means uses the difference between the predetermined torque described in the efficiency map and the driver request torque as the generator torque. 13 is controlled to generate power. On the other hand, when the driver request torque is equal to or greater than the predetermined torque, the power generation torque is set to zero and power generation by the generator 13 is not performed.

  A battery 22 is provided for charging surplus generated power from the generator 13 not used by the power unit 3 and supplying the power to the power unit 3 when the generated power from the generator 13 is insufficient. The battery 22 is a chargeable / dischargeable secondary battery, and is connected to the inverter 14 via the switchboard 23. Then, as shown in FIG. 3, the battery 22 supplies charging power to the power unit 3 via the switchboard 23 when the generator 13 is not generating power, or generates power as shown in FIG. When the machine 13 is generating power, it is charged by the power generated by the generator 13.

  Next, the operation of the bodywork vehicle configured as described above will be described.

  The bodywork vehicle 1 is one in which the bodywork needs power during traveling. For example, in a freezer vehicle that includes a freezer as a bodywork and is used for low-temperature transportation of fresh food or the like, FIG. As shown, the generator 13 is driven by the traveling engine 10, the generated power is supplied to the inverter 14, and the compressor (compressor motor) that is the power unit 3 is operated by the output from the inverter 14.

  Here, in the bodywork vehicle 1 of the present invention, the battery 22 that can charge the generated power from the generator 13 and supply the charging power to the power unit 3 is provided. As shown in FIG. In the case where 13 is generating more power than driving the power unit 3, the surplus power can be charged to the battery 22. Thus, even if the generator 13 stops generating power, as shown in FIG. 3, the power unit 3 can be driven by the battery 22, so the driving of the power unit 3 in a state where the generator 13 stops generating power. Can be secured. And when the battery 22 is fully charged, the compressor which is the motive power apparatus 3 is driven by the output of the battery 22 and the bodywork vehicle 11 is caused to travel without generating power by the generator 13. It is possible to run.

  In this embodiment, a predetermined torque with high output efficiency of the engine 10 is stored in the memory 17a of the generator ECU 17 that is the generator control means, and the engine ECU 11 that is the engine control means and the generator ECU 17 that is the generator control means. Determines whether the driver request torque based on the depression amount of the accelerator pedal 2 is less than a predetermined torque. If the driver request torque is less than the predetermined torque, the engine ECU 11 causes the engine 10 to output the predetermined torque, and the generator ECU 17 causes the generator 13 to generate power using the difference between the predetermined torque and the driver request torque as the power generation torque. .

  That is, the generator ECU 17 generates power using the difference between the predetermined torque and the driver request torque as the power generation torque, and the engine ECU 11 controls the engine 10 to output a torque obtained by adding the notified power generation torque to the driver request torque. To do. In this case, since the sum of the power generation torque and the driver request torque is a predetermined torque, the engine 10 is controlled to output the predetermined torque as shown by the solid line in FIG. Then, the generator 13 is driven by the power generation torque shown by the dotted line in FIG. 4 to generate power, and as shown in FIG. 1, the power unit 3 is driven by the power and the battery 22 is charged with surplus power. Become. Here, since the predetermined torque is the torque with the smallest fuel consumption per unit output, the battery 22 can be charged with the fuel consumption suppressed.

  On the other hand, as a result of the engine ECU 11 being the engine control means and the generator ECU 17 being the generator control means determining whether or not the driver request torque based on the depression amount of the accelerator pedal 2 is less than the predetermined torque, the driver request torque Is equal to or greater than a predetermined torque, the engine ECU 11 causes the engine 10 to output a driver request torque, and the generator ECU 17 sets the power generation torque to zero and does not generate power by the power generator 13. Then, the driver request torque and the traveling torque that actually causes the bodywork vehicle 1 to travel coincide with each other, and the drivability of the vehicle (so-called “dubabiability”) decreases due to the mismatch. There is no.

  When the driver request torque is equal to or greater than the predetermined torque, the generator ECU 17 serving as the generator control means stops the power generation by the generator 13, and therefore, as shown in FIG. This is a non-power generation travel in which the compressor 11 is driven and the bodywork vehicle 11 travels without generating power by the generator 13. As a result, a torque far from a predetermined torque including the power generation torque is output to the engine 10 to prevent power generation by the generator 13, and power generation in a state where the fuel consumption per unit output is relatively large is performed. Can be banned.

  In particular, since the wheel 20 is connected to the generator 13 via the clutch 12, the clutch 12 is connected at the time of deceleration, and the generator 13 is driven by the rotating wheel 20 to generate electric power. By charging 22, the frequency of power generation by driving the generator 13 by the engine 10 can also be reduced. Thus, if the frequency with which the generator 13 is driven by the engine 10 is reduced, the amount of fuel consumed for power generation can be further suppressed.

  In the above-described embodiment, the case where the predetermined torque is stored in the memory 17a provided in the generator ECU 17 has been described. However, the engine ECU 11 that is an engine control unit and the generator ECU 17 that is a generator control unit include As long as the driver required torque and the predetermined torque that can drive the engine at high output can be compared, this predetermined torque may be stored in the memory of the engine ECU 11 or stored in the memory of another ECU. May be.

DESCRIPTION OF SYMBOLS 1 Bodywork vehicle 2 Accelerator pedal 3 Power unit 10 Engine 11 Engine ECU (engine control means)
13 generator 17 generator ECU (generator control means)
22 battery

Claims (1)

An engine (10), engine control means (11) for controlling the engine (10), a generator (13) that is driven by the engine (10) and supplies generated power to a power unit (3), and In the bodywork vehicle having the generator control means (17) for controlling the generator (13),
The engine control means (11) provides the predetermined torque to the engine (10) when a driver request torque based on a depression amount of the accelerator pedal (2) is less than a predetermined torque with high output efficiency of the engine (10). And when the driver request torque is equal to or greater than the predetermined torque, the engine (10) is configured to output the driver request torque,
The generator control means (17) performs power generation by the generator (13) using the difference between the predetermined torque and the driver required torque as a power generation torque when the driver required torque is less than the predetermined torque, The driver request torque is configured to stop power generation by the generator (13) when the predetermined torque is equal to or greater than the predetermined torque,
Charging surplus generated power from the generator (13) not used by the power unit (3) and supplying charging power to the power unit (3) when the generated power from the generator (13) is insufficient A vehicle equipped with a battery (22).

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