JPS5863512A - Method of reducing fuel consumption for car cooler - Google Patents

Abstract

PURPOSE:To reduce fuel consumption and change in temperature of a cold wind supplied from an evaporator by operating a compressor and recovering a partial energy of car body motion when an engine brake is working while deceleration of a car. CONSTITUTION:A signal 1 detecting an engine brake and a signal 2 detecting a long downward slope enter AND circuit 3, the output of which enters OR circuit 5 along with a temperature control signal 4 of a cooler, and an output of the OR circuit 5 controls an electromagnetic clutch 6 of a compressor. In order to prevent excessive cooling in the section requiring frequent use of an engine brake on a long downward slope, in the case lacking an electronic control device the signal 2 is obtained through such a configuration of the system as consisting of, for example, a variable resistor 7 attached to an accelerator, throttle and integration circuit of a condenser 8 and discharge circuit 9 and the like. Reduction of not only fuel consumption through recovering a partial energy of car body motion but also a change in temperature of a cold wind supplied from an evaporator on a long downward slope and the like can be thus achieved.

Description

【発明の詳細な説明】 現在カークーラー及びカーエアコンのコンプレツサーは
自動車の走行状態と関係なく設定された温度条件に従っ
て作動を断続している。DETAILED DESCRIPTION OF THE INVENTION Currently, compressors for car coolers and car air conditioners operate intermittently according to set temperature conditions, regardless of the driving state of the car.

本発明は自動車の減速時でエンジンブレーキが働いてい
るときにコンプレツサーを作動させ車体の運動エネルギ
ーの一部を回生し燃費を少くし、あわせて快適性をそこ
なわぬためにエバポレーターからの冷風の温度の変動を
少くするためのものである。The present invention operates a compressor when the car is decelerating and the engine brake is working to regenerate part of the kinetic energy of the car body, thereby reducing fuel consumption.At the same time, in order to maintain comfort, cold air from the evaporator is activated. This is to reduce temperature fluctuations.

第１図においてエンジンブレーキを検出する信号１と、
長い下り坂を検出する信号２はＡＮＤ回路３に入り、Ａ
ＮＤ回路３の出力はクーラーの温度制御信号４とＯＲ回
路５に入り、ＯＲ回路５の出力はコンプレツサーの電磁
クラツチ６を制御する。In FIG. 1, a signal 1 for detecting engine braking;
Signal 2 detecting a long downhill slope enters AND circuit 3, and A
The output of the ND circuit 3 is input to the temperature control signal 4 of the cooler and the OR circuit 5, and the output of the OR circuit 5 controls the electromagnetic clutch 6 of the compressor.

ここでエンジンブレーキ時を検出するセンサーとしては
簡単には、アクセル閉、クラツチ接続、変速ギヤー接続
で電磁クラツチが作動するＡＮＤ回路を考えればよいが
、その他にも吸気マニホールド内の負圧の変化を検出す
る方法、自動変速機を持つ場合ではアクセル開度、又近
年減速時の燃料カツトなどエンジンを電子制御する方法
がとられている事からそれらの入出力を利用するなど多
種の方法がある。As a sensor for detecting engine braking, we can simply consider an AND circuit in which an electromagnetic clutch is activated when the accelerator is closed, the clutch is engaged, and the transmission gear is engaged, but there are other ways to detect changes in the negative pressure in the intake manifold. There are various methods for detecting this, such as using the accelerator opening if you have an automatic transmission, or using the input/output of electronic control of the engine, such as cutting off fuel during deceleration, since recent methods have been used to electronically control the engine.

なお長い下り坂でエンジンブレーキを多用する区間過剰
な冷却を防止するために長い下り坂を検出しなければな
らない。In addition, long downhill slopes must be detected in order to prevent excessive cooling in sections where engine braking is frequently used on long downhill slopes.

この場合手動でエンジンブレーキ信号を切ってもよいが
自動化するために長い下り坂ではエンジン出力の平均値
が小さい事を利用すればよい。In this case, the engine brake signal may be turned off manually, but in order to automate it, it is better to take advantage of the fact that the average value of the engine output is small on long downhill slopes.

すなわちエンジン出力とは関係のない数量、又は直前の
数十秒間の時間、又は数百メートルの走行距離、又はエ
ンジンが数千回転する間でのエンジンの出力又はエンジ
ンの出力にほぼ比例する吸入空気量、又は燃料供給量、
又はアクセル、スロツトルの開度、又は排気温度など積
算又は積分しその値又は関数が設定した値をこえぬ場合
長い下り坂信号２の出力を０とすればよい。In other words, the intake air is a quantity that is unrelated to the engine output, or is approximately proportional to the engine output or the engine output during the last few tens of seconds, or the distance traveled over several hundred meters, or during the several thousand revolutions of the engine. amount or amount of fuel supplied;
Alternatively, the output of the long downhill signal 2 may be set to 0 if the value or function of the accelerator, throttle opening, or exhaust temperature is integrated or integrated and does not exceed a set value.

これは電子制御を行っているエンジンについてはその入
出信号を直接利用できる。For electronically controlled engines, the input/output signals can be used directly.

また電子制御装置の無い場合も第２図のようにアクセル
、スロツトルにつけた司変抵抗７とコンデンサ８の積分
回路と放電回路９などのように簡単安価にセンサーを作
る事ができる。Furthermore, even if there is no electronic control device, a sensor can be easily and inexpensively made, such as an integrating circuit and a discharging circuit 9 consisting of a variable resistor 7 and a capacitor 8 attached to the accelerator and throttle, as shown in Fig. 2.

さらに第３図のように急加速時エンジン出力が大となる
時０となる信号１０とＡＮＤ回路１１をつければエンジ
ン負荷のピークを軽減できる。Furthermore, as shown in FIG. 3, by adding a signal 10 which becomes 0 when the engine output increases during rapid acceleration and an AND circuit 11, the peak of the engine load can be reduced.

又エンジンブレーキ時に発生した低温を液化冷媒の補充
以外に一時的に蓄熱し、その後ただちに低温を使用する
場合十数キロカロリーも蓄熱すれば十分であり敵当な凝
固温度をもつ高級アルコール、パラフィン系の蓄熱材を
エバポレーター１２にとりつけてもよい。In addition, if you temporarily store the low temperature generated during engine braking other than replenishing liquefied refrigerant, and then immediately use the low temperature, it is sufficient to store more than 10 kilocalories. A heat storage material may be attached to the evaporator 12.

しかし使用温度範囲からもエバポレーターに凝縮された
水を第４図のように通風を妨げぬように多孔質の保水材
１３により特定の所に保水しエンジンブレーキ信号の間
氷結防止回路を断ち氷結により蓄熱し、エンジンブレー
キ解除後ただちに低温を使用することもできる。However, even within the operating temperature range, the water condensed in the evaporator is retained in a specific location using a porous water retaining material 13 so as not to obstruct ventilation, as shown in Figure 4, and the anti-icing circuit is cut off during the engine brake signal to prevent icing. It stores heat and can be used at a lower temperature immediately after engine braking is released.

又この方法はクーラーを使用しない時、水は蒸発してし
まうという長所もある。Another advantage of this method is that the water evaporates when the cooler is not in use.

又第５図のように氷結による低温蓄熱を促進し、かつ吹
出し温度を過剰に冷却させぬために通風バルブ１４を作
動させバイパス風路１５を開きエバポレーターの保水部
を氷結蓄熱している時に、バイパス風路１５を通つた冷
却されていない空気を出口で混合し、吹出し空気の温度
変化を少くする事もできる。Further, as shown in Fig. 5, in order to promote low-temperature heat storage due to freezing and to prevent excessive cooling of the blowout temperature, when the ventilation valve 14 is operated and the bypass air passage 15 is opened, when the water retaining part of the evaporator is freezing and storing heat, It is also possible to mix the uncooled air that has passed through the bypass air passage 15 at the outlet to reduce temperature changes in the blown air.

これにより特に発進停止をくり返す市街地走行時のカー
クーラーの燃費を低減する事ができる。This makes it possible to reduce the fuel consumption of the car cooler, especially when driving in urban areas where the car repeatedly starts and stops.

なお以上の装置は全てとりつける必要はなく一部を使用
しても効果がある。Note that it is not necessary to install all of the above devices, and it is effective to use some of them.

【図面の簡単な説明】[Brief explanation of drawings]

第１図、第２図、第３図は回路図 第４図は斜面図、第５図は断面図 １はエンジンブレーキ信号、２は長い下り坂信号３、１
１はＡＮＤ回路、４は温度制御信号、５はＯＲ回路、６
は電磁クラッチ、７は可変抵抗、８はコンデンサー、９
は放電回路、１０は急加速信号、１２はエバポレーター
、１３は保水材、１４はバルブ、１５はバイパス風路、Figures 1, 2, and 3 are circuit diagrams, Figure 4 is a slope diagram, and Figure 5 is a cross-sectional diagram. 1 is an engine brake signal, 2 is a long downhill signal 3, 1
1 is an AND circuit, 4 is a temperature control signal, 5 is an OR circuit, 6
is an electromagnetic clutch, 7 is a variable resistor, 8 is a capacitor, 9
is a discharge circuit, 10 is a sudden acceleration signal, 12 is an evaporator, 13 is a water retaining material, 14 is a valve, 15 is a bypass air path,

Claims (4)

【特許請求の範囲】[Claims] （１）自動車のエンジンブレーキ時にカークーラーのコ
ンプレッサーを作動させ、エンジンブレーキを多用する
長い下り坂ではエンジンブレーキによるコンプレツサー
の作動を止める信号を出す事を特徴とするカークーラー
の燃費低減方法。(1) A method for reducing fuel consumption of a car cooler, which is characterized in that the compressor of the car cooler is operated during engine braking of a car, and on long downhill slopes where engine braking is frequently used, a signal is issued to stop the operation of the compressor by engine braking. （２）エンジンブレーキを多用する長い下り坂ではエン
ジンの平均出力が小さい事を利用して長い下り坂を検出
するセンサー(2) A sensor that detects long downhill slopes by taking advantage of the fact that the average output of the engine is small on long downhill slopes that require heavy use of engine braking. （３）蓄熱部をとりつけたエバポレーター。(3) Evaporator equipped with a heat storage section. （４）空気の冷却されぬバイパス風路をもつエバポレー
ター。(4) Evaporator with a bypass air passage in which the air is not cooled.