JP2794690B2 - Bus vehicle air conditioning control system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle air conditioning control system, and more particularly to an air conditioning control system suitable for controlling air conditioning in a passenger compartment of a bus vehicle. [Prior Art] Conventionally, in this type of air-conditioning control system for a bus vehicle, for example, as disclosed in Japanese Patent Application Laid-Open No. 59-164221, a vehicle is controlled by starting an auxiliary engine which is a diesel engine. There is an air conditioner for controlling indoor air conditioning. [Problems to be Solved by the Invention] However, in the above-described conventional device, when the lamp is turned on by the completion of the preheating of the preheating plug of the auxiliary engine, the driver manually operates the auxiliary engine after confirming that the lamp is lit. Therefore, when starting the auxiliary engine, there is a disadvantage that the driver has to wait for the lighting of the lamp. Further, in the conventional apparatus, for example, in winter, the auxiliary engine is first preheated by a low plug and then started by a starter motor. When the air conditioning load (cooling load) is large after the start of the auxiliary engine, the rotation speed adjusting member according to the present invention is controlled to increase the rotation speed of the auxiliary engine (the rotation speed of the compressor). The rotation speed adjusting member is driven by an electric driving means such as a step motor. Then, when the auxiliary engine is stopped, the rotation speed adjusting member is set to the position at the time of stopping the auxiliary engine by the stepping motor, initialized, and then automatically returned to the auxiliary engine start operation position. In addition, air conditioning control systems for bus vehicles generally allow power supply to all on-board equipment, including air conditioning equipment, to prevent running out of batteries and fires (on and off).
Power switch (main switch in the present invention) is required. Therefore, the present inventors have found that the following problems occur when the above-mentioned power switch is provided in the bus vehicle air conditioning control system described above. That is, if the power switch is turned off immediately after the auxiliary engine is stopped as described above, the rotation speed adjusting member stops at a position different from the start position of the auxiliary engine, and as a result, the auxiliary engine is restarted. When launching,
It was found that a problem of poor startability occurred. Accordingly, it is an object of the present invention to automatically preheat the auxiliary engine with one switch and then smoothly start the auxiliary engine with a starter motor. [Means for Solving the Problems] In order to achieve the above object, a structural feature of the present invention is to control the rotational speed of an auxiliary engine (10) mounted on a bus vehicle and composed of a diesel engine. In a bus vehicle air-conditioning control system that adjusts cooling capacity and controls cooling of the cabin of a bus vehicle, a rotation speed adjusting member (11) that adjusts a rotation speed of the auxiliary engine (10) according to a position; Electric driving means (20, 21, 22, 23) for electrically adjusting the position of the rotation speed adjusting member (11) supplied with electric power from a vehicle-mounted power supply (B) of the vehicle; ) From the electric drive means (20, 2
A main switch (31) for permitting the supply of electric power to the air-conditioning electric equipment including the auxiliary engine (10), a starter motor (MS) for starting the auxiliary engine (10), and a preheating of the auxiliary engine (10). Preheating means to be performed (Pg)
An operation means (32) operated when starting cooling in the vehicle cabin; and a power supply to the air-conditioning electric device is permitted by the main switch (31). ) An output signal generating means (38) for generating an output signal by the operation of; and, based on the output signal generated by the output signal generating means (38), preheating the auxiliary engine (10) by the preheating means (Pg). A first control means (41) for starting the auxiliary engine (1) by the first control means (41).
During the preheating of (0), the second control means (42) for adjusting the position of the rotation speed adjusting member (11) to the start position of the auxiliary engine (10) by the electric drive means (20, 22, 23). A third control means for driving the starter motor (MS) after the rotation speed adjusting member (11) is adjusted to a start position of the auxiliary engine (10) by the second control means (42). (43). [Operation and Effect] With the above-described configuration, as shown in FIG. 1 schematically showing these relationships, the main switch (31)
When the operating means (32) is operated while the power supply to the air conditioning electric device is permitted, the output signal generating means (38) generates an output signal. Then, based on this output signal, the first control means (41) starts preheating the auxiliary engine (10) by the preheating means (Pg). Further, based on the output signal, the second control means (4
2) is an auxiliary engine (1) provided by the first control means (41).
During the preheating of (0), the position of the rotation speed adjusting member (11) is adjusted by the electric drive means (20, 22, 23) to the auxiliary engine (1).
Adjust to the starting position of 0). Thereafter, based on the output signal, the third control means (43)
After the rotation speed adjusting member (11) is adjusted to the start position of the auxiliary engine (10) by the second control means (42), the starter motor (2) is driven. As a result, immediately after the auxiliary engine is stopped, the power supply from the main switch to the electric drive unit is stopped, and even if the position of the rotation speed adjusting member shifts, only the operation unit is operated when the auxiliary engine is restarted. Then, the auxiliary engine is automatically preheated, and during this preheating, the rotation speed adjusting member is adjusted to the auxiliary engine starting position by the electric drive means, so that the auxiliary engine can be started smoothly and easily. [Embodiment] An embodiment of the present invention will be described below with reference to the drawings. FIGS. 2 and 3 show an example of an air conditioning control system for a bus vehicle according to the present invention. This air conditioning control system
The vehicle has an auxiliary engine 10 composed of a diesel engine and a drive mechanism 20. The auxiliary engine 10 receives fuel from a fuel injection pump (attached to the auxiliary engine 10) in accordance with the rotation of the rotation speed control lever 11. And rotate. In this case, as shown in FIG.
When in the second, third, and fourth rotational positions A, B, C, and D, the auxiliary engine 10 corresponds to a stopped state, a low-speed rotation state, a medium-speed rotation state, and a high-speed rotation state, respectively. The auxiliary engine 10
When the air conditioner is in a stopped state, a low-speed rotation state, a medium-speed rotation state, and a high-speed rotation state, the air-conditioning control system corresponds to a cooling stop state, a minimum cooling capacity state, an intermediate cooling capacity state, and a maximum cooling capacity state, respectively. The driving mechanism 20 is a stepping motor 21 (see FIG. 3)
In response to the forward rotation (or reverse rotation), the plunger 22 is displaced leftward (or rightward) in FIG. 2 to displace the connecting rod 23 in the same direction. The connecting rod 23 is connected to an intermediate portion of the rotation speed control lever 11 by a universal joint 23a. The connecting rod 23 moves the rotation speed lever 11 from the first rotation position A to the fourth rotation position D (or from the fourth rotation position D to the first rotation position D) in accordance with its leftward (or rightward) displacement. It is rotated towards a pivot position A). In FIG. 2, reference numerals 12, 12 indicate stoppers of the rotation speed control lever 11, and a universal joint 23b connects the connecting rod 23 to the plunger 22. Further, the above-mentioned 20 to 23 constitute the electric driving means of the present invention. The air-conditioning control system includes a main operation switch 31, a main relay Rm, a control switch 32, and each relay R1.
To R4. As is clear from FIG. 3, the main operation switch 31 allows power supply from a DC power supply B (battery) to an air conditioning control system or the like, which is an electric device for air conditioning. The main operation switch 31 allows power supply from the DC power supply B to the electromagnetic coil Rma of the main relay Rm when closed. The main relay Rm closes (or opens) the normally open switch Rmb by exciting (or demagnetizing) the electromagnetic coil Rma. The control switch 32 turns on the movable contact 32a to the fixed contact 32b, the fixed contact 32c, and the fixed contact 32d, and the first, second, and third necessary for the weak cooling operation, the automatic operation, and the operation stop of the air conditioning control system. Respectively. The relay R1 closes (or opens) the normally open switch R1b by exciting (or demagnetizing) the electromagnetic coil R1a. The relay R2 closes (or opens) the normally open switch R2b by excitation (or demagnetization) of the electromagnetic coil R2a, and connects to the starter motor MS (corresponding to 4 in FIG. 1) attached to the auxiliary engine 10. The power supply from the DC power supply B is allowed (or cut off). The relay R3 closes (or opens) the normally open switch R3b by excitation (or demagnetization) of the electromagnetic coil R3a, and allows power supply from the DC power supply B to the glow plug Pg of the auxiliary engine 10 (or Cut off. The normally open switch R is activated by the excitation (or demagnetization) of the electromagnetic coil R4a.
Close (or open) 4b and switch R1b to the coil CL of the electromagnetic clutch attached to the compressor of the air conditioning control system.
(Or cut off) the power supply from the DC power supply B via the. The electromagnetic clutch is disengaged (or engaged) by the excitation (or demagnetization) of the coil CL and the auxiliary engine 10
Then, the connection with the compressor of the well-known refrigeration cycle is cut off (or allowed). Further, Japanese Patent Application Laid-Open No. 59-164221 described above
As apparent from the publication, by adjusting the rotation speed of the auxiliary engine 10, the rotation speed of the compressor is adjusted. Further, the air conditioning control system includes a rotation speed sensor 33, a normally closed hydraulic switch 34, a temperature setting device 35, and an internal air temperature sensor.
36, an outside air temperature sensor 37, and a microcomputer 38. The rotation speed sensor 33 detects the rotation speed Ne of the auxiliary engine 10 and generates a series of pulse signals proportional to the detection result. The hydraulic switch 34 is opened when the hydraulic pressure in the lubrication system of the auxiliary engine 10 is equal to or higher than a predetermined hydraulic pressure, and generates a pressure detection signal. In this case, the pressure detection signal is generated by the auxiliary engine
Represents 10 stable rotation states. The temperature setter 35 sets a desired temperature inside the cabin of the bus vehicle, the inside air temperature sensor 36 detects the actual temperature inside the cabin, and the outside air temperature sensor 37 outputs the actual outside temperature of the bus vehicle. Detect temperature. The microcomputer 39 executes a computer program stored in advance in the ROM according to a flowchart shown in FIG. The microcomputer 38 controls the control switch 32 and the rotational speed sensor 3 during its execution.
3. In cooperation with the hydraulic switch 34, the temperature setting device 35, the inside air temperature sensor 36, and the outside air temperature sensor 37, arithmetic processing necessary for controlling the relays R1 to R4 and the stepping motor 21 is performed. In addition,
In FIG. 3, reference numeral 39 indicates a manual safety switch,
Further, each of the symbols F1 to F4 indicates a fuse. In the embodiment configured as described above, when the main operation switch 31 is closed, the main relay Rm is turned on by the electromagnetic coil.
The switch Rmb is closed by excitation of Rma, and the microcomputer 38 receives power from the DC power supply B via the switch Rmb and the fuses F1, F2, F4. Thereafter, when the occupant of the bus vehicle manually activates the air-conditioning control system from the control switch 32, that is, generates a second command signal for starting air-conditioning, the microcomputer 38 causes the computer program to execute the computer program according to the flowchart of FIG. In step 40 according to the above. Then, in step 41, first, third, and fourth excitation signals necessary for exciting the respective electromagnetic coils R1a, R3a, R4a of the respective relays R1, R3, R4 are generated. Then, the relay R1 is connected to the electromagnetic coil R1a which responds to the first excitation signal from the microcomputer 38.
Switch R1b is closed under the excitation of. Also, relay R
3 closes the switch R3b under the excitation of the electromagnetic coil R3a in response to the third excitation signal from the microcomputer 38. Further, the relay R4 closes the switch R4b under the excitation of the electromagnetic coil R4a responsive to the fourth excitation signal from the microcomputer 38. Note that this step 41 constitutes the first control means of the present invention. Then, the glow plug Pg switches the main relay 31
Rmb, through the fuses F1 and F2 and the switch R3b of the relay R3, receive power from the DC power supply B,
Pg starts preheating of auxiliary engine 10. Accordingly, the electromagnetic clutch is dissociated by the excitation of the coil CL accompanying the power supply from the DC power supply B via the switch R1b. Then, after the preheating of the auxiliary engine 10 starts, the computer program proceeds to step 42, and the microcomputer 38 moves the rotation speed control lever 11 from the fourth rotation position D to the first rotation position during the preheating of the auxiliary engine 10. A reverse drive signal for reversely rotating the stepping motor 21 is generated for a required time (for example, 7 seconds) required to rotate the motor to A. Then, in response to the reverse rotation drive signal, the stepping motor 21 reversely rotates, the plunger 22 and the connecting rod 23 are displaced rightward, and rotate the rotation speed control lever 11 toward the first rotation position A. Further, in step 43, the microcomputer 38
A forward drive signal for rotating the stepping motor 21 forward is generated for a required time (for example, 3 seconds) required to rotate the rotation speed control lever 11 from the first rotation position A to the second rotation position B. . Then, in response to the forward rotation drive signal, the stepping motor 21 rotates forward, the plunger 22 and the connecting rod 23 are displaced to the left, and the rotation speed control lever 11 is rotated toward the second rotation position B. . That is, as is apparent from FIG. 3, for example, after the auxiliary tenth engine 10 stops, when the rotation speed control lever 11 is adjusted to the start position (the second rotation position B), the main operation switch 31 is turned off. When turned off, the position of the rotation speed control lever 11 deviates from the starting position. Therefore, during the preheating of the auxiliary engine 10 as described above,
The rotation speed control lever 11 is moved to the first position where the fuel supply is stopped.
After the actuation to the rotation position A, since the adjustment to the second rotation position is performed, the auxiliary engine 10 can be started smoothly. Steps 42 and 43 constitute the second control means of the present invention. After the calculation in step 43, the microcomputer 38
However, in the next step 44, a second excitation signal necessary for exciting the electromagnetic coil R2a of the relay R2 is generated, and the timer (built-in the microcomputer 38) is reset and started. Then, the relay R2 closes the switch R2b under the excitation of the electromagnetic coil R2a responding to the second excitation signal from the microcomputer 38, and in response to this, the starter motor M
S starts by receiving power supply from the DC power supply B through the switch Rmb, the fuses F1 to F3, and the switch R2b. Note that this step 44 constitutes the third control means of the present invention. When the computer program proceeds to step 45, the microcomputer 38 calculates the rotational speed Ne of the auxiliary engine 10 according to each pulse signal from the rotational speed sensor 33, and proceeds to the next step 46. At this stage, if the rotation speed Ne is lower than 800 rpm, the microcomputer 38 determines “NO” in step 46,
In step 47, "NO" is determined based on the counted value of the timer. Here, if the determination in step 46 becomes “YES” during the repetitive arithmetic processing of each of steps 45, 46, 47, the microcomputer 38 eliminates the second and third excitation signals in step 46a. , Reset and start the timer. Then the relay R2 becomes the microcomputer 38
The switch R2b is opened by the disappearance of the electromagnetic coil R2a in response to the disappearance of the excitation signal from the switch. Further, the relay R3 opens the switch R3b by demagnetizing the electromagnetic coil R3a in response to the disappearance of the third excitation signal from the microcomputer 38. As a result, the starter motor MS is cut off from the DC power supply B and stopped, and the glow plug Pg is cut off from the DC power supply B and released from preheating. In such a state, if no pressure detection signal is generated from the hydraulic switch 34, the microcomputer 38
Is determined to be “NO” in step 48, and is determined to be “NO” in step 49 based on the count value of the timer. During the repetition determination in each of steps 48 and 49, step 48
Is "YES", the microcomputer 38 sets the air-conditioning system to the automatic air-conditioning control state in step 48a, sets the temperature setting device 35,
And the detected values of the outside air temperature sensor 37 and the rotation speed sensor 33
The stepping motor 31 is driven in response to each pulse signal from the controller, and the rotation speed of the auxiliary engine 10 is controlled by the rotation speed control lever 11 to control the air conditioning in the passenger compartment. Further, in the above-described operation, when the microcomputer 38 determines “YES” in step 47,
Based on the judgment that an abnormal situation has occurred, the first
To extinguish the fourth excitation signal. Then, each relay R1 ~
R4 opens each switch R1b to R4b by demagnetizing each of the electromagnetic coils R1a to R4a in response to the extinction of each of the first to fourth excitation signals from the microcomputer 38. As a result, the starter motor MSM is stopped, the preheating of the glow plug Pg is stopped, and the electromagnetic clutch is engaged by degaussing the coil CL. Note that the microcomputer 38 stops the execution of the computer program in the next step 47b, thereby preventing the arithmetic processing under the occurrence of the abnormal state. Further, in the operation as described above, even when the microcomputer 38 determines “YES” in step 49, based on the determination that an abnormal state has occurred, in step 49a,
A reverse drive signal for reversely rotating the stepping motor 21 is generated for a time required to rotate the rotation speed control lever 11 to the first rotation position A. Then, in response to the reverse rotation drive signal, the stepping motor 21 reversely rotates, and the plunger 22
And the connecting rod 23 is displaced to the right and the rotational speed control lever 11
Is rotated toward the first rotation position A. Note that the microcomputer 38 stops the execution of the computer program in the next step 49b to prevent the arithmetic processing under the occurrence of the abnormal state. As described above, when the system of the present invention is in the automatic control state, when the auxiliary engine 10 is started, the computer program can be executed only by operating the control switch 32 while the main operation switch 31 is closed. At this time, the starter motor MS can be automatically driven to start the auxiliary engine 10. Therefore, the auxiliary engine 10 can always be automatically started only by operating the control switch 32 without waiting for the lamp indicating the end of preheating of the auxiliary engine 10 to be turned on as in the related art. Further, in the present embodiment, as is apparent from the above description, the rotation speed adjusting member 11 is operated to be in the second rotation position B (start position of the auxiliary engine 10) during preheating of the auxiliary engine 10. The auxiliary engine 10
Can be started. In the above-described embodiment, in both steps 42 and 43, the rotation speed control lever 11 is rotated to the first rotation position A and then to the second rotation position B. Then, the rotation speed control lever 11 may be rotated to the first rotation position A, then to the fourth rotation position D, and then to the second rotation position B. In practicing the present invention, both steps 42, 43
A step of starting a timer, a step of determining whether or not the time value of the timer has elapsed 10 seconds, and a step of rotating the rotation speed control lever 11 to the second rotation position B are adopted. When it is determined that the second has elapsed, it may be determined that the rotation of the rotation speed control lever 11 to the second rotation position B is completed, and the calculation in step 44 may be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram corresponding to the configuration of the invention described in the claims, FIGS. 2 and 3 are diagrams showing the overall configuration of the system of the present invention, and FIG. It is a flowchart which shows the effect | action of a computer. DESCRIPTION OF SYMBOLS 10: auxiliary engine, 23: connecting rod 11: rotational speed control lever, 23b: universal joint 32: control switch, 20: drive mechanism 21: stepping motor, 38: microcomputer 22: plunger

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshinori Takagaki 1-1-1, Showa-cho, Kariya-shi Nippondenso Co., Ltd. (56) References JP-A-60-178258 (JP, A) (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B60H 1/32

Claims (1)

(57) [Claims] A bus vehicle air conditioning control system mounted on a bus vehicle and controlling the rotation speed of an auxiliary engine (10) composed of a diesel engine to adjust the cooling capacity and control the cooling of the passenger compartment of the bus vehicle. A) a rotation speed adjusting member (11) for adjusting the number of rotations according to the position; and a power supply from the on-board power supply (B) of the bus vehicle to electrically adjust the position of the rotation speed adjusting member (11). Electric driving means (20, 21, 22, 23), and the electric driving means (20, 21,
And a starter motor (M) for starting the auxiliary engine (10).
S) and a preheating means (Pg) for preheating the auxiliary engine (10).
An operation means (32) operated when starting cooling in the vehicle cabin; and a power supply to the air-conditioning electric device is permitted by the main switch (31).
An output signal generating means (38) for generating an output signal by the operation of 2), and the auxiliary engine (10) is controlled by the preheating means (Pg) based on the output signal generated by the output signal generating means (38). First control means (41) for starting preheating; and the auxiliary engine (10) by the first control means (41).
A second control means (42) for adjusting the position of the rotation speed adjusting member (11) to the start position of the auxiliary engine (10) by the electric drive means (20, 22, 23) during the preheating of the auxiliary engine (10).
A third control means for driving the starter motor (MS) after the rotation speed adjusting member (11) is adjusted to a start position of the auxiliary engine (10) by the second control means (42);
An air conditioning control system for a bus vehicle, comprising: a control unit (43).